## Uses of Interface
io.vertx.core.Handler

- Packages that use Handler
  Package | Description
  --- | ---
  io.vertx.amqpbridge |
  io.vertx.camel |
  io.vertx.circuitbreaker |
  io.vertx.config |
  io.vertx.config.git |
  io.vertx.config.hocon |
  io.vertx.config.kubernetes |
  io.vertx.config.redis |
  io.vertx.config.spi |
  io.vertx.config.spi.utils |
  io.vertx.config.yaml |
  io.vertx.config.zookeeper |
  io.vertx.core |
  io.vertx.core.datagram |
  io.vertx.core.dns |
  io.vertx.core.eventbus |
  io.vertx.core.file |
  io.vertx.core.http |
  io.vertx.core.net |
  io.vertx.core.parsetools |
  io.vertx.core.shareddata |
  io.vertx.core.spi |
  io.vertx.core.spi.cluster |
  io.vertx.core.spi.resolver |
  io.vertx.core.streams |
  io.vertx.ext.auth |
  io.vertx.ext.auth.mongo |
  io.vertx.ext.auth.oauth2 |
  io.vertx.ext.cluster.infinispan |
  io.vertx.ext.consul |
  io.vertx.ext.eventbus.bridge.tcp |
  io.vertx.ext.healthchecks |
  io.vertx.ext.httpservicefactory |
  io.vertx.ext.mail |
  io.vertx.ext.mongo |
  io.vertx.ext.reactivestreams |
  io.vertx.ext.rxjava.eventbus.bridge.tcp |
  io.vertx.ext.shell |
  io.vertx.ext.shell.command |
  io.vertx.ext.shell.spi |
  io.vertx.ext.shell.system |
  io.vertx.ext.shell.term |
  io.vertx.ext.sql |
  io.vertx.ext.stomp |
  io.vertx.ext.sync |
  io.vertx.ext.unit |
  io.vertx.ext.unit.collect |
  io.vertx.ext.unit.report |
  io.vertx.ext.web |
  io.vertx.ext.web.client |
  io.vertx.ext.web.codec |
  io.vertx.ext.web.codec.spi |
  io.vertx.ext.web.handler |
  io.vertx.ext.web.handler.sockjs |
  io.vertx.ext.web.sstore |
  io.vertx.ext.web.templ |
  io.vertx.grpc |
  io.vertx.kafka.admin |
  io.vertx.kafka.client.consumer |
  io.vertx.kafka.client.producer |
  io.vertx.mqtt |
  io.vertx.rabbitmq |
  io.vertx.redis |
  io.vertx.rx.java |
  io.vertx.rxjava.amqpbridge |
  io.vertx.rxjava.circuitbreaker |
  io.vertx.rxjava.config |
  io.vertx.rxjava.core |
  io.vertx.rxjava.core.datagram |
  io.vertx.rxjava.core.dns |
  io.vertx.rxjava.core.eventbus |
  io.vertx.rxjava.core.file |
  io.vertx.rxjava.core.http |
  io.vertx.rxjava.core.net |
  io.vertx.rxjava.core.parsetools |
  io.vertx.rxjava.core.shareddata |
  io.vertx.rxjava.core.streams |
  io.vertx.rxjava.ext.auth |
  io.vertx.rxjava.ext.auth.mongo |
  io.vertx.rxjava.ext.auth.oauth2 |
  io.vertx.rxjava.ext.consul |
  io.vertx.rxjava.ext.healthchecks |
  io.vertx.rxjava.ext.mail |
  io.vertx.rxjava.ext.mongo |
  io.vertx.rxjava.ext.shell |
  io.vertx.rxjava.ext.shell.command |
  io.vertx.rxjava.ext.shell.system |
  io.vertx.rxjava.ext.shell.term |
  io.vertx.rxjava.ext.sql |
  io.vertx.rxjava.ext.stomp |
  io.vertx.rxjava.ext.unit |
  io.vertx.rxjava.ext.unit.collect |
  io.vertx.rxjava.ext.unit.report |
  io.vertx.rxjava.ext.web |
  io.vertx.rxjava.ext.web.client |
  io.vertx.rxjava.ext.web.handler |
  io.vertx.rxjava.ext.web.handler.sockjs |
  io.vertx.rxjava.ext.web.sstore |
  io.vertx.rxjava.ext.web.templ |
  io.vertx.rxjava.kafka.admin |
  io.vertx.rxjava.kafka.client.consumer |
  io.vertx.rxjava.kafka.client.producer |
  io.vertx.rxjava.mqtt |
  io.vertx.rxjava.rabbitmq |
  io.vertx.rxjava.redis |
  io.vertx.rxjava.servicediscovery |
  io.vertx.rxjava.servicediscovery.spi |
  io.vertx.rxjava.servicediscovery.types |
  io.vertx.servicediscovery |
  io.vertx.servicediscovery.backend.redis |
  io.vertx.servicediscovery.consul |
  io.vertx.servicediscovery.docker |
  io.vertx.servicediscovery.kubernetes |
  io.vertx.servicediscovery.spi |
  io.vertx.servicediscovery.types |
  io.vertx.serviceproxy |
  io.vertx.spi.cluster.hazelcast |
  io.vertx.spi.cluster.ignite |
  io.vertx.spi.cluster.zookeeper |

- - ### Uses of Handler in io.vertx.amqpbridge

    Methods in io.vertx.amqpbridge with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AmqpBridge.`close(Handler<AsyncResult<Void>> resultHandler)` Shuts the bridge down, closing the underlying connection.
    `void` | AmqpBridge.`endHandler(Handler<Void> endHandler)` Set an end handler.
    `void` | AmqpBridge.`start(String hostname, int port, Handler<AsyncResult<AmqpBridge>> resultHandler)` Starts the bridge, establishing the underlying connection.
    `void` | AmqpBridge.`start(String hostname, int port, String username, String password, Handler<AsyncResult<AmqpBridge>> resultHandler)` Starts the bridge, establishing the underlying connection.

  - ### Uses of Handler in io.vertx.camel

    Methods in io.vertx.camel with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `CamelBridge` | CamelBridge.`start(Handler<AsyncResult<Void>> completed)` Starts the bridge.
    `CamelBridge` | CamelBridge.`stop(Handler<AsyncResult<Void>> completed)` Stops the bridge.

  - ### Uses of Handler in io.vertx.circuitbreaker

    Subinterfaces of Handler in io.vertx.circuitbreaker
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `HystrixMetricHandler` A Vert.x web handler to expose the circuit breaker to the Hystrix dasbboard.

    Methods in io.vertx.circuitbreaker with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `CircuitBreaker` | CircuitBreaker.`closeHandler(Handler<Void> handler)` Sets a `Handler` invoked when the circuit breaker state switches to close.
    `<T> Future<T>` | CircuitBreaker.`execute(Handler<Future<T>> command)` Same as `CircuitBreaker.executeWithFallback(Handler, Function)` but using the circuit breaker default fallback.
    `<T> CircuitBreaker` | CircuitBreaker.`executeAndReport(Future<T> resultFuture, Handler<Future<T>> command)` Same as `CircuitBreaker.executeAndReportWithFallback(Future, Handler, Function)` but using the circuit breaker default fallback.
    `<T> CircuitBreaker` | CircuitBreaker.`executeAndReportWithFallback(Future<T> resultFuture, Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback)` Executes the given operation with the circuit breaker control.
    `default <T> void` | CircuitBreaker.`executeCommand(Handler<Future<T>> command, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(Handler, Function)` but using the circuit breaker default fallback.
    `default <T> void` | CircuitBreaker.`executeCommand(Handler<Future<T>> command, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(Handler, Function)` but using the circuit breaker default fallback.
    `default <T> void` | CircuitBreaker.`executeCommandWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(Handler, Function)` but using a callback.
    `default <T> void` | CircuitBreaker.`executeCommandWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(Handler, Function)` but using a callback.
    `<T> Future<T>` | CircuitBreaker.`executeWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback)` Executes the given operation with the circuit breaker control.
    `CircuitBreaker` | CircuitBreaker.`halfOpenHandler(Handler<Void> handler)` Sets a `Handler` invoked when the circuit breaker state switches to half-open.
    `CircuitBreaker` | CircuitBreaker.`openHandler(Handler<Void> handler)` Sets a `Handler` invoked when the circuit breaker state switches to open.

  - ### Uses of Handler in io.vertx.config

    Methods in io.vertx.config with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ConfigRetriever.`getConfig(Handler<AsyncResult<JsonObject>> completionHandler)` Reads the configuration from the different `ConfigStore` and computes the final configuration.
    `void` | ConfigRetriever.`listen(Handler<ConfigChange> listener)` Registers a listener receiving configuration changes.

  - ### Uses of Handler in io.vertx.config.git

    Methods in io.vertx.config.git with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | GitConfigStore.`close(Handler<Void> completionHandler)`
    `void` | GitConfigStore.`get(Handler<AsyncResult<Buffer>> completionHandler)`

  - ### Uses of Handler in io.vertx.config.hocon

    Methods in io.vertx.config.hocon with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | HoconProcessor.`process(Vertx vertx, JsonObject configuration, Buffer input, Handler<AsyncResult<JsonObject>> handler)`

  - ### Uses of Handler in io.vertx.config.kubernetes

    Methods in io.vertx.config.kubernetes with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ConfigMapStore.`close(Handler<Void> completionHandler)`
    `void` | ConfigMapStore.`get(Handler<AsyncResult<Buffer>> completionHandler)`

  - ### Uses of Handler in io.vertx.config.redis

    Methods in io.vertx.config.redis with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | RedisConfigStore.`close(Handler<Void> completionHandler)`
    `void` | RedisConfigStore.`get(Handler<AsyncResult<Buffer>> completionHandler)`

  - ### Uses of Handler in io.vertx.config.spi

    Methods in io.vertx.config.spi with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `default void` | ConfigStore.`close(Handler<Void> completionHandler)` Closes the configuration store.
    `void` | ConfigStore.`get(Handler<AsyncResult<Buffer>> completionHandler)` Retrieves the configuration store in this store.
    `void` | ConfigProcessor.`process(Vertx vertx, JsonObject configuration, Buffer input, Handler<AsyncResult<JsonObject>> handler)` Transforms the given `input` into a `JsonObject`.

  - ### Uses of Handler in io.vertx.config.spi.utils

    Methods in io.vertx.config.spi.utils with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | FileSet.`buildConfiguration(List<File> files, Handler<AsyncResult<JsonObject>> handler)` Iterates over the given set of files, and for each matching file, computes the resulting configuration.

  - ### Uses of Handler in io.vertx.config.yaml

    Methods in io.vertx.config.yaml with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | YamlProcessor.`process(Vertx vertx, JsonObject configuration, Buffer input, Handler<AsyncResult<JsonObject>> handler)`

  - ### Uses of Handler in io.vertx.config.zookeeper

    Methods in io.vertx.config.zookeeper with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ZookeeperConfigStore.`close(Handler<Void> completionHandler)`
    `void` | ZookeeperConfigStore.`get(Handler<AsyncResult<Buffer>> completionHandler)`

  - ### Uses of Handler in io.vertx.core

    Subinterfaces of Handler in io.vertx.core
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `CompositeFuture` The composite future wraps a list of `futures`, it is useful when several futures needs to be coordinated.
    `interface` | `Future<T>` Represents the result of an action that may, or may not, have occurred yet.

    Methods in io.vertx.core that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `default Handler<AsyncResult<T>>` | Future.`completer()`
    `Handler<Throwable>` | Context.`exceptionHandler()`
    `Handler<Throwable>` | Vertx.`exceptionHandler()`

    Methods in io.vertx.core with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | Closeable.`close(Handler<AsyncResult<Void>> completionHandler)`
    `void` | Vertx.`close(Handler<AsyncResult<Void>> completionHandler)` Like `Vertx.close()` but the completionHandler will be called when the close is complete
    `static void` | Vertx.`clusteredVertx(VertxOptions options, Handler<AsyncResult<Vertx>> resultHandler)` Creates a clustered instance using the specified options.
    `default <U> Future<U>` | Future.`compose(Handler<T> handler, Future<U> next)` Compose this future with a provided `next` future.
    `void` | Vertx.`deployVerticle(String name, DeploymentOptions options, Handler<AsyncResult<String>> completionHandler)` Like `Vertx.deployVerticle(String, Handler)` but `DeploymentOptions` are provided to configure the deployment.
    `void` | Vertx.`deployVerticle(String name, Handler<AsyncResult<String>> completionHandler)` Like `Vertx.deployVerticle(String)` but the completionHandler will be notified when the deployment is complete.
    `void` | Vertx.`deployVerticle(Verticle verticle, DeploymentOptions options, Handler<AsyncResult<String>> completionHandler)` Like `Vertx.deployVerticle(Verticle, Handler)` but `DeploymentOptions` are provided to configure the deployment.
    `void` | Vertx.`deployVerticle(Verticle verticle, Handler<AsyncResult<String>> completionHandler)` Like `Vertx.deployVerticle(Verticle)` but the completionHandler will be notified when the deployment is complete.
    `TimeoutStream` | TimeoutStream.`endHandler(Handler<Void> endHandler)`
    `Context` | Context.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler called when the context runs an action throwing an uncaught throwable. When this handler is called, `Vertx.currentContext()` will return this context.
    `TimeoutStream` | TimeoutStream.`exceptionHandler(Handler<Throwable> handler)`
    `Vertx` | Vertx.`exceptionHandler(Handler<Throwable> handler)` Set a default exception handler for `Context`, set on `Context.exceptionHandler(Handler)` at creation.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Invoke `Context.executeBlocking(Handler, boolean, Handler)` with order = true.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Invoke `Context.executeBlocking(Handler, boolean, Handler)` with order = true.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `Vertx.executeBlocking(Handler, boolean, Handler)` called with ordered = true.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `Vertx.executeBlocking(Handler, boolean, Handler)` called with ordered = true.
    `default <T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `WorkerExecutor.executeBlocking(Handler, boolean, Handler)` called with ordered = true.
    `default <T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `WorkerExecutor.executeBlocking(Handler, boolean, Handler)` called with ordered = true.
    `static <T> Future<T>` | Future.`future(Handler<Future<T>> handler)` Create a future that hasn't completed yet and that is passed to the `handler` before it is returned.
    `TimeoutStream` | TimeoutStream.`handler(Handler<Long> handler)`
    `void` | Context.`runOnContext(Handler<Void> action)` Run the specified action asynchronously on the same context, some time after the current execution has completed.
    `void` | Vertx.`runOnContext(Handler<Void> action)` Puts the handler on the event queue for the current context so it will be run asynchronously ASAP after all preceeding events have been handled.
    `CompositeFuture` | CompositeFuture.`setHandler(Handler<AsyncResult<CompositeFuture>> handler)`
    `Future<T>` | Future.`setHandler(Handler<AsyncResult<T>> handler)` Set a handler for the result.
    `long` | Vertx.`setPeriodic(long delay, Handler<Long> handler)` Set a periodic timer to fire every `delay` milliseconds, at which point `handler` will be called with the id of the timer.
    `long` | Vertx.`setTimer(long delay, Handler<Long> handler)` Set a one-shot timer to fire after `delay` milliseconds, at which point `handler` will be called with the id of the timer.
    `void` | Vertx.`undeploy(String deploymentID, Handler<AsyncResult<Void>> completionHandler)` Like `Vertx.undeploy(String)` but the completionHandler will be notified when the undeployment is complete.

  - ### Uses of Handler in io.vertx.core.datagram

    Methods in io.vertx.core.datagram with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `DatagramSocket` | DatagramSocket.`blockMulticastGroup(String multicastAddress, String sourceToBlock, Handler<AsyncResult<DatagramSocket>> handler)` Block the given address for the given multicast address and notifies the `Handler` once the operation completes.
    `DatagramSocket` | DatagramSocket.`blockMulticastGroup(String multicastAddress, String networkInterface, String sourceToBlock, Handler<AsyncResult<DatagramSocket>> handler)` Block the given address for the given multicast address on the given network interface and notifies the `Handler` once the operation completes.
    `void` | DatagramSocket.`close(Handler<AsyncResult<Void>> handler)` Closes the `DatagramSocket` implementation asynchronous and notifies the handler once done.
    `DatagramSocket` | DatagramSocket.`endHandler(Handler<Void> endHandler)`
    `DatagramSocket` | DatagramSocket.`exceptionHandler(Handler<Throwable> handler)`
    `DatagramSocket` | DatagramSocket.`handler(Handler<DatagramPacket> handler)`
    `DatagramSocket` | DatagramSocket.`listen(int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Start listening on the given port and host.
    `DatagramSocket` | DatagramSocket.`listenMulticastGroup(String multicastAddress, Handler<AsyncResult<DatagramSocket>> handler)` Joins a multicast group and listens for packets send to it.
    `DatagramSocket` | DatagramSocket.`listenMulticastGroup(String multicastAddress, String networkInterface, String source, Handler<AsyncResult<DatagramSocket>> handler)` Joins a multicast group and listens for packets send to it on the given network interface.
    `DatagramSocket` | DatagramSocket.`send(Buffer packet, int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Write the given `Buffer` to the `SocketAddress`.
    `DatagramSocket` | DatagramSocket.`send(String str, int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Write the given `String` to the `SocketAddress` using UTF8 encoding.
    `DatagramSocket` | DatagramSocket.`send(String str, String enc, int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Write the given `String` to the `SocketAddress` using the given encoding.
    `DatagramSocket` | DatagramSocket.`unlistenMulticastGroup(String multicastAddress, Handler<AsyncResult<DatagramSocket>> handler)` Leaves a multicast group and stops listening for packets send to it.
    `DatagramSocket` | DatagramSocket.`unlistenMulticastGroup(String multicastAddress, String networkInterface, String source, Handler<AsyncResult<DatagramSocket>> handler)` Leaves a multicast group and stops listening for packets send to it on the given network interface.

  - ### Uses of Handler in io.vertx.core.dns

    Methods in io.vertx.core.dns with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `DnsClient` | DnsClient.`lookup(String name, Handler<AsyncResult<String>> handler)` Try to lookup the A (ipv4) or AAAA (ipv6) record for the given name.
    `DnsClient` | DnsClient.`lookup4(String name, Handler<AsyncResult<String>> handler)` Try to lookup the A (ipv4) record for the given name.
    `DnsClient` | DnsClient.`lookup6(String name, Handler<AsyncResult<String>> handler)` Try to lookup the AAAA (ipv6) record for the given name.
    `DnsClient` | DnsClient.`resolveA(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve all A (ipv4) records for the given name.
    `DnsClient` | DnsClient.`resolveAAAA(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve all AAAA (ipv6) records for the given name.
    `DnsClient` | DnsClient.`resolveCNAME(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve the CNAME record for the given name.
    `DnsClient` | DnsClient.`resolveMX(String name, Handler<AsyncResult<List<MxRecord>>> handler)` Try to resolve the MX records for the given name.
    `DnsClient` | DnsClient.`resolveNS(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve the NS records for the given name.
    `DnsClient` | DnsClient.`resolvePTR(String name, Handler<AsyncResult<String>> handler)` Try to resolve the PTR record for the given name.
    `DnsClient` | DnsClient.`resolveSRV(String name, Handler<AsyncResult<List<SrvRecord>>> handler)` Try to resolve the SRV records for the given name.
    `DnsClient` | DnsClient.`resolveTXT(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve the TXT records for the given name.
    `DnsClient` | DnsClient.`reverseLookup(String ipaddress, Handler<AsyncResult<String>> handler)` Try to do a reverse lookup of an IP address.

  - ### Uses of Handler in io.vertx.core.eventbus

    Classes in io.vertx.core.eventbus that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `BridgeInterceptor`
    `class` | `FilteringInterceptor`

    Methods in io.vertx.core.eventbus with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `EventBus` | EventBus.`addInterceptor(Handler<SendContext> interceptor)` Add an interceptor that will be called whenever a message is sent from Vert.x
    `void` | EventBus.`close(Handler<AsyncResult<Void>> completionHandler)` Close the event bus and release any resources held.
    `void` | MessageConsumer.`completionHandler(Handler<AsyncResult<Void>> completionHandler)` Optional method which can be called to indicate when the registration has been propagated across the cluster.
    `<T> MessageConsumer<T>` | EventBus.`consumer(String address, Handler<Message<T>> handler)` Create a consumer and register it against the specified address.
    `MessageProducer<T>` | MessageProducer.`drainHandler(Handler<Void> handler)`
    `MessageConsumer<T>` | MessageConsumer.`endHandler(Handler<Void> endHandler)`
    `MessageConsumer<T>` | MessageConsumer.`exceptionHandler(Handler<Throwable> handler)`
    `MessageProducer<T>` | MessageProducer.`exceptionHandler(Handler<Throwable> handler)`
    `MessageConsumer<T>` | MessageConsumer.`handler(Handler<Message<T>> handler)`
    `<T> MessageConsumer<T>` | EventBus.`localConsumer(String address, Handler<Message<T>> handler)` Like `EventBus.consumer(String, Handler)` but the address won't be propagated across the cluster.
    `EventBus` | EventBus.`removeInterceptor(Handler<SendContext> interceptor)` Remove an interceptor
    `<R> void` | Message.`reply(Object message, DeliveryOptions options, Handler<AsyncResult<Message<R>>> replyHandler)` The same as `reply(R message, DeliveryOptions)` but you can specify handler for the reply - i.e.
    `<R> void` | Message.`reply(Object message, Handler<AsyncResult<Message<R>>> replyHandler)` The same as `reply(R message)` but you can specify handler for the reply - i.e.
    `<T> EventBus` | EventBus.`send(String address, Object message, DeliveryOptions options, Handler<AsyncResult<Message<T>>> replyHandler)` Like `EventBus.send(String, Object, DeliveryOptions)` but specifying a `replyHandler` that will be called if the recipient subsequently replies to the message.
    `<T> EventBus` | EventBus.`send(String address, Object message, Handler<AsyncResult<Message<T>>> replyHandler)` Like `EventBus.send(String, Object)` but specifying a `replyHandler` that will be called if the recipient subsequently replies to the message.
    `<R> MessageProducer<T>` | MessageProducer.`send(T message, Handler<AsyncResult<Message<R>>> replyHandler)`
    `void` | EventBus.`start(Handler<AsyncResult<Void>> completionHandler)` Start the event bus.
    `void` | MessageConsumer.`unregister(Handler<AsyncResult<Void>> completionHandler)` Unregisters the handler which created this registration

  - ### Uses of Handler in io.vertx.core.file

    Methods in io.vertx.core.file with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `FileSystem` | FileSystem.`chmod(String path, String perms, Handler<AsyncResult<Void>> handler)` Change the permissions on the file represented by `path` to `perms`, asynchronously.
    `FileSystem` | FileSystem.`chmodRecursive(String path, String perms, String dirPerms, Handler<AsyncResult<Void>> handler)` Change the permissions on the file represented by `path` to `perms`, asynchronously.
    `FileSystem` | FileSystem.`chown(String path, String user, String group, Handler<AsyncResult<Void>> handler)` Change the ownership on the file represented by `path` to `user` and {code group}, asynchronously.
    `void` | AsyncFile.`close(Handler<AsyncResult<Void>> handler)` Close the file.
    `FileSystem` | FileSystem.`copy(String from, String to, Handler<AsyncResult<Void>> handler)` Copy a file from the path `from` to path `to`, asynchronously.
    `FileSystem` | FileSystem.`copyRecursive(String from, String to, boolean recursive, Handler<AsyncResult<Void>> handler)` Copy a file from the path `from` to path `to`, asynchronously.
    `FileSystem` | FileSystem.`createFile(String path, Handler<AsyncResult<Void>> handler)` Creates an empty file with the specified `path`, asynchronously.
    `FileSystem` | FileSystem.`createFile(String path, String perms, Handler<AsyncResult<Void>> handler)` Creates an empty file with the specified `path` and permissions `perms`, asynchronously.
    `FileSystem` | FileSystem.`delete(String path, Handler<AsyncResult<Void>> handler)` Deletes the file represented by the specified `path`, asynchronously.
    `FileSystem` | FileSystem.`deleteRecursive(String path, boolean recursive, Handler<AsyncResult<Void>> handler)` Deletes the file represented by the specified `path`, asynchronously.
    `AsyncFile` | AsyncFile.`drainHandler(Handler<Void> handler)`
    `AsyncFile` | AsyncFile.`endHandler(Handler<Void> endHandler)`
    `AsyncFile` | AsyncFile.`exceptionHandler(Handler<Throwable> handler)`
    `FileSystem` | FileSystem.`exists(String path, Handler<AsyncResult<Boolean>> handler)` Determines whether the file as specified by the path `path` exists, asynchronously.
    `AsyncFile` | AsyncFile.`flush(Handler<AsyncResult<Void>> handler)` Same as `AsyncFile.flush()` but the handler will be called when the flush is complete or if an error occurs
    `FileSystem` | FileSystem.`fsProps(String path, Handler<AsyncResult<FileSystemProps>> handler)` Returns properties of the file-system being used by the specified `path`, asynchronously.
    `AsyncFile` | AsyncFile.`handler(Handler<Buffer> handler)`
    `FileSystem` | FileSystem.`link(String link, String existing, Handler<AsyncResult<Void>> handler)` Create a hard link on the file system from `link` to `existing`, asynchronously.
    `FileSystem` | FileSystem.`lprops(String path, Handler<AsyncResult<FileProps>> handler)` Obtain properties for the link represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`mkdir(String path, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`mkdir(String path, String perms, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`mkdirs(String path, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path` and any non existent parents, asynchronously.
    `FileSystem` | FileSystem.`mkdirs(String path, String perms, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path` and any non existent parents, asynchronously.
    `FileSystem` | FileSystem.`move(String from, String to, Handler<AsyncResult<Void>> handler)` Move a file from the path `from` to path `to`, asynchronously.
    `FileSystem` | FileSystem.`open(String path, OpenOptions options, Handler<AsyncResult<AsyncFile>> handler)` Open the file represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`props(String path, Handler<AsyncResult<FileProps>> handler)` Obtain properties for the file represented by `path`, asynchronously.
    `AsyncFile` | AsyncFile.`read(Buffer buffer, int offset, long position, int length, Handler<AsyncResult<Buffer>> handler)` Reads `length` bytes of data from the file at position `position` in the file, asynchronously.
    `FileSystem` | FileSystem.`readDir(String path, Handler<AsyncResult<List<String>>> handler)` Read the contents of the directory specified by `path`, asynchronously.
    `FileSystem` | FileSystem.`readDir(String path, String filter, Handler<AsyncResult<List<String>>> handler)` Read the contents of the directory specified by `path`, asynchronously.
    `FileSystem` | FileSystem.`readFile(String path, Handler<AsyncResult<Buffer>> handler)` Reads the entire file as represented by the path `path` as a `Buffer`, asynchronously.
    `FileSystem` | FileSystem.`readSymlink(String link, Handler<AsyncResult<String>> handler)` Returns the path representing the file that the symbolic link specified by `link` points to, asynchronously.
    `FileSystem` | FileSystem.`symlink(String link, String existing, Handler<AsyncResult<Void>> handler)` Create a symbolic link on the file system from `link` to `existing`, asynchronously.
    `FileSystem` | FileSystem.`truncate(String path, long len, Handler<AsyncResult<Void>> handler)` Truncate the file represented by `path` to length `len` in bytes, asynchronously.
    `FileSystem` | FileSystem.`unlink(String link, Handler<AsyncResult<Void>> handler)` Unlinks the link on the file system represented by the path `link`, asynchronously.
    `AsyncFile` | AsyncFile.`write(Buffer buffer, long position, Handler<AsyncResult<Void>> handler)` Write a `Buffer` to the file at position `position` in the file, asynchronously.
    `FileSystem` | FileSystem.`writeFile(String path, Buffer data, Handler<AsyncResult<Void>> handler)` Creates the file, and writes the specified `Buffer data` to the file represented by the path `path`, asynchronously.

  - ### Uses of Handler in io.vertx.core.http

    Methods in io.vertx.core.http that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<HttpServerRequest>` | HttpServer.`requestHandler()`
    `Handler<ServerWebSocket>` | HttpServer.`websocketHandler()`

    Methods in io.vertx.core.http with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `WebSocketBase` | WebSocketBase.`binaryMessageHandler(Handler<Buffer> handler)` Set a binary message handler on the connection.
    `HttpServerResponse` | HttpServerResponse.`bodyEndHandler(Handler<Void> handler)` Provides a handler that will be called after the last part of the body is written to the wire.
    `HttpClientResponse` | HttpClientResponse.`bodyHandler(Handler<Buffer> bodyHandler)` Convenience method for receiving the entire request body in one piece.
    `default HttpServerRequest` | HttpServerRequest.`bodyHandler(Handler<Buffer> bodyHandler)` Convenience method for receiving the entire request body in one piece.
    `void` | HttpServer.`close(Handler<AsyncResult<Void>> completionHandler)` Like `HttpServer.close()` but supplying a handler that will be called when the server is actually closed (or has failed).
    `HttpConnection` | HttpConnection.`closeHandler(Handler<Void> handler)` Set a close handler.
    `HttpServerResponse` | HttpServerResponse.`closeHandler(Handler<Void> handler)` Set a close handler for the response, this is called when the underlying connection is closed and the response was still using the connection.
    `ServerWebSocket` | ServerWebSocket.`closeHandler(Handler<Void> handler)`
    `WebSocket` | WebSocket.`closeHandler(Handler<Void> handler)`
    `WebSocketBase` | WebSocketBase.`closeHandler(Handler<Void> handler)` Set a close handler.
    `HttpClientRequest` | HttpClientRequest.`connectionHandler(Handler<HttpConnection> handler)` Set a connection handler called when an HTTP connection has been established.
    `HttpServer` | HttpServer.`connectionHandler(Handler<HttpConnection> handler)` Set a connection handler for the server.
    `HttpClientRequest` | HttpClientRequest.`continueHandler(Handler<Void> handler)` If you send an HTTP request with the header `Expect` set to the value `100-continue` and the server responds with an interim HTTP response with a status code of `100` and a continue handler has been set using this method, then the `handler` will be called.
    `HttpClientResponse` | HttpClientResponse.`customFrameHandler(Handler<HttpFrame> handler)` Set an custom frame handler.
    `HttpServerRequest` | HttpServerRequest.`customFrameHandler(Handler<HttpFrame> handler)` Set a custom frame handler.
    `HttpClientRequest` | HttpClient.`delete(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`delete(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`delete(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`delete(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`deleteAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClientRequest.`drainHandler(Handler<Void> handler)`
    `HttpServerResponse` | HttpServerResponse.`drainHandler(Handler<Void> handler)`
    `ServerWebSocket` | ServerWebSocket.`drainHandler(Handler<Void> handler)`
    `WebSocket` | WebSocket.`drainHandler(Handler<Void> handler)`
    `WebSocketBase` | WebSocketBase.`drainHandler(Handler<Void> handler)`
    `HttpClientRequest` | HttpClientRequest.`endHandler(Handler<Void> endHandler)`
    `HttpClientResponse` | HttpClientResponse.`endHandler(Handler<Void> endHandler)`
    `HttpServerFileUpload` | HttpServerFileUpload.`endHandler(Handler<Void> endHandler)`
    `HttpServerRequest` | HttpServerRequest.`endHandler(Handler<Void> endHandler)`
    `HttpServerResponse` | HttpServerResponse.`endHandler(Handler<Void> handler)` Set an end handler for the response.
    `ServerWebSocket` | ServerWebSocket.`endHandler(Handler<Void> endHandler)`
    `WebSocket` | WebSocket.`endHandler(Handler<Void> endHandler)`
    `WebSocketBase` | WebSocketBase.`endHandler(Handler<Void> endHandler)`
    `HttpClientRequest` | HttpClientRequest.`exceptionHandler(Handler<Throwable> handler)`
    `HttpClientResponse` | HttpClientResponse.`exceptionHandler(Handler<Throwable> handler)`
    `HttpConnection` | HttpConnection.`exceptionHandler(Handler<Throwable> handler)` Set an handler called when a connection error happens
    `HttpServerFileUpload` | HttpServerFileUpload.`exceptionHandler(Handler<Throwable> handler)`
    `HttpServerRequest` | HttpServerRequest.`exceptionHandler(Handler<Throwable> handler)`
    `HttpServerResponse` | HttpServerResponse.`exceptionHandler(Handler<Throwable> handler)`
    `ServerWebSocket` | ServerWebSocket.`exceptionHandler(Handler<Throwable> handler)`
    `WebSocket` | WebSocket.`exceptionHandler(Handler<Throwable> handler)`
    `WebSocketBase` | WebSocketBase.`exceptionHandler(Handler<Throwable> handler)`
    `ServerWebSocket` | ServerWebSocket.`frameHandler(Handler<WebSocketFrame> handler)`
    `WebSocket` | WebSocket.`frameHandler(Handler<WebSocketFrame> handler)`
    `WebSocketBase` | WebSocketBase.`frameHandler(Handler<WebSocketFrame> handler)` Set a frame handler on the connection.
    `HttpClientRequest` | HttpClient.`get(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`get(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`get(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`get(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`getAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server with the specified options, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server at the default host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpConnection` | HttpConnection.`goAwayHandler(Handler<GoAway> handler)` Set an handler called when a GOAWAY frame is received.
    `HttpClientResponse` | HttpClientResponse.`handler(Handler<Buffer> handler)`
    `HttpServerFileUpload` | HttpServerFileUpload.`handler(Handler<Buffer> handler)`
    `HttpServerRequest` | HttpServerRequest.`handler(Handler<Buffer> handler)`
    `ServerWebSocket` | ServerWebSocket.`handler(Handler<Buffer> handler)`
    `WebSocket` | WebSocket.`handler(Handler<Buffer> handler)`
    `WebSocketBase` | WebSocketBase.`handler(Handler<Buffer> handler)`
    `HttpClientRequest` | HttpClientRequest.`handler(Handler<HttpClientResponse> handler)`
    `HttpClientRequest` | HttpClient.`head(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`head(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`head(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`head(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`headAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpServerResponse` | HttpServerResponse.`headersEndHandler(Handler<Void> handler)` Provide a handler that will be called just before the headers are written to the wire.
    `HttpClient` | HttpClient.`headNow(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`headNow(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server with the specified options, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`headNow(String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server at the default host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`headNow(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpServer` | HttpServer.`listen(Handler<AsyncResult<HttpServer>> listenHandler)` Like `HttpServer.listen()` but supplying a handler that will be called when the server is actually listening (or has failed).
    `HttpServer` | HttpServer.`listen(int port, Handler<AsyncResult<HttpServer>> listenHandler)` Like `HttpServer.listen(int)` but supplying a handler that will be called when the server is actually listening (or has failed).
    `HttpServer` | HttpServer.`listen(int port, String host, Handler<AsyncResult<HttpServer>> listenHandler)` Like `HttpServer.listen(int, String)` but supplying a handler that will be called when the server is actually listening (or has failed).
    `HttpClientRequest` | HttpClient.`options(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`options(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`options(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`options(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`optionsAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server with the specified options, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server at the default host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpConnection` | HttpConnection.`ping(Buffer data, Handler<AsyncResult<Buffer>> pongHandler)` Send a PING frame to the remote endpoint.
    `HttpConnection` | HttpConnection.`pingHandler(Handler<Buffer> handler)` Set an handler notified when a PING frame is received from the remote endpoint.
    `HttpClientRequest` | HttpClient.`post(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`post(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`post(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`post(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`postAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String path, Handler<AsyncResult<HttpServerResponse>> handler)` Like `HttpServerResponse.push(HttpMethod, String, String, MultiMap, Handler)` with the host copied from the current request.
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String path, MultiMap headers, Handler<AsyncResult<HttpServerResponse>> handler)` Like `HttpServerResponse.push(HttpMethod, String, String, MultiMap, Handler)` with the host copied from the current request.
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String host, String path, Handler<AsyncResult<HttpServerResponse>> handler)` Like `HttpServerResponse.push(HttpMethod, String, String, MultiMap, Handler)` with no headers.
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String host, String path, MultiMap headers, Handler<AsyncResult<HttpServerResponse>> handler)` Push a response to the client. The `handler` will be notified with a success when the push can be sent and with a failure when the client has disabled push or reset the push before it has been sent. The `handler` may be queued if the client has reduced the maximum number of streams the server can push concurrently. Push can be sent only for peer initiated streams and if the response is not ended.
    `HttpClientRequest` | HttpClientRequest.`pushHandler(Handler<HttpClientRequest> handler)` Set a push handler for this request. The handler is called when the client receives a push promise from the server.
    `HttpClientRequest` | HttpClient.`put(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`put(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`put(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`put(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`putAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpConnection` | HttpConnection.`remoteSettingsHandler(Handler<Http2Settings> handler)` Set an handler that is called when remote endpoint `Http2Settings` are updated.
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server with the specified options, specifying a response handler to receive
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`requestAbs(HttpMethod method, String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpServer` | HttpServer.`requestHandler(Handler<HttpServerRequest> handler)` Set the request handler for the server to `requestHandler`.
    `default HttpServerResponse` | HttpServerResponse.`sendFile(String filename, Handler<AsyncResult<Void>> resultHandler)` Like `HttpServerResponse.sendFile(String)` but providing a handler which will be notified once the file has been completely written to the wire.
    `default HttpServerResponse` | HttpServerResponse.`sendFile(String filename, long offset, Handler<AsyncResult<Void>> resultHandler)` Like `HttpServerResponse.sendFile(String, long)` but providing a handler which will be notified once the file has been completely written to the wire.
    `HttpServerResponse` | HttpServerResponse.`sendFile(String filename, long offset, long length, Handler<AsyncResult<Void>> resultHandler)` Like `HttpServerResponse.sendFile(String, long, long)` but providing a handler which will be notified once the file has been completely written to the wire.
    `HttpClientRequest` | HttpClientRequest.`sendHead(Handler<HttpVersion> completionHandler)` Like `HttpClientRequest.sendHead()` but with an handler after headers have been sent.
    `HttpConnection` | HttpConnection.`shutdownHandler(Handler<Void> handler)` Set an handler called when a GOAWAY frame has been sent or received and all connections are closed.
    `WebSocketBase` | WebSocketBase.`textMessageHandler(Handler<String> handler)` Set a text message handler on the connection.
    `HttpConnection` | HttpConnection.`updateSettings(Http2Settings settings, Handler<AsyncResult<Void>> completionHandler)` Send to the remote endpoint an update of this endpoint settings The `completionHandler` will be notified when the remote endpoint has acknowledged the settings.
    `HttpServerRequest` | HttpServerRequest.`uploadHandler(Handler<HttpServerFileUpload> uploadHandler)` Set an upload handler.
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI, and with the specified headers
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, and with the specified headers
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, and with the specified headers
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(RequestOptions options, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified options
    `HttpClient` | HttpClient.`websocket(RequestOptions options, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options
    `HttpClient` | HttpClient.`websocket(RequestOptions options, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified options, and with the specified headers
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, and with the specified headers
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, and with the specified headers
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified optionsI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified options, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(String requestURI, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port
    `HttpClient` | HttpClient.`websocket(String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port
    `HttpClient` | HttpClient.`websocket(String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port and the specified headers
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port and the specified headers
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port and the specified headers
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers and the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers and the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers and the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers, the specified version of WebSockets and the specified sub protocols
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers, the specified version of WebSockets and the specified sub protocols
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers, the specified version of WebSockets and the specified sub protocols
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, Handler<WebSocket> wsConnect)` Connect a WebSocket to the host and relative request URI and default port
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the host and relative request URI and default port
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the host and relative request URI and default port
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified host,relative request UR, and default port and with the specified headers
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host,relative request UR, and default port and with the specified headers
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host,relative request UR, and default port and with the specified headers
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified host, relative request URI and default port with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified host, relative request URI and default port, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpServer` | HttpServer.`websocketHandler(Handler<ServerWebSocket> handler)` Set the websocket handler for the server to `wsHandler`.

  - ### Uses of Handler in io.vertx.core.net

    Methods in io.vertx.core.net that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<NetSocket>` | NetServer.`connectHandler()`

    Methods in io.vertx.core.net with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | NetServer.`close(Handler<AsyncResult<Void>> completionHandler)` Like `NetServer.close()` but supplying a handler that will be notified when close is complete.
    `NetSocket` | NetSocket.`closeHandler(Handler<Void> handler)` Set a handler that will be called when the NetSocket is closed
    `NetClient` | NetClient.`connect(int port, String host, Handler<AsyncResult<NetSocket>> connectHandler)` Open a connection to a server at the specific `port` and `host`.
    `NetClient` | NetClient.`connect(int port, String host, String serverName, Handler<AsyncResult<NetSocket>> connectHandler)` Open a connection to a server at the specific `port` and `host`.
    `NetServer` | NetServer.`connectHandler(Handler<NetSocket> handler)` Supply a connect handler for this server.
    `NetSocket` | NetSocket.`drainHandler(Handler<Void> handler)`
    `NetSocket` | NetSocket.`endHandler(Handler<Void> endHandler)`
    `NetSocket` | NetSocket.`exceptionHandler(Handler<Throwable> handler)`
    `NetSocket` | NetSocket.`handler(Handler<Buffer> handler)`
    `NetServer` | NetServer.`listen(Handler<AsyncResult<NetServer>> listenHandler)` Like `NetServer.listen()` but providing a handler that will be notified when the server is listening, or fails.
    `NetServer` | NetServer.`listen(int port, Handler<AsyncResult<NetServer>> listenHandler)` Like `NetServer.listen(int)` but providing a handler that will be notified when the server is listening, or fails.
    `NetServer` | NetServer.`listen(int port, String host, Handler<AsyncResult<NetServer>> listenHandler)` Like `NetServer.listen(int, String)` but providing a handler that will be notified when the server is listening, or fails.
    `default NetSocket` | NetSocket.`sendFile(String filename, Handler<AsyncResult<Void>> resultHandler)` Same as `NetSocket.sendFile(String)` but also takes a handler that will be called when the send has completed or a failure has occurred
    `default NetSocket` | NetSocket.`sendFile(String filename, long offset, Handler<AsyncResult<Void>> resultHandler)` Same as `NetSocket.sendFile(String, long)` but also takes a handler that will be called when the send has completed or a failure has occurred
    `NetSocket` | NetSocket.`sendFile(String filename, long offset, long length, Handler<AsyncResult<Void>> resultHandler)` Same as `NetSocket.sendFile(String, long, long)` but also takes a handler that will be called when the send has completed or a failure has occurred
    `NetSocket` | NetSocket.`upgradeToSsl(Handler<Void> handler)` Upgrade channel to use SSL/TLS.
    `NetSocket` | NetSocket.`upgradeToSsl(String serverName, Handler<Void> handler)` Upgrade channel to use SSL/TLS.

  - ### Uses of Handler in io.vertx.core.parsetools

    Subinterfaces of Handler in io.vertx.core.parsetools
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `RecordParser` A helper class which allows you to easily parse protocols which are delimited by a sequence of bytes, or fixed size records.

    Methods in io.vertx.core.parsetools with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static RecordParser` | RecordParser.`newDelimited(Buffer delim, Handler<Buffer> output)` Create a new `RecordParser` instance, initially in delimited mode, and where the delimiter can be represented by the `Buffer` delim.
    `static RecordParser` | RecordParser.`newDelimited(String delim, Handler<Buffer> output)` Create a new `RecordParser` instance, initially in delimited mode, and where the delimiter can be represented by the String delim endcoded in latin-1 .
    `static RecordParser` | RecordParser.`newFixed(int size, Handler<Buffer> output)` Create a new `RecordParser` instance, initially in fixed size mode, and where the record size is specified by the `size` parameter.
    `void` | RecordParser.`setOutput(Handler<Buffer> output)`

  - ### Uses of Handler in io.vertx.core.shareddata

    Methods in io.vertx.core.shareddata with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | Counter.`addAndGet(long value, Handler<AsyncResult<Long>> resultHandler)` Add the value to the counter atomically and return the new count
    `void` | AsyncMap.`clear(Handler<AsyncResult<Void>> resultHandler)` Clear all entries in the map
    `void` | Counter.`compareAndSet(long expected, long value, Handler<AsyncResult<Boolean>> resultHandler)` Set the counter to the specified value only if the current value is the expectec value.
    `void` | Counter.`decrementAndGet(Handler<AsyncResult<Long>> resultHandler)` Decrement the counter atomically and return the new count
    `void` | Counter.`get(Handler<AsyncResult<Long>> resultHandler)` Get the current value of the counter
    `void` | AsyncMap.`get(K k, Handler<AsyncResult<V>> resultHandler)` Get a value from the map, asynchronously.
    `void` | Counter.`getAndAdd(long value, Handler<AsyncResult<Long>> resultHandler)` Add the value to the counter atomically and return the value before the add
    `void` | Counter.`getAndIncrement(Handler<AsyncResult<Long>> resultHandler)` Increment the counter atomically and return the value before the increment.
    `<K,V> void` | SharedData.`getClusterWideMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> resultHandler)` Get the cluster wide map with the specified name.
    `void` | SharedData.`getCounter(String name, Handler<AsyncResult<Counter>> resultHandler)` Get a cluster wide counter.
    `void` | SharedData.`getLock(String name, Handler<AsyncResult<Lock>> resultHandler)` Get a cluster wide lock with the specified name.
    `void` | SharedData.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> resultHandler)` Like `SharedData.getLock(String, Handler)` but specifying a timeout.
    `void` | Counter.`incrementAndGet(Handler<AsyncResult<Long>> resultHandler)` Increment the counter atomically and return the new count
    `void` | AsyncMap.`put(K k, V v, Handler<AsyncResult<Void>> completionHandler)` Put a value in the map, asynchronously.
    `void` | AsyncMap.`put(K k, V v, long ttl, Handler<AsyncResult<Void>> completionHandler)` Like `AsyncMap.put(K, V, io.vertx.core.Handler<io.vertx.core.AsyncResult<java.lang.Void>>)` but specifying a time to live for the entry.
    `void` | AsyncMap.`putIfAbsent(K k, V v, Handler<AsyncResult<V>> completionHandler)` Put the entry only if there is no entry with the key already present.
    `void` | AsyncMap.`putIfAbsent(K k, V v, long ttl, Handler<AsyncResult<V>> completionHandler)` Link `AsyncMap.putIfAbsent(K, V, io.vertx.core.Handler<io.vertx.core.AsyncResult<V>>)` but specifying a time to live for the entry.
    `void` | AsyncMap.`remove(K k, Handler<AsyncResult<V>> resultHandler)` Remove a value from the map, asynchronously.
    `void` | AsyncMap.`removeIfPresent(K k, V v, Handler<AsyncResult<Boolean>> resultHandler)` Remove a value from the map, only if entry already exists with same value.
    `void` | AsyncMap.`replace(K k, V v, Handler<AsyncResult<V>> resultHandler)` Replace the entry only if it is currently mapped to some value
    `void` | AsyncMap.`replaceIfPresent(K k, V oldValue, V newValue, Handler<AsyncResult<Boolean>> resultHandler)` Replace the entry only if it is currently mapped to a specific value
    `void` | AsyncMap.`size(Handler<AsyncResult<Integer>> resultHandler)` Provide the number of entries in the map

  - ### Uses of Handler in io.vertx.core.spi

    Methods in io.vertx.core.spi with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | VertxFactory.`clusteredVertx(VertxOptions options, Handler<AsyncResult<Vertx>> resultHandler)`

  - ### Uses of Handler in io.vertx.core.spi.cluster

    Methods in io.vertx.core.spi.cluster with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AsyncMultiMap.`add(K k, V v, Handler<AsyncResult<Void>> completionHandler)` Add a value to the values for that key in the map.
    `void` | AsyncMultiMap.`get(K k, Handler<AsyncResult<ChoosableIterable<V>>> resultHandler)` Get the values from the map for the key.
    `<K,V> void` | ClusterManager.`getAsyncMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> resultHandler)` Return an async map for the given name
    `<K,V> void` | ClusterManager.`getAsyncMultiMap(String name, Handler<AsyncResult<AsyncMultiMap<K,V>>> resultHandler)` Return an async multi-map for the given name
    `void` | ClusterManager.`getCounter(String name, Handler<AsyncResult<Counter>> resultHandler)`
    `void` | ClusterManager.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> resultHandler)`
    `void` | ClusterManager.`join(Handler<AsyncResult<Void>> resultHandler)` Join the cluster
    `void` | ClusterManager.`leave(Handler<AsyncResult<Void>> resultHandler)` Leave the cluster
    `void` | AsyncMultiMap.`remove(K k, V v, Handler<AsyncResult<Boolean>> completionHandler)` Remove a value from the values of that key in the map.
    `void` | AsyncMultiMap.`removeAllForValue(V v, Handler<AsyncResult<Void>> completionHandler)` Remove the specified value from all values found `equals` associated to all keys in the map.
    `void` | AsyncMultiMap.`removeAllMatching(java.util.function.Predicate<V> p, Handler<AsyncResult<Void>> completionHandler)` Remove values which satisfies the given predicate in all keys.

  - ### Uses of Handler in io.vertx.core.spi.resolver

    Methods in io.vertx.core.spi.resolver with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ResolverProvider.`close(Handler<Void> doneHandler)`

  - ### Uses of Handler in io.vertx.core.streams

    Methods in io.vertx.core.streams with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `WriteStream<T>` | WriteStream.`drainHandler(Handler<Void> handler)` Set a drain handler on the stream.
    `ReadStream<T>` | ReadStream.`endHandler(Handler<Void> endHandler)` Set an end handler.
    `ReadStream<T>` | ReadStream.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the read stream.
    `StreamBase` | StreamBase.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler.
    `WriteStream<T>` | WriteStream.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the write stream.
    `ReadStream<T>` | ReadStream.`handler(Handler<T> handler)` Set a data handler.

  - ### Uses of Handler in io.vertx.ext.auth

    Methods in io.vertx.ext.auth with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AuthProvider.`authenticate(JsonObject authInfo, Handler<AsyncResult<User>> resultHandler)` Authenticate a user.
    `protected abstract void` | AbstractUser.`doIsPermitted(String permission, Handler<AsyncResult<Boolean>> resultHandler)`
    `User` | AbstractUser.`isAuthorised(String authority, Handler<AsyncResult<Boolean>> resultHandler)`
    `User` | User.`isAuthorised(String authority, Handler<AsyncResult<Boolean>> resultHandler)` Is the user authorised to

  - ### Uses of Handler in io.vertx.ext.auth.mongo

    Methods in io.vertx.ext.auth.mongo with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | MongoAuth.`insertUser(String username, String password, List<String> roles, List<String> permissions, Handler<AsyncResult<String>> resultHandler)` Insert a new user into mongo in the convenient way

  - ### Uses of Handler in io.vertx.ext.auth.oauth2

    Methods in io.vertx.ext.auth.oauth2 with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `OAuth2Auth` | OAuth2Auth.`api(HttpMethod method, String path, JsonObject params, Handler<AsyncResult<JsonObject>> handler)` Call OAuth2 APIs.
    `OAuth2Auth` | OAuth2Auth.`decodeToken(String token, Handler<AsyncResult<AccessToken>> handler)` Decode a token to a `AccessToken` object.
    `void` | OAuth2Auth.`getToken(JsonObject params, Handler<AsyncResult<AccessToken>> handler)` Returns the Access Token object.
    `AccessToken` | AccessToken.`introspect(Handler<AsyncResult<Void>> callback)` Introspect access token.
    `OAuth2Auth` | OAuth2Auth.`introspectToken(String token, Handler<AsyncResult<AccessToken>> handler)` Query an OAuth 2.0 authorization server to determine the active state of an OAuth 2.0 token and to determine meta-information about this token.
    `OAuth2Auth` | OAuth2Auth.`introspectToken(String token, String tokenType, Handler<AsyncResult<JsonObject>> handler)` Query an OAuth 2.0 authorization server to determine the active state of an OAuth 2.0 token and to determine meta-information about this token.
    `AccessToken` | AccessToken.`logout(Handler<AsyncResult<Void>> callback)` Revoke refresh token and calls the logout endpoint.
    `AccessToken` | AccessToken.`refresh(Handler<AsyncResult<Void>> callback)` Refresh the access token
    `AccessToken` | AccessToken.`revoke(String token_type, Handler<AsyncResult<Void>> callback)` Revoke access or refresh token

  - ### Uses of Handler in io.vertx.ext.cluster.infinispan

    Methods in io.vertx.ext.cluster.infinispan with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `<K,V> void` | InfinispanClusterManager.`getAsyncMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> resultHandler)`
    `<K,V> void` | InfinispanClusterManager.`getAsyncMultiMap(String name, Handler<AsyncResult<AsyncMultiMap<K,V>>> resultHandler)`
    `void` | InfinispanClusterManager.`getCounter(String name, Handler<AsyncResult<Counter>> resultHandler)`
    `void` | InfinispanClusterManager.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> resultHandler)`
    `void` | InfinispanClusterManager.`join(Handler<AsyncResult<Void>> resultHandler)`
    `void` | InfinispanClusterManager.`leave(Handler<AsyncResult<Void>> resultHandler)`

  - ### Uses of Handler in io.vertx.ext.consul

    Methods in io.vertx.ext.consul with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `ConsulClient` | ConsulClient.`agentInfo(Handler<AsyncResult<JsonObject>> resultHandler)` Returns the configuration and member information of the local agent
    `ConsulClient` | ConsulClient.`catalogDatacenters(Handler<AsyncResult<List<String>>> resultHandler)` Return all the datacenters that are known by the Consul server
    `ConsulClient` | ConsulClient.`catalogNodes(Handler<AsyncResult<NodeList>> resultHandler)` Returns the nodes registered in a datacenter
    `ConsulClient` | ConsulClient.`catalogNodeServices(String node, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the node's registered services
    `ConsulClient` | ConsulClient.`catalogNodeServicesWithOptions(String node, BlockingQueryOptions options, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the node's registered services This is blocking query unlike `ConsulClient.catalogNodeServices(String, Handler)`
    `ConsulClient` | ConsulClient.`catalogNodesWithOptions(NodeQueryOptions options, Handler<AsyncResult<NodeList>> resultHandler)` Returns the nodes registered in a datacenter
    `ConsulClient` | ConsulClient.`catalogServiceNodes(String service, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the nodes providing a service
    `ConsulClient` | ConsulClient.`catalogServiceNodesWithOptions(String service, ServiceQueryOptions options, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the nodes providing a service
    `ConsulClient` | ConsulClient.`catalogServices(Handler<AsyncResult<ServiceList>> resultHandler)` Returns the services registered in a datacenter
    `ConsulClient` | ConsulClient.`catalogServicesWithOptions(BlockingQueryOptions options, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the services registered in a datacenter This is blocking query unlike `ConsulClient.catalogServices(Handler)`
    `ConsulClient` | ConsulClient.`cloneAclToken(String id, Handler<AsyncResult<String>> idHandler)` Clone Acl token
    `ConsulClient` | ConsulClient.`coordinateDatacenters(Handler<AsyncResult<List<DcCoordinates>>> resultHandler)` Returns the WAN network coordinates for all Consul servers, organized by DCs
    `ConsulClient` | ConsulClient.`coordinateNodes(Handler<AsyncResult<CoordinateList>> resultHandler)` Returns the LAN network coordinates for all nodes in a given DC
    `ConsulClient` | ConsulClient.`coordinateNodesWithOptions(BlockingQueryOptions options, Handler<AsyncResult<CoordinateList>> resultHandler)` Returns the LAN network coordinates for all nodes in a given DC This is blocking query unlike `ConsulClient.coordinateNodes(Handler)`
    `ConsulClient` | ConsulClient.`createAclToken(AclToken token, Handler<AsyncResult<String>> idHandler)` Create new Acl token
    `ConsulClient` | ConsulClient.`createSession(Handler<AsyncResult<String>> idHandler)` Initialize a new session
    `ConsulClient` | ConsulClient.`createSessionWithOptions(SessionOptions options, Handler<AsyncResult<String>> idHandler)` Initialize a new session
    `ConsulClient` | ConsulClient.`deleteValue(String key, Handler<AsyncResult<Void>> resultHandler)` Remove the key/value pair that corresponding to the specified key
    `ConsulClient` | ConsulClient.`deleteValues(String keyPrefix, Handler<AsyncResult<Void>> resultHandler)` Removes all the key/value pair that corresponding to the specified key prefix
    `ConsulClient` | ConsulClient.`deregisterCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Remove a check from the local agent.
    `ConsulClient` | ConsulClient.`deregisterService(String id, Handler<AsyncResult<Void>> resultHandler)` Remove a service from the local agent.
    `ConsulClient` | ConsulClient.`destroyAclToken(String id, Handler<AsyncResult<Void>> resultHandler)` Destroy Acl token
    `ConsulClient` | ConsulClient.`destroySession(String id, Handler<AsyncResult<Void>> resultHandler)` Destroys the given session
    `ConsulClient` | ConsulClient.`failCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "critical".
    `ConsulClient` | ConsulClient.`failCheckWithNote(String checkId, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "critical".
    `ConsulClient` | ConsulClient.`fireEvent(String name, Handler<AsyncResult<Event>> resultHandler)` Fires a new user event
    `ConsulClient` | ConsulClient.`fireEventWithOptions(String name, EventOptions options, Handler<AsyncResult<Event>> resultHandler)` Fires a new user event
    `ConsulClient` | ConsulClient.`getValue(String key, Handler<AsyncResult<KeyValue>> resultHandler)` Returns key/value pair that corresponding to the specified key
    `ConsulClient` | ConsulClient.`getValues(String keyPrefix, Handler<AsyncResult<KeyValueList>> resultHandler)` Returns the list of key/value pairs that corresponding to the specified key prefix.
    `ConsulClient` | ConsulClient.`getValuesWithOptions(String keyPrefix, BlockingQueryOptions options, Handler<AsyncResult<KeyValueList>> resultHandler)` Returns the list of key/value pairs that corresponding to the specified key prefix.
    `ConsulClient` | ConsulClient.`getValueWithOptions(String key, BlockingQueryOptions options, Handler<AsyncResult<KeyValue>> resultHandler)` Returns key/value pair that corresponding to the specified key.
    `ConsulClient` | ConsulClient.`healthChecks(String service, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks associated with the service
    `ConsulClient` | ConsulClient.`healthChecksWithOptions(String service, CheckQueryOptions options, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks associated with the service
    `ConsulClient` | ConsulClient.`healthServiceNodes(String service, boolean passing, Handler<AsyncResult<ServiceEntryList>> resultHandler)` Returns the nodes providing the service.
    `ConsulClient` | ConsulClient.`healthServiceNodesWithOptions(String service, boolean passing, ServiceQueryOptions options, Handler<AsyncResult<ServiceEntryList>> resultHandler)` Returns the nodes providing the service.
    `ConsulClient` | ConsulClient.`healthState(CheckStatus checkStatus, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks in the specified status
    `ConsulClient` | ConsulClient.`healthStateWithOptions(CheckStatus checkStatus, CheckQueryOptions options, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks in the specified status
    `ConsulClient` | ConsulClient.`infoAclToken(String id, Handler<AsyncResult<AclToken>> tokenHandler)` Get info of Acl token
    `ConsulClient` | ConsulClient.`infoSession(String id, Handler<AsyncResult<Session>> resultHandler)` Returns the requested session information
    `ConsulClient` | ConsulClient.`infoSessionWithOptions(String id, BlockingQueryOptions options, Handler<AsyncResult<Session>> resultHandler)` Returns the requested session information This is blocking query unlike `ConsulClient.infoSession(String, Handler)`
    `ConsulClient` | ConsulClient.`leaderStatus(Handler<AsyncResult<String>> resultHandler)` Get the Raft leader for the datacenter in which the agent is running.
    `ConsulClient` | ConsulClient.`listAclTokens(Handler<AsyncResult<List<AclToken>>> resultHandler)` Get list of Acl token
    `ConsulClient` | ConsulClient.`listEvents(Handler<AsyncResult<EventList>> resultHandler)` Returns the most recent events known by the agent
    `ConsulClient` | ConsulClient.`listEventsWithOptions(EventListOptions options, Handler<AsyncResult<EventList>> resultHandler)` Returns the most recent events known by the agent.
    `ConsulClient` | ConsulClient.`listNodeSessions(String nodeId, Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions for a given node
    `ConsulClient` | ConsulClient.`listNodeSessionsWithOptions(String nodeId, BlockingQueryOptions options, Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions for a given node This is blocking query unlike `ConsulClient.listNodeSessions(String, Handler)`
    `ConsulClient` | ConsulClient.`listSessions(Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions
    `ConsulClient` | ConsulClient.`listSessionsWithOptions(BlockingQueryOptions options, Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions This is blocking query unlike `ConsulClient.listSessions(Handler)`
    `ConsulClient` | ConsulClient.`localChecks(Handler<AsyncResult<List<Check>>> resultHandler)` Return all the checks that are registered with the local agent.
    `ConsulClient` | ConsulClient.`localServices(Handler<AsyncResult<List<Service>>> resultHandler)` Returns list of services registered with the local agent.
    `ConsulClient` | ConsulClient.`maintenanceService(MaintenanceOptions maintenanceOptions, Handler<AsyncResult<Void>> resultHandler)` Places a given service into "maintenance mode"
    `ConsulClient` | ConsulClient.`passCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "passing".
    `ConsulClient` | ConsulClient.`passCheckWithNote(String checkId, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "passing".
    `ConsulClient` | ConsulClient.`peersStatus(Handler<AsyncResult<List<String>>> resultHandler)` Retrieves the Raft peers for the datacenter in which the the agent is running.
    `ConsulClient` | ConsulClient.`putValue(String key, String value, Handler<AsyncResult<Boolean>> resultHandler)` Adds specified key/value pair
    `ConsulClient` | ConsulClient.`putValueWithOptions(String key, String value, KeyValueOptions options, Handler<AsyncResult<Boolean>> resultHandler)`
    `ConsulClient` | ConsulClient.`registerCheck(CheckOptions checkOptions, Handler<AsyncResult<Void>> resultHandler)` Add a new check to the local agent.
    `ConsulClient` | ConsulClient.`registerService(ServiceOptions serviceOptions, Handler<AsyncResult<Void>> resultHandler)` Adds a new service, with an optional health check, to the local agent.
    `ConsulClient` | ConsulClient.`renewSession(String id, Handler<AsyncResult<Session>> resultHandler)` Renews the given session.
    `Watch<T>` | Watch.`setHandler(Handler<AsyncResult<T>> handler)` Set the result handler.
    `ConsulClient` | ConsulClient.`transaction(TxnRequest request, Handler<AsyncResult<TxnResponse>> resultHandler)` Manages multiple operations inside a single, atomic transaction.
    `ConsulClient` | ConsulClient.`updateAclToken(AclToken token, Handler<AsyncResult<String>> idHandler)` Update Acl token
    `ConsulClient` | ConsulClient.`updateCheck(String checkId, CheckStatus status, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to given status.
    `ConsulClient` | ConsulClient.`updateCheckWithNote(String checkId, CheckStatus status, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to given status.
    `ConsulClient` | ConsulClient.`warnCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "warning".
    `ConsulClient` | ConsulClient.`warnCheckWithNote(String checkId, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "warning".

  - ### Uses of Handler in io.vertx.ext.eventbus.bridge.tcp

    Methods in io.vertx.ext.eventbus.bridge.tcp with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | TcpEventBusBridge.`close(Handler<AsyncResult<Void>> handler)` Close the current socket.
    `TcpEventBusBridge` | TcpEventBusBridge.`listen(Handler<AsyncResult<TcpEventBusBridge>> handler)` Listen on default port 7000 with a handler to report the state of the socket listen operation.
    `TcpEventBusBridge` | TcpEventBusBridge.`listen(int port, Handler<AsyncResult<TcpEventBusBridge>> handler)` Listen on specific port
    `TcpEventBusBridge` | TcpEventBusBridge.`listen(int port, String address, Handler<AsyncResult<TcpEventBusBridge>> handler)` Listen on specific port and bind to specific address

  - ### Uses of Handler in io.vertx.ext.healthchecks

    Subinterfaces of Handler in io.vertx.ext.healthchecks
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `HealthCheckHandler` A Vert.x Web handler on which you register health check procedure.

    Methods in io.vertx.ext.healthchecks with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `HealthChecks` | HealthChecks.`invoke(Handler<JsonObject> resultHandler)` Invokes the registered procedures and computes the outcome.
    `HealthChecks` | HealthChecks.`invoke(String name, Handler<AsyncResult<JsonObject>> resultHandler)` Invokes the registered procedure with the given name and sub-procedures.
    `HealthCheckHandler` | HealthCheckHandler.`register(String name, Handler<Future<Status>> procedure)` Registers a health check procedure.
    `HealthChecks` | HealthChecks.`register(String name, Handler<Future<Status>> procedure)` Registers a health check procedure.

  - ### Uses of Handler in io.vertx.ext.httpservicefactory

    Methods in io.vertx.ext.httpservicefactory with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | HttpServiceFactory.`doRequest(HttpClient client, File file, URI url, File signatureFile, URI signatureURL, Handler<AsyncResult<io.vertx.ext.httpservicefactory.HttpServiceFactory.Result>> handler)`

  - ### Uses of Handler in io.vertx.ext.mail

    Classes in io.vertx.ext.mail that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `MailServiceVertxProxyHandler`

    Methods in io.vertx.ext.mail with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `MailClient` | MailClient.`sendMail(MailMessage email, Handler<AsyncResult<MailResult>> resultHandler)` send a single mail via MailClient
    `MailService` | MailService.`sendMail(MailMessage email, Handler<AsyncResult<MailResult>> resultHandler)`
    `MailService` | MailServiceVertxEBProxy.`sendMail(MailMessage email, Handler<AsyncResult<MailResult>> resultHandler)`

  - ### Uses of Handler in io.vertx.ext.mongo

    Methods in io.vertx.ext.mongo with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `MongoClient` | MongoClient.`bulkWrite(String collection, List<BulkOperation> operations, Handler<AsyncResult<MongoClientBulkWriteResult>> resultHandler)` Execute a bulk operation.
    `MongoClient` | MongoClient.`bulkWriteWithOptions(String collection, List<BulkOperation> operations, BulkWriteOptions bulkWriteOptions, Handler<AsyncResult<MongoClientBulkWriteResult>> resultHandler)` Execute a bulk operation with the specified write options.
    `MongoClient` | MongoClient.`count(String collection, JsonObject query, Handler<AsyncResult<Long>> resultHandler)` Count matching documents in a collection.
    `MongoClient` | MongoClient.`createCollection(String collectionName, Handler<AsyncResult<Void>> resultHandler)` Create a new collection
    `MongoClient` | MongoClient.`createIndex(String collection, JsonObject key, Handler<AsyncResult<Void>> resultHandler)` Creates an index.
    `MongoClient` | MongoClient.`createIndexWithOptions(String collection, JsonObject key, IndexOptions options, Handler<AsyncResult<Void>> resultHandler)` Creates an index.
    `MongoClient` | MongoClient.`distinct(String collection, String fieldName, String resultClassname, Handler<AsyncResult<JsonArray>> resultHandler)` Gets the distinct values of the specified field name.
    `MongoClient` | MongoClient.`distinctBatch(String collection, String fieldName, String resultClassname, Handler<AsyncResult<JsonObject>> resultHandler)` Gets the distinct values of the specified field name.
    `MongoClient` | MongoClient.`dropCollection(String collection, Handler<AsyncResult<Void>> resultHandler)` Drop a collection
    `MongoClient` | MongoClient.`dropIndex(String collection, String indexName, Handler<AsyncResult<Void>> resultHandler)` Drops the index given its name.
    `MongoClient` | MongoClient.`find(String collection, JsonObject query, Handler<AsyncResult<List<JsonObject>>> resultHandler)` Find matching documents in the specified collection
    `MongoClient` | MongoClient.`findBatch(String collection, JsonObject query, Handler<AsyncResult<JsonObject>> resultHandler)` Find matching documents in the specified collection.
    `MongoClient` | MongoClient.`findBatchWithOptions(String collection, JsonObject query, FindOptions options, Handler<AsyncResult<JsonObject>> resultHandler)` Find matching documents in the specified collection, specifying options.
    `MongoClient` | MongoClient.`findOne(String collection, JsonObject query, JsonObject fields, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection
    `MongoClient` | MongoClient.`findOneAndDelete(String collection, JsonObject query, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and delete it.
    `MongoClient` | MongoClient.`findOneAndDeleteWithOptions(String collection, JsonObject query, FindOptions findOptions, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and delete it.
    `MongoClient` | MongoClient.`findOneAndReplace(String collection, JsonObject query, JsonObject replace, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and replace it.
    `MongoClient` | MongoClient.`findOneAndReplaceWithOptions(String collection, JsonObject query, JsonObject replace, FindOptions findOptions, UpdateOptions updateOptions, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and replace it.
    `MongoClient` | MongoClient.`findOneAndUpdate(String collection, JsonObject query, JsonObject update, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and update it.
    `MongoClient` | MongoClient.`findOneAndUpdateWithOptions(String collection, JsonObject query, JsonObject update, FindOptions findOptions, UpdateOptions updateOptions, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and update it.
    `MongoClient` | MongoClient.`findWithOptions(String collection, JsonObject query, FindOptions options, Handler<AsyncResult<List<JsonObject>>> resultHandler)` Find matching documents in the specified collection, specifying options
    `MongoClient` | MongoClient.`getCollections(Handler<AsyncResult<List<String>>> resultHandler)` Get a list of all collections in the database.
    `MongoClient` | MongoClient.`insert(String collection, JsonObject document, Handler<AsyncResult<String>> resultHandler)` Insert a document in the specified collection
    `MongoClient` | MongoClient.`insertWithOptions(String collection, JsonObject document, WriteOption writeOption, Handler<AsyncResult<String>> resultHandler)` Insert a document in the specified collection with the specified write option
    `MongoClient` | MongoClient.`listIndexes(String collection, Handler<AsyncResult<JsonArray>> resultHandler)` Get all the indexes in this collection.
    `MongoClient` | MongoClient.`remove(String collection, JsonObject query, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`removeDocument(String collection, JsonObject query, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove a single matching document from a collection and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeDocuments(String collection, JsonObject query, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove matching documents from a collection and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeDocumentsWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove matching documents from a collection with the specified write option and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeDocumentWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove a single matching document from a collection with the specified write option and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeOne(String collection, JsonObject query, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`removeOneWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`removeWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`replace(String collection, JsonObject query, JsonObject replace, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`replaceDocuments(String collection, JsonObject query, JsonObject replace, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Replace matching documents in the specified collection and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`replaceDocumentsWithOptions(String collection, JsonObject query, JsonObject replace, UpdateOptions options, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Replace matching documents in the specified collection, specifying options and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`replaceWithOptions(String collection, JsonObject query, JsonObject replace, UpdateOptions options, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`runCommand(String commandName, JsonObject command, Handler<AsyncResult<JsonObject>> resultHandler)` Run an arbitrary MongoDB command.
    `MongoClient` | MongoClient.`save(String collection, JsonObject document, Handler<AsyncResult<String>> resultHandler)` Save a document in the specified collection
    `MongoClient` | MongoClient.`saveWithOptions(String collection, JsonObject document, WriteOption writeOption, Handler<AsyncResult<String>> resultHandler)` Save a document in the specified collection with the specified write option
    `MongoClient` | MongoClient.`update(String collection, JsonObject query, JsonObject update, Handler<AsyncResult<Void>> resultHandler)` Deprecated.
    `MongoClient` | MongoClient.`updateCollection(String collection, JsonObject query, JsonObject update, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Update matching documents in the specified collection and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`updateCollectionWithOptions(String collection, JsonObject query, JsonObject update, UpdateOptions options, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Update matching documents in the specified collection, specifying options and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`updateWithOptions(String collection, JsonObject query, JsonObject update, UpdateOptions options, Handler<AsyncResult<Void>> resultHandler)` Deprecated.

  - ### Uses of Handler in io.vertx.ext.reactivestreams

    Methods in io.vertx.ext.reactivestreams with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `ReactiveWriteStream<T>` | ReactiveWriteStream.`drainHandler(Handler<Void> handler)`
    `ReactiveReadStream<T>` | ReactiveReadStream.`endHandler(Handler<Void> endHandler)`
    `ReactiveReadStream<T>` | ReactiveReadStream.`exceptionHandler(Handler<Throwable> handler)`
    `ReactiveWriteStream<T>` | ReactiveWriteStream.`exceptionHandler(Handler<Throwable> handler)`
    `ReactiveReadStream<T>` | ReactiveReadStream.`handler(Handler<T> handler)`

  - ### Uses of Handler in io.vertx.ext.rxjava.eventbus.bridge.tcp

    Methods in io.vertx.ext.rxjava.eventbus.bridge.tcp with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | TcpEventBusBridge.`close(Handler<AsyncResult<Void>> handler)` Close the current socket.
    `TcpEventBusBridge` | TcpEventBusBridge.`listen(Handler<AsyncResult<TcpEventBusBridge>> handler)` Listen on default port 7000 with a handler to report the state of the socket listen operation.
    `TcpEventBusBridge` | TcpEventBusBridge.`listen(int port, Handler<AsyncResult<TcpEventBusBridge>> handler)` Listen on specific port
    `TcpEventBusBridge` | TcpEventBusBridge.`listen(int port, String address, Handler<AsyncResult<TcpEventBusBridge>> handler)` Listen on specific port and bind to specific address

  - ### Uses of Handler in io.vertx.ext.shell

    Methods in io.vertx.ext.shell with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ShellServer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the shell server, this is an asynchronous close.
    `ShellServer` | ShellServer.`listen(Handler<AsyncResult<Void>> listenHandler)` Start the shell service, this is an asynchronous start.
    `void` | ShellService.`start(Handler<AsyncResult<Void>> startHandler)` Start the shell service, this is an asynchronous start.
    `void` | ShellService.`stop(Handler<AsyncResult<Void>> stopHandler)` Stop the shell service, this is an asynchronous start.

  - ### Uses of Handler in io.vertx.ext.shell.command

    Methods in io.vertx.ext.shell.command with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `CommandProcess` | CommandProcess.`backgroundHandler(Handler<Void> handler)` Set a background handler, this handler is called when the command is running and put to background.
    `CommandBuilder` | CommandBuilder.`completionHandler(Handler<Completion> handler)` Set the command completion handler, the completion handler when the user asks for contextual command line completion, usually hitting the tab key.
    `CommandProcess` | CommandProcess.`endHandler(Handler<Void> handler)` Set an end handler, this handler is called when the command is ended, for instance the command is running and the shell closes.
    `CommandProcess` | CommandProcess.`foregroundHandler(Handler<Void> handler)` Set a foreground handler, this handler is called when the command is running and put to foreground.
    `CommandProcess` | CommandProcess.`interruptHandler(Handler<Void> handler)` Set an interrupt handler, this handler is called when the command is interrupted, for instance user press `Ctrl-C`.
    `CommandBuilder` | CommandBuilder.`processHandler(Handler<CommandProcess> handler)` Set the command process handler, the process handler is called when the command is executed.
    `CommandRegistry` | CommandRegistry.`registerCommand(Class<? extends AnnotatedCommand> command, Handler<AsyncResult<Command>> completionHandler)` Register a single command.
    `CommandRegistry` | CommandRegistry.`registerCommand(Command command, Handler<AsyncResult<Command>> completionHandler)` Register a command
    `CommandRegistry` | CommandRegistry.`registerCommands(List<Command> commands, Handler<AsyncResult<List<Command>>> completionHandler)` Register a list of commands.
    `CommandProcess` | CommandProcess.`resizehandler(Handler<Void> handler)`
    `CommandProcess` | CommandProcess.`resumeHandler(Handler<Void> handler)` Set a resume handler, this handler is called when the command is resumed, for instance user types `bg` or `fg` to resume the command.
    `CommandProcess` | CommandProcess.`stdinHandler(Handler<String> handler)`
    `CommandProcess` | CommandProcess.`suspendHandler(Handler<Void> handler)` Set a suspend handler, this handler is called when the command is suspended, for instance user press `Ctrl-Z`.
    `CommandRegistry` | CommandRegistry.`unregisterCommand(String commandName, Handler<AsyncResult<Void>> completionHandler)` Unregister a command.

  - ### Uses of Handler in io.vertx.ext.shell.spi

    Methods in io.vertx.ext.shell.spi with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | CommandResolverFactory.`resolver(Vertx vertx, Handler<AsyncResult<CommandResolver>> resolveHandler)` Obtain a command resolver for a Vert.x instance.

  - ### Uses of Handler in io.vertx.ext.shell.system

    Methods in io.vertx.ext.shell.system with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | JobController.`close(Handler<Void> completionHandler)` Close the controller and terminate all the underlying jobs, a closed controller does not accept anymore jobs.
    `boolean` | Process.`interrupt(Handler<Void> completionHandler)` Attempt to interrupt the process.
    `void` | Process.`resume(boolean foreground, Handler<Void> completionHandler)` Suspend the process.
    `default void` | Process.`resume(Handler<Void> completionHandler)` Suspend the process.
    `Job` | Job.`statusUpdateHandler(Handler<ExecStatus> handler)` Set an handler called when the job terminates.
    `void` | Process.`suspend(Handler<Void> completionHandler)` Resume the process.
    `void` | Process.`terminate(Handler<Void> completionHandler)` Terminate the process.
    `Process` | Process.`terminatedHandler(Handler<Integer> handler)` Set an handler for being notified when the process terminates.
    `void` | Process.`toBackground(Handler<Void> completionHandler)` Set the process in background.
    `void` | Process.`toForeground(Handler<Void> completionHandler)` Set the process in foreground.

  - ### Uses of Handler in io.vertx.ext.shell.term

    Subinterfaces of Handler in io.vertx.ext.shell.term
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `SockJSTermHandler`

    Methods in io.vertx.ext.shell.term with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | TermServer.`close(Handler<AsyncResult<Void>> completionHandler)` Like `TermServer.close()` but supplying a handler that will be notified when close is complete.
    `Term` | Term.`closeHandler(Handler<Void> handler)` Set a handler that will be called when the terminal is closed.
    `TermServer` | TermServer.`listen(Handler<AsyncResult<TermServer>> listenHandler)` Bind the term server, the `TermServer.termHandler(Handler)` must be set before.
    `void` | Term.`readline(String prompt, Handler<String> lineHandler)` Prompt the user a line of text.
    `void` | Term.`readline(String prompt, Handler<String> lineHandler, Handler<Completion> completionHandler)` Prompt the user a line of text, providing a completion handler to handle user's completion.
    `void` | Term.`readline(String prompt, Handler<String> lineHandler, Handler<Completion> completionHandler)` Prompt the user a line of text, providing a completion handler to handle user's completion.
    `Term` | Term.`resizehandler(Handler<Void> handler)`
    `Tty` | Tty.`resizehandler(Handler<Void> handler)` Set a resize handler, the handler is called when the tty size changes.
    `Term` | Term.`stdinHandler(Handler<String> handler)`
    `Tty` | Tty.`stdinHandler(Handler<String> handler)` Set a stream handler on the standard input to read the data.
    `Pty` | Pty.`stdoutHandler(Handler<String> handler)` Set the standard out handler of the pseudo terminal.
    `SockJSTermHandler` | SockJSTermHandler.`termHandler(Handler<Term> handler)`
    `TermServer` | TermServer.`termHandler(Handler<Term> handler)` Set the term handler that will receive incoming client connections.

  - ### Uses of Handler in io.vertx.ext.sql

    Methods in io.vertx.ext.sql with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `SQLConnection` | SQLConnection.`batch(List<String> sqlStatements, Handler<AsyncResult<List<Integer>>> handler)` Batch simple SQL strings and execute the batch where the async result contains a array of Integers.
    `SQLConnection` | SQLConnection.`batchCallableWithParams(String sqlStatement, List<JsonArray> inArgs, List<JsonArray> outArgs, Handler<AsyncResult<List<Integer>>> handler)` Batch a callable statement with all entries from the args list.
    `SQLConnection` | SQLConnection.`batchWithParams(String sqlStatement, List<JsonArray> args, Handler<AsyncResult<List<Integer>>> handler)` Batch a prepared statement with all entries from the args list.
    `SQLConnection` | SQLConnection.`call(String sql, Handler<AsyncResult<ResultSet>> resultHandler)` Calls the given SQL `PROCEDURE` which returns the result from the procedure.
    `SQLConnection` | SQLConnection.`callWithParams(String sql, JsonArray params, JsonArray outputs, Handler<AsyncResult<ResultSet>> resultHandler)` Calls the given SQL `PROCEDURE` which returns the result from the procedure.
    `void` | SQLClient.`close(Handler<AsyncResult<Void>> completionHandler)` Close the client and release all resources.
    `void` | SQLConnection.`close(Handler<AsyncResult<Void>> handler)` Closes the connection.
    `void` | SQLRowStream.`close(Handler<AsyncResult<Void>> handler)` Closes the stream/underlying cursor(s).
    `SQLConnection` | SQLConnection.`commit(Handler<AsyncResult<Void>> handler)` Commits all changes made since the previous commit/rollback.
    `SQLRowStream` | SQLRowStream.`endHandler(Handler<Void> endHandler)`
    `SQLRowStream` | SQLRowStream.`exceptionHandler(Handler<Throwable> handler)`
    `SQLConnection` | SQLConnection.`execute(String sql, Handler<AsyncResult<Void>> resultHandler)` Executes the given SQL statement
    `SQLClient` | SQLClient.`getConnection(Handler<AsyncResult<SQLConnection>> handler)` Returns a connection that can be used to perform SQL operations on.
    `SQLConnection` | SQLConnection.`getTransactionIsolation(Handler<AsyncResult<TransactionIsolation>> handler)` Attempts to return the transaction isolation level for this Connection object to the one given.
    `SQLRowStream` | SQLRowStream.`handler(Handler<JsonArray> handler)`
    `SQLConnection` | SQLConnection.`query(String sql, Handler<AsyncResult<ResultSet>> resultHandler)` Executes the given SQL `SELECT` statement which returns the results of the query.
    `SQLConnection` | SQLConnection.`queryStream(String sql, Handler<AsyncResult<SQLRowStream>> handler)` Executes the given SQL `SELECT` statement which returns the results of the query as a read stream.
    `SQLConnection` | SQLConnection.`queryStreamWithParams(String sql, JsonArray params, Handler<AsyncResult<SQLRowStream>> handler)` Executes the given SQL `SELECT` statement which returns the results of the query as a read stream.
    `SQLConnection` | SQLConnection.`queryWithParams(String sql, JsonArray params, Handler<AsyncResult<ResultSet>> resultHandler)` Executes the given SQL `SELECT` prepared statement which returns the results of the query.
    `SQLRowStream` | SQLRowStream.`resultSetClosedHandler(Handler<Void> handler)` Event handler when a resultset is closed.
    `SQLConnection` | SQLConnection.`rollback(Handler<AsyncResult<Void>> handler)` Rolls back all changes made since the previous commit/rollback.
    `SQLConnection` | SQLConnection.`setAutoCommit(boolean autoCommit, Handler<AsyncResult<Void>> resultHandler)` Sets the auto commit flag for this connection.
    `SQLConnection` | SQLConnection.`setTransactionIsolation(TransactionIsolation isolation, Handler<AsyncResult<Void>> handler)` Attempts to change the transaction isolation level for this Connection object to the one given.
    `SQLConnection` | SQLConnection.`update(String sql, Handler<AsyncResult<UpdateResult>> resultHandler)` Executes the given SQL statement which may be an `INSERT`, `UPDATE`, or `DELETE` statement.
    `SQLConnection` | SQLConnection.`updateWithParams(String sql, JsonArray params, Handler<AsyncResult<UpdateResult>> resultHandler)` Executes the given prepared statement which may be an `INSERT`, `UPDATE`, or `DELETE` statement with the given parameters

  - ### Uses of Handler in io.vertx.ext.stomp

    Subinterfaces of Handler in io.vertx.ext.stomp
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `StompServerHandler` STOMP server handler implements the behavior of the STOMP server when a specific event occurs.

    Classes in io.vertx.ext.stomp that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `DefaultAbortHandler` STOMP compliant actions executed when receiving a `ABORT` frame.
    `class` | `DefaultAckHandler` STOMP compliant actions executed when receiving a `ACK` frame.
    `class` | `DefaultBeginHandler` STOMP compliant actions executed when receiving a `BEGIN` frame.
    `class` | `DefaultCommitHandler` STOMP compliant actions executed when receiving a `COMMIT` frame.
    `class` | `DefaultConnectHandler` STOMP compliant actions executed when receiving a `CONNECT` frame.
    `class` | `DefaultNackHandler` STOMP compliant actions executed when receiving a `NACK` sf.frame().
    `class` | `DefaultSendHandler` STOMP compliant actions executed when receiving a `SEND` sf.frame().
    `class` | `DefaultSubscribeHandler` STOMP compliant actions executed when receiving a `SUBSCRIBE` frame.
    `class` | `DefaultUnsubscribeHandler` STOMP compliant actions executed when receiving a `UNSUBSCRIBE` frame.

    Methods in io.vertx.ext.stomp that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<ServerWebSocket>` | StompServer.`webSocketHandler()` Gets the `Handler` able to manage web socket connections.

    Methods in io.vertx.ext.stomp with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `StompClientConnection` | StompClientConnection.`abort(String id, Handler<Frame> receiptHandler)` Aborts a transaction.
    `StompClientConnection` | StompClientConnection.`abort(String id, Map<String,String> headers, Handler<Frame> receiptHandler)` Aborts a transaction.
    `StompServerHandler` | StompServerHandler.`abortHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `ABORT` frame is received.
    `StompClientConnection` | StompClientConnection.`ack(String id, Handler<Frame> receiptHandler)` Sends an acknowledgement for a specific message.
    `StompClientConnection` | StompClientConnection.`ack(String id, String txId, Handler<Frame> receiptHandler)` Sends an acknowledgement for the given frame.
    `StompServerHandler` | StompServerHandler.`ackHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `ACK` frame is received.
    `StompServerHandler` | StompServerHandler.`beginHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `BEGIN` frame is received.
    `StompClientConnection` | StompClientConnection.`beginTX(String id, Handler<Frame> receiptHandler)` Begins a transaction.
    `StompClientConnection` | StompClientConnection.`beginTX(String id, Map<String,String> headers, Handler<Frame> receiptHandler)` Begins a transaction.
    `void` | StompServer.`close(Handler<AsyncResult<Void>> completionHandler)` Closes the server.
    `StompClientConnection` | StompClientConnection.`closeHandler(Handler<StompClientConnection> handler)` Sets a handler notified when the STOMP connection is closed.
    `StompServerHandler` | StompServerHandler.`closeHandler(Handler<StompServerConnection> handler)` Configures the action to execute when a connection with the client is closed.
    `StompClientConnection` | StompClientConnection.`commit(String id, Handler<Frame> receiptHandler)` Commits a transaction.
    `StompClientConnection` | StompClientConnection.`commit(String id, Map<String,String> headers, Handler<Frame> receiptHandler)` Commits a transaction.
    `StompServerHandler` | StompServerHandler.`commitHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `COMMIT` frame is received.
    `void` | StompServerConnection.`configureHeartbeat(long ping, long pong, Handler<StompServerConnection> pingHandler)` Configures the heartbeat.
    `StompClient` | StompClient.`connect(Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server using the host and port configured in the client's options.
    `StompClient` | StompClient.`connect(int port, String host, Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server.
    `StompClient` | StompClient.`connect(int port, String host, NetClient net, Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server.
    `StompClient` | StompClient.`connect(NetClient net, Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server.
    `StompServerHandler` | StompServerHandler.`connectHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `CONNECT` frame is received.
    `StompClientConnection` | StompClientConnection.`connectionDroppedHandler(Handler<StompClientConnection> handler)` Sets a handler notified when the server does not respond to a `ping` request in time.
    `StompClientConnection` | StompClientConnection.`disconnect(Frame frame, Handler<Frame> receiptHandler)` Disconnects the client.
    `StompClientConnection` | StompClientConnection.`disconnect(Handler<Frame> receiptHandler)` Disconnects the client.
    `StompServerHandler` | StompServerHandler.`disconnectHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `DISCONNECT` frame is received.
    `StompClient` | StompClient.`errorFrameHandler(Handler<Frame> handler)` A general error frame handler.
    `StompClientConnection` | StompClientConnection.`errorHandler(Handler<Frame> handler)` Sets a handler notified when an `ERROR` frame is received by the client.
    `StompServer` | StompServer.`listen(Handler<AsyncResult<StompServer>> handler)` Connects the STOMP server default port (61613) and network interface (`0.0.0.0`).
    `StompServer` | StompServer.`listen(int port, Handler<AsyncResult<StompServer>> handler)` Connects the STOMP server to the given port.
    `StompServer` | StompServer.`listen(int port, String host, Handler<AsyncResult<StompServer>> handler)` Connects the STOMP server to the given port / interface.
    `StompClientConnection` | StompClientConnection.`nack(String id, Handler<Frame> receiptHandler)` Sends a non-acknowledgement for the given message.
    `StompClientConnection` | StompClientConnection.`nack(String id, String txId, Handler<Frame> receiptHandler)` Sends a non-acknowledgement for the given frame.
    `StompServerHandler` | StompServerHandler.`nackHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `NACK` frame is received.
    `StompServerHandler` | StompServerHandler.`onAckHandler(Handler<Acknowledgement> handler)` Configures the action to execute when messages are acknowledged.
    `StompServerHandler` | StompServerHandler.`onAuthenticationRequest(StompServer server, String login, String passcode, Handler<AsyncResult<Boolean>> handler)` Called when the client connects to a server requiring authentication.
    `StompServerHandler` | StompServerHandler.`onNackHandler(Handler<Acknowledgement> handler)` Configures the action to execute when messages are not acknowledged.
    `StompClientConnection` | StompClientConnection.`pingHandler(Handler<StompClientConnection> handler)` Sets a handler that let customize the behavior when a ping needs to be sent to the server.
    `StompServerHandler` | StompServerHandler.`pingHandler(Handler<StompServerConnection> handler)` Allows customizing the action to do when the server needs to send a `PING` to the client.
    `StompClient` | StompClient.`receivedFrameHandler(Handler<Frame> handler)` Configures a received handler that gets notified when a STOMP frame is received by the client.
    `StompClientConnection` | StompClientConnection.`receivedFrameHandler(Handler<Frame> handler)` Configures a received handler that get notified when a STOMP frame is received by the client.
    `StompServerHandler` | StompServerHandler.`receivedFrameHandler(Handler<ServerFrame> handler)` Configures a handler that get notified when a STOMP frame is received by the server.
    `StompClientConnection` | StompClientConnection.`send(Frame frame, Handler<Frame> receiptHandler)` Sends the given frame to the server.
    `StompClientConnection` | StompClientConnection.`send(Map<String,String> headers, Buffer body, Handler<Frame> receiptHandler)` Sends a `SEND` frame to the server.
    `StompClientConnection` | StompClientConnection.`send(String destination, Buffer body, Handler<Frame> receiptHandler)` Sends a `SEND` frame to the server to the given destination.
    `StompClientConnection` | StompClientConnection.`send(String destination, Map<String,String> headers, Buffer body, Handler<Frame> receiptHandler)` Sends a `SEND` frame to the server to the given destination.
    `StompServerHandler` | StompServerHandler.`sendHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `SEND` frame is received.
    `StompServerHandler` | StompServerHandler.`stompHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `STOMP` frame is received.
    `String` | StompClientConnection.`subscribe(String destination, Handler<Frame> handler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Map<String,String> headers, Handler<Frame> handler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Map<String,String> headers, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Map<String,String> headers, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `StompServerHandler` | StompServerHandler.`subscribeHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `SUBSCRIBE` frame is received.
    `StompClientConnection` | StompClientConnection.`unsubscribe(String destination, Handler<Frame> receiptHandler)` Un-subscribes from the given destination.
    `StompClientConnection` | StompClientConnection.`unsubscribe(String destination, Map<String,String> headers, Handler<Frame> receiptHandler)` Un-subscribes from the given destination.
    `StompServerHandler` | StompServerHandler.`unsubscribeHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `UNSUBSCRIBE` frame is received.
    `StompClient` | StompClient.`writingFrameHandler(Handler<Frame> handler)` Configures a writing handler that gets notified when a STOMP frame is written on the wire.
    `StompClientConnection` | StompClientConnection.`writingFrameHandler(Handler<Frame> handler)` Configures a handler notified when a frame is going to be written on the wire.
    `StompServer` | StompServer.`writingFrameHandler(Handler<ServerFrame> handler)` Configures the handler that is invoked every time a frame is going to be written to the "wire".

  - ### Uses of Handler in io.vertx.ext.sync

    Subinterfaces of Handler in io.vertx.ext.sync
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `HandlerReceiverAdaptor<T>` Represents an object that is both a handler of a particular event and also a receiver of that event.

    Methods in io.vertx.ext.sync that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `static <T> Handler<T>` | Sync.`fiberHandler(Handler<T> handler)` Convert a standard handler to a handler which runs on a fiber.

    Methods in io.vertx.ext.sync with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static <T> Handler<T>` | Sync.`fiberHandler(Handler<T> handler)` Convert a standard handler to a handler which runs on a fiber.

    Method parameters in io.vertx.ext.sync with type arguments of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static <T> T` | Sync.`awaitEvent(java.util.function.Consumer<Handler<T>> consumer)` Receive a single event from a handler synchronously.
    `static <T> T` | Sync.`awaitEvent(java.util.function.Consumer<Handler<T>> consumer, long timeout)` Receive a single event from a handler synchronously.
    `static <T> T` | Sync.`awaitResult(java.util.function.Consumer<Handler<AsyncResult<T>>> consumer)` Invoke an asynchronous operation and obtain the result synchronous.
    `static <T> T` | Sync.`awaitResult(java.util.function.Consumer<Handler<AsyncResult<T>>> consumer, long timeout)` Invoke an asynchronous operation and obtain the result synchronous.

  - ### Uses of Handler in io.vertx.ext.unit

    Methods in io.vertx.ext.unit that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertFailure()` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a failed result it completes the async operation. When the returned handler is called back with a succeeded result it fails the test.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertFailure(Handler<Throwable> causeHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a failed result it completes the async operation. When the returned handler is called back with a succeeded result it fails the test.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertSuccess()` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a succeeded result it completes the async operation. When the returned handler is called back with a failed result it fails the test with the cause of the failure.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertSuccess(Handler<T> resultHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a succeeded result it invokes the `resultHandler` argument with the async result.
    `Handler<Throwable>` | TestContext.`exceptionHandler()`

    Methods in io.vertx.ext.unit with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `TestSuite` | TestSuite.`after(Handler<TestContext> callback)` Set a callback executed after the tests.
    `TestSuite` | TestSuite.`afterEach(Handler<TestContext> callback)` Set a callback executed after each test and before the suite `after` callback.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertFailure(Handler<Throwable> causeHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a failed result it completes the async operation. When the returned handler is called back with a succeeded result it fails the test.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertSuccess(Handler<T> resultHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a succeeded result it invokes the `resultHandler` argument with the async result.
    `TestSuite` | TestSuite.`before(Handler<TestContext> callback)` Set a callback executed before the tests.
    `TestSuite` | TestSuite.`beforeEach(Handler<TestContext> callback)` Set a callback executed before each test and after the suite `before` callback.
    `static TestCase` | TestCase.`create(String name, Handler<TestContext> testCase)` Create a test case.
    `void` | Completion.`handler(Handler<AsyncResult<T>> completionHandler)` Completion handler to receive a completion signal when this completions completes.
    `TestSuite` | TestSuite.`test(String name, Handler<TestContext> testCase)` Add a new test case to the suite.
    `TestSuite` | TestSuite.`test(String name, int repeat, Handler<TestContext> testCase)` Add a new test case to the suite.

  - ### Uses of Handler in io.vertx.ext.unit.collect

    Methods in io.vertx.ext.unit.collect that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<Message<JsonObject>>` | EventBusCollector.`asMessageHandler()`

    Methods in io.vertx.ext.unit.collect with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static EventBusCollector` | EventBusCollector.`create(Vertx vertx, Handler<TestSuiteReport> reporter)`

  - ### Uses of Handler in io.vertx.ext.unit.report

    Methods in io.vertx.ext.unit.report with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `TestCaseReport` | TestCaseReport.`endHandler(Handler<TestResult> handler)` Set a callback for completion, the specified `handler` is invoked when the test exec has completed.
    `TestSuiteReport` | TestSuiteReport.`endHandler(Handler<Void> endHandler)`
    `TestSuiteReport` | TestSuiteReport.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler, the exception handler reports the test suite errors, it can be called mulitple times before the test ends.
    `TestSuiteReport` | TestSuiteReport.`handler(Handler<TestCaseReport> handler)`

  - ### Uses of Handler in io.vertx.ext.web

    Methods in io.vertx.ext.web with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `int` | RoutingContext.`addBodyEndHandler(Handler<Void> handler)` Provides a handler that will be called after the last part of the body is written to the wire.
    `int` | RoutingContext.`addHeadersEndHandler(Handler<Void> handler)` Add a handler that will be called just before headers are written to the response.
    `Route` | Route.`blockingHandler(Handler<RoutingContext> requestHandler)` Like `Route.blockingHandler(Handler, boolean)` called with ordered = true
    `Route` | Route.`blockingHandler(Handler<RoutingContext> requestHandler, boolean ordered)` Specify a blocking request handler for the route.
    `Router` | Router.`exceptionHandler(Handler<Throwable> exceptionHandler)` Specify a handler for any unhandled exceptions on this router.
    `Route` | Route.`failureHandler(Handler<RoutingContext> failureHandler)` Specify a failure handler for the route.
    `Route` | Route.`handler(Handler<RoutingContext> requestHandler)` Specify a request handler for the route.

  - ### Uses of Handler in io.vertx.ext.web.client

    Methods in io.vertx.ext.web.client with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | HttpRequest.`send(Handler<AsyncResult<HttpResponse<T>>> handler)` Send a request, the `handler` will receive the response as an `HttpResponse`.
    `void` | HttpRequest.`sendBuffer(Buffer body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(Handler)` but with an HTTP request `body` buffer.
    `void` | HttpRequest.`sendForm(MultiMap body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(Handler)` but with an HTTP request `body` multimap encoded as form and the content type set to `application/x-www-form-urlencoded`.
    `void` | HttpRequest.`sendJson(Object body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(Handler)` but with an HTTP request `body` object encoded as json and the content type set to `application/json`.
    `void` | HttpRequest.`sendJsonObject(JsonObject body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(Handler)` but with an HTTP request `body` object encoded as json and the content type set to `application/json`.
    `void` | HttpRequest.`sendStream(ReadStream<Buffer> body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(Handler)` but with an HTTP request `body` stream.

  - ### Uses of Handler in io.vertx.ext.web.codec

    Methods in io.vertx.ext.web.codec with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | BodyCodec.`create(Handler<AsyncResult<BodyStream<T>>> handler)` Create the `BodyStream`.

  - ### Uses of Handler in io.vertx.ext.web.codec.spi

    Subinterfaces of Handler in io.vertx.ext.web.codec.spi
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `BodyStream<T>` The body stream decodes a `WriteStream` into the a `T` instance.

  - ### Uses of Handler in io.vertx.ext.web.handler

    Subinterfaces of Handler in io.vertx.ext.web.handler
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `AuthHandler` Base interface for auth handlers.
    `interface` | `BasicAuthHandler` An auth handler that provides HTTP Basic Authentication support.
    `interface` | `BodyHandler` A handler which gathers the entire request body and sets it on the `RoutingContext`.
    `interface` | `CookieHandler` A handler which decodes cookies from the request, makes them available in the `RoutingContext` and writes them back in the response.
    `interface` | `CorsHandler` A handler which implements server side http://www.w3.org/TR/cors/[CORS] support for Vert.x-Web.
    `interface` | `CSRFHandler` This handler adds a CSRF token to requests which mutate state.
    `interface` | `DigestAuthHandler` An auth handler that provides HTTP Basic Authentication support.
    `interface` | `ErrorHandler` A pretty error handler for rendering error pages.
    `interface` | `FaviconHandler` A handler that serves favicons.
    `interface` | `FormLoginHandler` Handler that handles login from a form on a custom login page.
    `interface` | `JWTAuthHandler` An auth handler that provides JWT Authentication support.
    `interface` | `LoggerHandler` A handler which logs request information to the Vert.x logger.
    `interface` | `OAuth2AuthHandler` An auth handler that provides OAuth2 Authentication support.
    `interface` | `RedirectAuthHandler` An auth handler that's used to handle auth by redirecting user to a custom login page.
    `interface` | `ResponseContentTypeHandler` A handler which sets the response content type automatically according to the best `Accept` header match.
    `interface` | `ResponseTimeHandler` Handler which adds a header `x-response-time` in the response of matching requests containing the time taken in ms to process the request.
    `interface` | `SessionHandler` A handler that maintains a `Session` for each browser session.
    `interface` | `StaticHandler` A handler for serving static resources from the file system or classpath.
    `interface` | `TemplateHandler` A handler which renders responses using a template engine and where the template name is selected from the URI path.
    `interface` | `TimeoutHandler` Handler that will timeout requests if the response has not been written after a certain time.
    `interface` | `UserSessionHandler` This handler should be used if you want to store the User object in the Session so it's available between different requests, without you having re-authenticate each time.
    `interface` | `VirtualHostHandler` Handler that will filter requests based on the request Host name.

    Methods in io.vertx.ext.web.handler with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static VirtualHostHandler` | VirtualHostHandler.`create(String hostname, Handler<RoutingContext> handler)` Create a handler

  - ### Uses of Handler in io.vertx.ext.web.handler.sockjs

    Subinterfaces of Handler in io.vertx.ext.web.handler.sockjs
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `BridgeEvent` Represents an event that occurs on the event bus bridge.
    `interface` | `SockJSHandler` A handler that allows you to handle SockJS connections from clients.

    Methods in io.vertx.ext.web.handler.sockjs with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `SockJSHandler` | SockJSHandler.`bridge(BridgeOptions bridgeOptions, Handler<BridgeEvent> bridgeEventHandler)` Like `SockJSHandler.bridge(BridgeOptions)` but specifying a handler that will receive bridge events.
    `SockJSSocket` | SockJSSocket.`drainHandler(Handler<Void> handler)`
    `SockJSSocket` | SockJSSocket.`endHandler(Handler<Void> endHandler)`
    `SockJSSocket` | SockJSSocket.`exceptionHandler(Handler<Throwable> handler)`
    `SockJSSocket` | SockJSSocket.`handler(Handler<Buffer> handler)`
    `SockJSHandler` | SockJSHandler.`socketHandler(Handler<SockJSSocket> handler)` Set a SockJS socket handler.

  - ### Uses of Handler in io.vertx.ext.web.sstore

    Methods in io.vertx.ext.web.sstore with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | SessionStore.`clear(Handler<AsyncResult<Boolean>> resultHandler)` Remove all sessions from the store
    `void` | SessionStore.`delete(String id, Handler<AsyncResult<Boolean>> resultHandler)` Delete the session with the specified ID
    `void` | SessionStore.`get(String id, Handler<AsyncResult<Session>> resultHandler)` Get the session with the specified ID
    `void` | SessionStore.`put(Session session, Handler<AsyncResult<Boolean>> resultHandler)` Add a session with the specified ID
    `void` | SessionStore.`size(Handler<AsyncResult<Integer>> resultHandler)` Get the number of sessions in the store

  - ### Uses of Handler in io.vertx.ext.web.templ

    Methods in io.vertx.ext.web.templ with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `default void` | TemplateEngine.`render(RoutingContext context, String templateFileName, Handler<AsyncResult<Buffer>> handler)` Deprecated. use `TemplateEngine.render(RoutingContext, String, String, Handler)`
    `void` | TemplateEngine.`render(RoutingContext context, String templateDirectory, String templateFileName, Handler<AsyncResult<Buffer>> handler)` Render the template

  - ### Uses of Handler in io.vertx.grpc

    Methods in io.vertx.grpc with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `GrpcBidiExchange<I,O>` | GrpcBidiExchange.`drainHandler(Handler<Void> handler)`
    `GrpcUniExchange<O,I>` | GrpcUniExchange.`drainHandler(Handler<Void> handler)`
    `GrpcWriteStream<T>` | GrpcWriteStream.`drainHandler(Handler<Void> handler)` Set a drain handler on the stream.
    `GrpcBidiExchange<I,O>` | GrpcBidiExchange.`endHandler(Handler<Void> handler)`
    `GrpcReadStream<T>` | GrpcReadStream.`endHandler(Handler<Void> endHandler)` Set an end handler.
    `GrpcBidiExchange<I,O>` | GrpcBidiExchange.`exceptionHandler(Handler<Throwable> handler)`
    `GrpcReadStream<T>` | GrpcReadStream.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the read stream.
    `GrpcWriteStream<T>` | GrpcWriteStream.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the write stream.
    `GrpcUniExchange<O,I>` | GrpcUniExchange.`handler(Handler<AsyncResult<I>> handler)`
    `GrpcBidiExchange<I,O>` | GrpcBidiExchange.`handler(Handler<I> handler)`
    `GrpcReadStream<T>` | GrpcReadStream.`handler(Handler<T> handler)` Set a data handler.
    `VertxServer` | VertxServer.`shutdown(Handler<AsyncResult<Void>> completionHandler)`
    `VertxServer` | VertxServer.`start(Handler<AsyncResult<Void>> completionHandler)`
    `VertxChannelBuilder` | VertxChannelBuilder.`useSsl(Handler<ClientOptionsBase> handler)`
    `VertxServerBuilder` | VertxServerBuilder.`useSsl(Handler<TCPSSLOptions> handler)`

  - ### Uses of Handler in io.vertx.kafka.admin

    Methods in io.vertx.kafka.admin with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AdminUtils.`changeTopicConfig(String topicName, Map<String,String> topicConfig, Handler<AsyncResult<Void>> completionHandler)` Updates the configuration of the topic given by topicName.
    `void` | AdminUtils.`close(Handler<AsyncResult<Void>> completionHandler)` Closes the underlying connection to Zookeeper.
    `void` | AdminUtils.`createTopic(String topicName, int partitionCount, int replicationFactor, Handler<AsyncResult<Void>> completionHandler)` Creates a new Kafka topic on all Brokers managed by the given Zookeeper instance(s)
    `void` | AdminUtils.`createTopic(String topicName, int partitionCount, int replicationFactor, Map<String,String> topicConfig, Handler<AsyncResult<Void>> completionHandler)` Creates a new Kafka topic on all Brokers managed by the given Zookeeper instance(s).
    `void` | AdminUtils.`deleteTopic(String topicName, Handler<AsyncResult<Void>> completionHandler)` Delete the Kafka topic given by the topicName.
    `void` | AdminUtils.`topicExists(String topicName, Handler<AsyncResult<Boolean>> completionHandler)` Checks if the Kafka topic given by topicName does exist.

  - ### Uses of Handler in io.vertx.kafka.client.consumer

    Methods in io.vertx.kafka.client.consumer with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `KafkaConsumer<K,V>` | KafkaConsumer.`assign(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Manually assign a list of partition to this consumer.
    `KafkaReadStream<K,V>` | KafkaReadStream.`assign(Set<org.apache.kafka.common.TopicPartition> partitions, Handler<AsyncResult<Void>> completionHandler)` Manually assign a list of partition to this consumer.
    `KafkaConsumer<K,V>` | KafkaConsumer.`assign(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Manually assign a partition to this consumer.
    `KafkaConsumer<K,V>` | KafkaConsumer.`assignment(Handler<AsyncResult<Set<TopicPartition>>> handler)` Get the set of partitions currently assigned to this consumer.
    `KafkaReadStream<K,V>` | KafkaReadStream.`assignment(Handler<AsyncResult<Set<org.apache.kafka.common.TopicPartition>>> handler)` Get the set of partitions currently assigned to this consumer.
    `KafkaReadStream<K,V>` | KafkaReadStream.`batchHandler(Handler<org.apache.kafka.clients.consumer.ConsumerRecords<K,V>> handler)` Set the handler that will be called when a new batch of records is returned from Kafka.
    `KafkaConsumer<K,V>` | KafkaConsumer.`batchHandler(Handler<KafkaConsumerRecords<K,V>> handler)` Set the handler to be used when batches of messages are fetched from the Kafka server.
    `void` | KafkaConsumer.`beginningOffsets(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Map<TopicPartition,Long>>> handler)` Get the first offset for the given partitions.
    `void` | KafkaReadStream.`beginningOffsets(Set<org.apache.kafka.common.TopicPartition> topicPartitions, Handler<AsyncResult<Map<org.apache.kafka.common.TopicPartition,Long>>> handler)` Get the first offset for the given partitions.
    `void` | KafkaConsumer.`beginningOffsets(TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the first offset for the given partitions.
    `void` | KafkaReadStream.`beginningOffsets(org.apache.kafka.common.TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the first offset for the given partition.
    `void` | KafkaConsumer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the consumer
    `void` | KafkaReadStream.`close(Handler<AsyncResult<Void>> completionHandler)` Close the stream
    `void` | KafkaReadStream.`commit(Handler<AsyncResult<Map<org.apache.kafka.common.TopicPartition,org.apache.kafka.clients.consumer.OffsetAndMetadata>>> completionHandler)` Commit current offsets for all the subscribed list of topics and partition.
    `void` | KafkaConsumer.`commit(Handler<AsyncResult<Void>> completionHandler)` Commit current offsets for all the subscribed list of topics and partition.
    `void` | KafkaConsumer.`commit(Map<TopicPartition,OffsetAndMetadata> offsets, Handler<AsyncResult<Map<TopicPartition,OffsetAndMetadata>>> completionHandler)` Commit the specified offsets for the specified list of topics and partitions to Kafka.
    `void` | KafkaReadStream.`commit(Map<org.apache.kafka.common.TopicPartition,org.apache.kafka.clients.consumer.OffsetAndMetadata> offsets, Handler<AsyncResult<Map<org.apache.kafka.common.TopicPartition,org.apache.kafka.clients.consumer.OffsetAndMetadata>>> completionHandler)` Commit the specified offsets for the specified list of topics and partitions to Kafka.
    `void` | KafkaConsumer.`committed(TopicPartition topicPartition, Handler<AsyncResult<OffsetAndMetadata>> handler)` Get the last committed offset for the given partition (whether the commit happened by this process or another).
    `void` | KafkaReadStream.`committed(org.apache.kafka.common.TopicPartition topicPartition, Handler<AsyncResult<org.apache.kafka.clients.consumer.OffsetAndMetadata>> handler)` Get the last committed offset for the given partition (whether the commit happened by this process or another).
    `KafkaConsumer<K,V>` | KafkaConsumer.`endHandler(Handler<Void> endHandler)`
    `void` | KafkaConsumer.`endOffsets(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Map<TopicPartition,Long>>> handler)` Get the last offset for the given partitions.
    `void` | KafkaReadStream.`endOffsets(Set<org.apache.kafka.common.TopicPartition> topicPartitions, Handler<AsyncResult<Map<org.apache.kafka.common.TopicPartition,Long>>> handler)` Get the last offset for the given partitions.
    `void` | KafkaConsumer.`endOffsets(TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the last offset for the given partition.
    `void` | KafkaReadStream.`endOffsets(org.apache.kafka.common.TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the last offset for the given partition.
    `KafkaConsumer<K,V>` | KafkaConsumer.`exceptionHandler(Handler<Throwable> handler)`
    `KafkaConsumer<K,V>` | KafkaConsumer.`handler(Handler<KafkaConsumerRecord<K,V>> handler)`
    `KafkaConsumer<K,V>` | KafkaConsumer.`listTopics(Handler<AsyncResult<Map<String,List<PartitionInfo>>>> handler)` Get metadata about partitions for all topics that the user is authorized to view.
    `KafkaReadStream<K,V>` | KafkaReadStream.`listTopics(Handler<AsyncResult<Map<String,List<org.apache.kafka.common.PartitionInfo>>>> handler)` Get metadata about partitions for all topics that the user is authorized to view.
    `void` | KafkaConsumer.`offsetsForTimes(Map<TopicPartition,Long> topicPartitionTimestamps, Handler<AsyncResult<Map<TopicPartition,OffsetAndTimestamp>>> handler)` Look up the offsets for the given partitions by timestamp.
    `void` | KafkaReadStream.`offsetsForTimes(Map<org.apache.kafka.common.TopicPartition,Long> topicPartitionTimestamps, Handler<AsyncResult<Map<org.apache.kafka.common.TopicPartition,org.apache.kafka.clients.consumer.OffsetAndTimestamp>>> handler)` Look up the offsets for the given partitions by timestamp.
    `void` | KafkaReadStream.`offsetsForTimes(org.apache.kafka.common.TopicPartition topicPartition, long timestamp, Handler<AsyncResult<org.apache.kafka.clients.consumer.OffsetAndTimestamp>> handler)` * Look up the offset for the given partition by timestamp.
    `void` | KafkaConsumer.`offsetsForTimes(TopicPartition topicPartition, Long timestamp, Handler<AsyncResult<OffsetAndTimestamp>> handler)` Look up the offset for the given partition by timestamp.
    `KafkaConsumer<K,V>` | KafkaConsumer.`partitionsAssignedHandler(Handler<Set<TopicPartition>> handler)` Set the handler called when topic partitions are assigned to the consumer
    `KafkaReadStream<K,V>` | KafkaReadStream.`partitionsAssignedHandler(Handler<Set<org.apache.kafka.common.TopicPartition>> handler)` Set the handler called when topic partitions are assigned to the consumer
    `KafkaConsumer<K,V>` | KafkaConsumer.`partitionsFor(String topic, Handler<AsyncResult<List<PartitionInfo>>> handler)` Get metadata about the partitions for a given topic.
    `KafkaReadStream<K,V>` | KafkaReadStream.`partitionsFor(String topic, Handler<AsyncResult<List<org.apache.kafka.common.PartitionInfo>>> handler)` Get metadata about the partitions for a given topic.
    `KafkaConsumer<K,V>` | KafkaConsumer.`partitionsRevokedHandler(Handler<Set<TopicPartition>> handler)` Set the handler called when topic partitions are revoked to the consumer
    `KafkaReadStream<K,V>` | KafkaReadStream.`partitionsRevokedHandler(Handler<Set<org.apache.kafka.common.TopicPartition>> handler)` Set the handler called when topic partitions are revoked to the consumer
    `KafkaConsumer<K,V>` | KafkaConsumer.`pause(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partitions.
    `KafkaReadStream<K,V>` | KafkaReadStream.`pause(Set<org.apache.kafka.common.TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`pause(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partition.
    `void` | KafkaConsumer.`paused(Handler<AsyncResult<Set<TopicPartition>>> handler)` Get the set of partitions that were previously paused by a call to pause(Set).
    `void` | KafkaReadStream.`paused(Handler<AsyncResult<Set<org.apache.kafka.common.TopicPartition>>> handler)` Get the set of partitions that were previously paused by a call to `KafkaReadStream.pause(Set)`.
    `void` | KafkaConsumer.`position(TopicPartition partition, Handler<AsyncResult<Long>> handler)` Get the offset of the next record that will be fetched (if a record with that offset exists).
    `void` | KafkaReadStream.`position(org.apache.kafka.common.TopicPartition partition, Handler<AsyncResult<Long>> handler)` Get the offset of the next record that will be fetched (if a record with that offset exists).
    `KafkaConsumer<K,V>` | KafkaConsumer.`resume(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Resume specified partitions which have been paused with pause.
    `KafkaReadStream<K,V>` | KafkaReadStream.`resume(Set<org.apache.kafka.common.TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Resume specified partitions which have been paused with pause.
    `KafkaConsumer<K,V>` | KafkaConsumer.`resume(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Resume specified partition which have been paused with pause.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seek(TopicPartition topicPartition, long offset, Handler<AsyncResult<Void>> completionHandler)` Overrides the fetch offsets that the consumer will use on the next poll.
    `KafkaReadStream<K,V>` | KafkaReadStream.`seek(org.apache.kafka.common.TopicPartition topicPartition, long offset, Handler<AsyncResult<Void>> completionHandler)` Overrides the fetch offsets that the consumer will use on the next poll.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToBeginning(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partitions.
    `KafkaReadStream<K,V>` | KafkaReadStream.`seekToBeginning(Set<org.apache.kafka.common.TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToBeginning(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partition.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToEnd(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partitions.
    `KafkaReadStream<K,V>` | KafkaReadStream.`seekToEnd(Set<org.apache.kafka.common.TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToEnd(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partition.
    `KafkaConsumer<K,V>` | KafkaConsumer.`subscribe(Set<String> topics, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given list of topics to get dynamically assigned partitions.
    `KafkaReadStream<K,V>` | KafkaReadStream.`subscribe(Set<String> topics, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given list of topics to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`subscribe(String topic, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given topic to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`subscription(Handler<AsyncResult<Set<String>>> handler)` Get the current subscription.
    `KafkaReadStream<K,V>` | KafkaReadStream.`subscription(Handler<AsyncResult<Set<String>>> handler)` Get the current subscription.
    `KafkaConsumer<K,V>` | KafkaConsumer.`unsubscribe(Handler<AsyncResult<Void>> completionHandler)` Unsubscribe from topics currently subscribed with subscribe.
    `KafkaReadStream<K,V>` | KafkaReadStream.`unsubscribe(Handler<AsyncResult<Void>> completionHandler)` Unsubscribe from topics currently subscribed with subscribe.

  - ### Uses of Handler in io.vertx.kafka.client.producer

    Methods in io.vertx.kafka.client.producer with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | KafkaProducer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the producer
    `void` | KafkaWriteStream.`close(Handler<AsyncResult<Void>> completionHandler)` Close the stream
    `void` | KafkaProducer.`close(long timeout, Handler<AsyncResult<Void>> completionHandler)` Close the producer
    `void` | KafkaWriteStream.`close(long timeout, Handler<AsyncResult<Void>> completionHandler)` Close the stream
    `KafkaProducer<K,V>` | KafkaProducer.`drainHandler(Handler<Void> handler)`
    `KafkaProducer<K,V>` | KafkaProducer.`exceptionHandler(Handler<Throwable> handler)`
    `KafkaProducer<K,V>` | KafkaProducer.`flush(Handler<Void> completionHandler)` Invoking this method makes all buffered records immediately available to write
    `KafkaWriteStream<K,V>` | KafkaWriteStream.`flush(Handler<Void> completionHandler)` Invoking this method makes all buffered records immediately available to write
    `KafkaProducer<K,V>` | KafkaProducer.`partitionsFor(String topic, Handler<AsyncResult<List<PartitionInfo>>> handler)` Get the partition metadata for the give topic.
    `KafkaWriteStream<K,V>` | KafkaWriteStream.`partitionsFor(String topic, Handler<AsyncResult<List<org.apache.kafka.common.PartitionInfo>>> handler)` Get the partition metadata for the give topic.
    `KafkaProducer<K,V>` | KafkaProducer.`write(KafkaProducerRecord<K,V> record, Handler<AsyncResult<RecordMetadata>> handler)` Asynchronously write a record to a topic
    `KafkaWriteStream<K,V>` | KafkaWriteStream.`write(org.apache.kafka.clients.producer.ProducerRecord<K,V> record, Handler<AsyncResult<org.apache.kafka.clients.producer.RecordMetadata>> handler)` Asynchronously write a record to a topic

  - ### Uses of Handler in io.vertx.mqtt

    Methods in io.vertx.mqtt with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | MqttServer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the server supplying an handler that will be called when the server is actually closed (or has failed).
    `MqttEndpoint` | MqttEndpoint.`closeHandler(Handler<Void> handler)` Set a close handler.
    `MqttEndpoint` | MqttEndpoint.`disconnectHandler(Handler<Void> handler)` Set a disconnect handler on the MQTT endpoint.
    `MqttServer` | MqttServer.`endpointHandler(Handler<MqttEndpoint> handler)` Set the endpoint handler for the server.
    `MqttEndpoint` | MqttEndpoint.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler.
    `MqttServer` | MqttServer.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler for the server, that will be called when an error happens independantly of an accepted `MqttEndpoint`, like a rejected connection
    `MqttServer` | MqttServer.`listen(Handler<AsyncResult<MqttServer>> listenHandler)` Start the server listening for incoming connections using the specified options through the constructor
    `MqttServer` | MqttServer.`listen(int port, Handler<AsyncResult<MqttServer>> listenHandler)` Start the server listening for incoming connections on the port specified but on "0.0.0.0" as host.
    `MqttServer` | MqttServer.`listen(int port, String host, Handler<AsyncResult<MqttServer>> listenHandler)` Start the server listening for incoming connections on the port and host specified It ignores any options specified through the constructor
    `MqttEndpoint` | MqttEndpoint.`pingHandler(Handler<Void> handler)` Set the pingreq handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishAcknowledgeHandler(Handler<Integer> handler)` Set the puback handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishCompleteHandler(Handler<Integer> handler)` Set the pubcomp handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishHandler(Handler<MqttPublishMessage> handler)` Set the publish handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishReceivedHandler(Handler<Integer> handler)` Set the pubrec handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishReleaseHandler(Handler<Integer> handler)` Set the pubrel handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`subscribeHandler(Handler<MqttSubscribeMessage> handler)` Set a subscribe handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`unsubscribeHandler(Handler<MqttUnsubscribeMessage> handler)` Set a unsubscribe handler on the MQTT endpoint.

  - ### Uses of Handler in io.vertx.rabbitmq

    Methods in io.vertx.rabbitmq with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | RabbitMQClient.`basicAck(long deliveryTag, boolean multiple, Handler<AsyncResult<JsonObject>> resultHandler)` Acknowledge one or several received messages.
    `void` | RabbitMQClient.`basicConsume(String queue, String address, boolean autoAck, Handler<AsyncResult<Void>> resultHandler)` Start a non-nolocal, non-exclusive consumer, with a server-generated consumerTag.
    `void` | RabbitMQClient.`basicConsume(String queue, String address, boolean autoAck, Handler<AsyncResult<Void>> resultHandler, Handler<Throwable> errorHandler)` Start a non-nolocal, non-exclusive consumer, with a server-generated consumerTag and error handler
    `void` | RabbitMQClient.`basicConsume(String queue, String address, boolean autoAck, Handler<AsyncResult<Void>> resultHandler, Handler<Throwable> errorHandler)` Start a non-nolocal, non-exclusive consumer, with a server-generated consumerTag and error handler
    `void` | RabbitMQClient.`basicConsume(String queue, String address, Handler<AsyncResult<Void>> resultHandler)` Start a non-nolocal, non-exclusive consumer, with auto acknowledgement and a server-generated consumerTag.
    `void` | RabbitMQClient.`basicGet(String queue, boolean autoAck, Handler<AsyncResult<JsonObject>> resultHandler)` Retrieve a message from a queue using AMQP.Basic.Get
    `void` | RabbitMQClient.`basicNack(long deliveryTag, boolean multiple, boolean requeue, Handler<AsyncResult<JsonObject>> resultHandler)` Reject one or several received messages.
    `void` | RabbitMQClient.`basicPublish(String exchange, String routingKey, JsonObject message, Handler<AsyncResult<Void>> resultHandler)` Publish a message.
    `void` | RabbitMQClient.`basicQos(int prefetchCount, Handler<AsyncResult<Void>> resultHandler)` Request specific "quality of service" settings, Limiting the number of unacknowledged messages on a channel (or connection).
    `void` | RabbitMQClient.`confirmSelect(Handler<AsyncResult<Void>> resultHandler)` Enables publisher acknowledgements on this channel.
    `void` | RabbitMQClient.`exchangeBind(String destination, String source, String routingKey, Handler<AsyncResult<Void>> resultHandler)` Bind an exchange to an exchange.
    `void` | RabbitMQClient.`exchangeDeclare(String exchange, String type, boolean durable, boolean autoDelete, Handler<AsyncResult<Void>> resultHandler)` Declare an exchange.
    `void` | RabbitMQClient.`exchangeDeclare(String exchange, String type, boolean durable, boolean autoDelete, Map<String,String> config, Handler<AsyncResult<Void>> resultHandler)` Declare an exchange with additional parameters such as dead lettering or an alternate exchnage.
    `void` | RabbitMQClient.`exchangeDelete(String exchange, Handler<AsyncResult<Void>> resultHandler)` Delete an exchange, without regard for whether it is in use or not.
    `void` | RabbitMQClient.`exchangeUnbind(String destination, String source, String routingKey, Handler<AsyncResult<Void>> resultHandler)` Unbind an exchange from an exchange.
    `void` | RabbitMQClient.`messageCount(String queue, Handler<AsyncResult<JsonObject>> resultHandler)` Returns the number of messages in a queue ready to be delivered.
    `void` | RabbitMQClient.`queueBind(String queue, String exchange, String routingKey, Handler<AsyncResult<Void>> resultHandler)` Bind a queue to an exchange
    `void` | RabbitMQClient.`queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Handler<AsyncResult<JsonObject>> resultHandler)` Declare a queue
    `void` | RabbitMQClient.`queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Map<String,String> config, Handler<AsyncResult<JsonObject>> resultHandler)` Declare a queue with config options
    `void` | RabbitMQClient.`queueDeclareAuto(Handler<AsyncResult<JsonObject>> resultHandler)` Actively declare a server-named exclusive, autodelete, non-durable queue.
    `void` | RabbitMQClient.`queueDelete(String queue, Handler<AsyncResult<JsonObject>> resultHandler)` Delete a queue, without regard for whether it is in use or has messages on it
    `void` | RabbitMQClient.`queueDeleteIf(String queue, boolean ifUnused, boolean ifEmpty, Handler<AsyncResult<JsonObject>> resultHandler)` Delete a queue
    `void` | RabbitMQClient.`start(Handler<AsyncResult<Void>> resultHandler)` Start the rabbitMQ client.
    `void` | RabbitMQClient.`stop(Handler<AsyncResult<Void>> resultHandler)` Stop the rabbitMQ client.
    `void` | RabbitMQClient.`waitForConfirms(Handler<AsyncResult<Void>> resultHandler)` Wait until all messages published since the last call have been either ack'd or nack'd by the broker.
    `void` | RabbitMQClient.`waitForConfirms(long timeout, Handler<AsyncResult<Void>> resultHandler)` Wait until all messages published since the last call have been either ack'd or nack'd by the broker; or until timeout elapses.

  - ### Uses of Handler in io.vertx.redis

    Methods in io.vertx.redis with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `RedisClient` | RedisClient.`append(String key, String value, Handler<AsyncResult<Long>> handler)` Append a value to a key
    `RedisTransaction` | RedisTransaction.`append(String key, String value, Handler<AsyncResult<String>> handler)` Append a value to a key
    `RedisClient` | RedisClient.`auth(String password, Handler<AsyncResult<String>> handler)` Authenticate to the server
    `RedisTransaction` | RedisTransaction.`auth(String password, Handler<AsyncResult<String>> handler)` Authenticate to the server
    `RedisClient` | RedisClient.`bgrewriteaof(Handler<AsyncResult<String>> handler)` Asynchronously rewrite the append-only file
    `RedisTransaction` | RedisTransaction.`bgrewriteaof(Handler<AsyncResult<String>> handler)` Asynchronously rewrite the append-only file
    `RedisClient` | RedisClient.`bgsave(Handler<AsyncResult<String>> handler)` Asynchronously save the dataset to disk
    `RedisTransaction` | RedisTransaction.`bgsave(Handler<AsyncResult<String>> handler)` Asynchronously save the dataset to disk
    `RedisClient` | RedisClient.`bitcount(String key, Handler<AsyncResult<Long>> handler)` Count set bits in a string
    `RedisTransaction` | RedisTransaction.`bitcount(String key, Handler<AsyncResult<String>> handler)` Count set bits in a string
    `RedisClient` | RedisClient.`bitcountRange(String key, long start, long end, Handler<AsyncResult<Long>> handler)` Count set bits in a string
    `RedisTransaction` | RedisTransaction.`bitcountRange(String key, long start, long end, Handler<AsyncResult<String>> handler)` Count set bits in a string
    `RedisClient` | RedisClient.`bitfield(String key, BitFieldOptions bitFieldOptions, Handler<AsyncResult<JsonArray>> handler)` Perform arbitrary bitfield integer operations on strings.
    `RedisClient` | RedisClient.`bitfieldWithOverflow(String key, BitFieldOptions commands, BitFieldOverflowOptions overflow, Handler<AsyncResult<JsonArray>> handler)` Perform arbitrary bitfield integer operations on strings.
    `RedisClient` | RedisClient.`bitop(BitOperation operation, String destkey, List<String> keys, Handler<AsyncResult<Long>> handler)` Perform bitwise operations between strings
    `RedisTransaction` | RedisTransaction.`bitop(BitOperation operation, String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Perform bitwise operations between strings
    `RedisClient` | RedisClient.`bitpos(String key, int bit, Handler<AsyncResult<Long>> handler)` Find first bit set or clear in a string
    `RedisTransaction` | RedisTransaction.`bitpos(String key, int bit, Handler<AsyncResult<String>> handler)` Find first bit set or clear in a string
    `RedisClient` | RedisClient.`bitposFrom(String key, int bit, int start, Handler<AsyncResult<Long>> handler)` Find first bit set or clear in a string See also bitposRange() method, which takes start, and stop offset.
    `RedisTransaction` | RedisTransaction.`bitposFrom(String key, int bit, int start, Handler<AsyncResult<String>> handler)` Find first bit set or clear in a string
    `RedisClient` | RedisClient.`bitposRange(String key, int bit, int start, int stop, Handler<AsyncResult<Long>> handler)` Find first bit set or clear in a string Note: when both start, and stop offsets are specified, behaviour is slightly different than if only start is specified
    `RedisTransaction` | RedisTransaction.`bitposRange(String key, int bit, int start, int stop, Handler<AsyncResult<String>> handler)` Find first bit set or clear in a string
    `RedisClient` | RedisClient.`blpop(String key, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the first element in a list, or block until one is available
    `RedisTransaction` | RedisTransaction.`blpop(String key, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the first element in a list, or block until one is available
    `RedisClient` | RedisClient.`blpopMany(List<String> keys, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the first element in any of the lists, or block until one is available
    `RedisTransaction` | RedisTransaction.`blpopMany(List<String> keys, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the first element in any of the lists, or block until one is available
    `RedisClient` | RedisClient.`brpop(String key, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the last element in a list, or block until one is available
    `RedisTransaction` | RedisTransaction.`brpop(String key, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the last element in a list, or block until one is available
    `RedisClient` | RedisClient.`brpoplpush(String key, String destkey, int seconds, Handler<AsyncResult<String>> handler)` Pop a value from a list, push it to another list and return it; or block until one is available
    `RedisTransaction` | RedisTransaction.`brpoplpush(String key, String destkey, int seconds, Handler<AsyncResult<String>> handler)` Pop a value from a list, push it to another list and return it; or block until one is available
    `RedisClient` | RedisClient.`brpopMany(List<String> keys, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the last element in any of the lists, or block until one is available
    `RedisTransaction` | RedisTransaction.`brpopMany(List<String> keys, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the last element in any of the lists, or block until one is available
    `RedisClient` | RedisClient.`clientGetname(Handler<AsyncResult<String>> handler)` Get the current connection name
    `RedisTransaction` | RedisTransaction.`clientGetname(Handler<AsyncResult<String>> handler)` Get the current connection name
    `RedisClient` | RedisClient.`clientKill(KillFilter filter, Handler<AsyncResult<Long>> handler)` Kill the connection of a client
    `RedisTransaction` | RedisTransaction.`clientKill(KillFilter filter, Handler<AsyncResult<String>> handler)` Kill the connection of a client
    `RedisClient` | RedisClient.`clientList(Handler<AsyncResult<String>> handler)` Get the list of client connections
    `RedisTransaction` | RedisTransaction.`clientList(Handler<AsyncResult<String>> handler)` Get the list of client connections
    `RedisClient` | RedisClient.`clientPause(long millis, Handler<AsyncResult<String>> handler)` Stop processing commands from clients for some time
    `RedisTransaction` | RedisTransaction.`clientPause(long millis, Handler<AsyncResult<String>> handler)` Stop processing commands from clients for some time
    `RedisClient` | RedisClient.`clientReply(ClientReplyOptions options, Handler<AsyncResult<String>> handler)` Instruct the server whether to reply to commands.
    `RedisClient` | RedisClient.`clientSetname(String name, Handler<AsyncResult<String>> handler)` Set the current connection name
    `RedisTransaction` | RedisTransaction.`clientSetname(String name, Handler<AsyncResult<String>> handler)` Set the current connection name
    `void` | RedisClient.`close(Handler<AsyncResult<Void>> handler)` Close the client - when it is fully closed the handler will be called.
    `void` | RedisTransaction.`close(Handler<AsyncResult<Void>> handler)` Close the client - when it is fully closed the handler will be called.
    `RedisClient` | RedisClient.`clusterAddslots(List<Long> slots, Handler<AsyncResult<Void>> handler)` Assign new hash slots to receiving node.
    `RedisTransaction` | RedisTransaction.`clusterAddslots(List<String> slots, Handler<AsyncResult<String>> handler)` Assign new hash slots to receiving node.
    `RedisClient` | RedisClient.`clusterCountFailureReports(String nodeId, Handler<AsyncResult<Long>> handler)` Return the number of failure reports active for a given node.
    `RedisTransaction` | RedisTransaction.`clusterCountFailureReports(String nodeId, Handler<AsyncResult<String>> handler)` Return the number of failure reports active for a given node.
    `RedisClient` | RedisClient.`clusterCountkeysinslot(long slot, Handler<AsyncResult<Long>> handler)` Return the number of local keys in the specified hash slot.
    `RedisTransaction` | RedisTransaction.`clusterCountkeysinslot(long slot, Handler<AsyncResult<String>> handler)` Return the number of local keys in the specified hash slot.
    `RedisTransaction` | RedisTransaction.`clusterDelslots(long slot, Handler<AsyncResult<String>> handler)` Set hash slots as unbound in receiving node.
    `RedisClient` | RedisClient.`clusterDelslots(long slot, Handler<AsyncResult<Void>> handler)` Set hash slots as unbound in receiving node.
    `RedisClient` | RedisClient.`clusterDelslotsMany(List<Long> slots, Handler<AsyncResult<Void>> handler)` Set hash slots as unbound in receiving node.
    `RedisTransaction` | RedisTransaction.`clusterDelslotsMany(List<String> slots, Handler<AsyncResult<String>> handler)` Set hash slots as unbound in receiving node.
    `RedisTransaction` | RedisTransaction.`clusterFailover(Handler<AsyncResult<String>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisClient` | RedisClient.`clusterFailover(Handler<AsyncResult<Void>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisTransaction` | RedisTransaction.`clusterFailOverWithOptions(FailoverOptions options, Handler<AsyncResult<String>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisClient` | RedisClient.`clusterFailOverWithOptions(FailoverOptions options, Handler<AsyncResult<Void>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisTransaction` | RedisTransaction.`clusterForget(String nodeId, Handler<AsyncResult<String>> handler)` Remove a node from the nodes table.
    `RedisClient` | RedisClient.`clusterForget(String nodeId, Handler<AsyncResult<Void>> handler)` Remove a node from the nodes table.
    `RedisClient` | RedisClient.`clusterGetkeysinslot(long slot, long count, Handler<AsyncResult<JsonArray>> handler)` Return local key names in the specified hash slot.
    `RedisTransaction` | RedisTransaction.`clusterGetkeysinslot(long slot, long count, Handler<AsyncResult<String>> handler)` Return local key names in the specified hash slot.
    `RedisClient` | RedisClient.`clusterInfo(Handler<AsyncResult<JsonArray>> handler)` Provides info about Redis Cluster node state.
    `RedisTransaction` | RedisTransaction.`clusterInfo(Handler<AsyncResult<String>> handler)` Provides info about Redis Cluster node state.
    `RedisClient` | RedisClient.`clusterKeyslot(String key, Handler<AsyncResult<Long>> handler)` Returns the hash slot of the specified key.
    `RedisTransaction` | RedisTransaction.`clusterKeyslot(String key, Handler<AsyncResult<String>> handler)` Returns the hash slot of the specified key.
    `RedisTransaction` | RedisTransaction.`clusterMeet(String ip, long port, Handler<AsyncResult<String>> handler)` Force a node cluster to handshake with another node.
    `RedisClient` | RedisClient.`clusterMeet(String ip, long port, Handler<AsyncResult<Void>> handler)` Force a node cluster to handshake with another node.
    `RedisClient` | RedisClient.`clusterNodes(Handler<AsyncResult<JsonArray>> handler)` Get Cluster config for the node.
    `RedisTransaction` | RedisTransaction.`clusterNodes(Handler<AsyncResult<String>> handler)` Get Cluster config for the node.
    `RedisTransaction` | RedisTransaction.`clusterReplicate(String nodeId, Handler<AsyncResult<String>> handler)` Reconfigure a node as a slave of the specified master node.
    `RedisClient` | RedisClient.`clusterReplicate(String nodeId, Handler<AsyncResult<Void>> handler)` Reconfigure a node as a slave of the specified master node.
    `RedisTransaction` | RedisTransaction.`clusterReset(Handler<AsyncResult<String>> handler)` Reset a Redis Cluster node.
    `RedisClient` | RedisClient.`clusterReset(Handler<AsyncResult<Void>> handler)` Reset a Redis Cluster node.
    `RedisTransaction` | RedisTransaction.`clusterResetWithOptions(ResetOptions options, Handler<AsyncResult<String>> handler)` Reset a Redis Cluster node.
    `RedisClient` | RedisClient.`clusterResetWithOptions(ResetOptions options, Handler<AsyncResult<Void>> handler)` Reset a Redis Cluster node.
    `RedisTransaction` | RedisTransaction.`clusterSaveconfig(Handler<AsyncResult<String>> handler)` Forces the node to save cluster state on disk.
    `RedisClient` | RedisClient.`clusterSaveconfig(Handler<AsyncResult<Void>> handler)` Forces the node to save cluster state on disk.
    `RedisTransaction` | RedisTransaction.`clusterSetConfigEpoch(long epoch, Handler<AsyncResult<String>> handler)` Set the configuration epoch in a new node.
    `RedisClient` | RedisClient.`clusterSetConfigEpoch(long epoch, Handler<AsyncResult<Void>> handler)` Set the configuration epoch in a new node.
    `RedisTransaction` | RedisTransaction.`clusterSetslot(long slot, SlotCmd subcommand, Handler<AsyncResult<String>> handler)` Bind an hash slot to a specific node.
    `RedisClient` | RedisClient.`clusterSetslot(long slot, SlotCmd subcommand, Handler<AsyncResult<Void>> handler)` Bind an hash slot to a specific node.
    `RedisTransaction` | RedisTransaction.`clusterSetslotWithNode(long slot, SlotCmd subcommand, String nodeId, Handler<AsyncResult<String>> handler)` Bind an hash slot to a specific node.
    `RedisClient` | RedisClient.`clusterSetslotWithNode(long slot, SlotCmd subcommand, String nodeId, Handler<AsyncResult<Void>> handler)` Bind an hash slot to a specific node.
    `RedisClient` | RedisClient.`clusterSlaves(String nodeId, Handler<AsyncResult<JsonArray>> handler)` List slave nodes of the specified master node.
    `RedisTransaction` | RedisTransaction.`clusterSlaves(String nodeId, Handler<AsyncResult<String>> handler)` List slave nodes of the specified master node.
    `RedisClient` | RedisClient.`clusterSlots(Handler<AsyncResult<JsonArray>> handler)` Get array of Cluster slot to node mappings
    `RedisTransaction` | RedisTransaction.`clusterSlots(Handler<AsyncResult<String>> handler)` Get array of Cluster slot to node mappings
    `RedisClient` | RedisClient.`command(Handler<AsyncResult<JsonArray>> handler)` Get array of Redis command details
    `RedisTransaction` | RedisTransaction.`command(Handler<AsyncResult<String>> handler)` Get array of Redis command details
    `RedisClient` | RedisClient.`commandCount(Handler<AsyncResult<Long>> handler)` Get total number of Redis commands
    `RedisTransaction` | RedisTransaction.`commandCount(Handler<AsyncResult<String>> handler)` Get total number of Redis commands
    `RedisClient` | RedisClient.`commandGetkeys(Handler<AsyncResult<JsonArray>> handler)` Extract keys given a full Redis command
    `RedisTransaction` | RedisTransaction.`commandGetkeys(Handler<AsyncResult<String>> handler)` Extract keys given a full Redis command
    `RedisClient` | RedisClient.`commandInfo(List<String> commands, Handler<AsyncResult<JsonArray>> handler)` Get array of specific Redis command details
    `RedisTransaction` | RedisTransaction.`commandInfo(List<String> commands, Handler<AsyncResult<String>> handler)` Get array of specific Redis command details
    `RedisClient` | RedisClient.`configGet(String parameter, Handler<AsyncResult<JsonArray>> handler)` Get the value of a configuration parameter
    `RedisTransaction` | RedisTransaction.`configGet(String parameter, Handler<AsyncResult<String>> handler)` Get the value of a configuration parameter
    `RedisClient` | RedisClient.`configResetstat(Handler<AsyncResult<String>> handler)` Reset the stats returned by INFO
    `RedisTransaction` | RedisTransaction.`configResetstat(Handler<AsyncResult<String>> handler)` Reset the stats returned by INFO
    `RedisClient` | RedisClient.`configRewrite(Handler<AsyncResult<String>> handler)` Rewrite the configuration file with the in memory configuration
    `RedisTransaction` | RedisTransaction.`configRewrite(Handler<AsyncResult<String>> handler)` Rewrite the configuration file with the in memory configuration
    `RedisClient` | RedisClient.`configSet(String parameter, String value, Handler<AsyncResult<String>> handler)` Set a configuration parameter to the given value
    `RedisTransaction` | RedisTransaction.`configSet(String parameter, String value, Handler<AsyncResult<String>> handler)` Set a configuration parameter to the given value
    `RedisClient` | RedisClient.`dbsize(Handler<AsyncResult<Long>> handler)` Return the number of keys in the selected database
    `RedisTransaction` | RedisTransaction.`dbsize(Handler<AsyncResult<String>> handler)` Return the number of keys in the selected database
    `RedisClient` | RedisClient.`debugObject(String key, Handler<AsyncResult<String>> handler)` Get debugging information about a key
    `RedisTransaction` | RedisTransaction.`debugObject(String key, Handler<AsyncResult<String>> handler)` Get debugging information about a key
    `RedisClient` | RedisClient.`debugSegfault(Handler<AsyncResult<String>> handler)` Make the server crash
    `RedisTransaction` | RedisTransaction.`debugSegfault(Handler<AsyncResult<String>> handler)` Make the server crash
    `RedisClient` | RedisClient.`decr(String key, Handler<AsyncResult<Long>> handler)` Decrement the integer value of a key by one
    `RedisTransaction` | RedisTransaction.`decr(String key, Handler<AsyncResult<String>> handler)` Decrement the integer value of a key by one
    `RedisClient` | RedisClient.`decrby(String key, long decrement, Handler<AsyncResult<Long>> handler)` Decrement the integer value of a key by the given number
    `RedisTransaction` | RedisTransaction.`decrby(String key, long decrement, Handler<AsyncResult<String>> handler)` Decrement the integer value of a key by the given number
    `RedisClient` | RedisClient.`del(String key, Handler<AsyncResult<Long>> handler)` Delete a key
    `RedisTransaction` | RedisTransaction.`del(String key, Handler<AsyncResult<String>> handler)` Delete a key
    `RedisClient` | RedisClient.`delMany(List<String> keys, Handler<AsyncResult<Long>> handler)` Delete many keys
    `RedisTransaction` | RedisTransaction.`delMany(List<String> keys, Handler<AsyncResult<String>> handler)` Delete many keys
    `RedisTransaction` | RedisTransaction.`discard(Handler<AsyncResult<String>> handler)` Discard all commands issued after MULTI
    `RedisClient` | RedisClient.`dump(String key, Handler<AsyncResult<String>> handler)` Return a serialized version of the value stored at the specified key.
    `RedisTransaction` | RedisTransaction.`dump(String key, Handler<AsyncResult<String>> handler)` Return a serialized version of the value stored at the specified key.
    `RedisClient` | RedisClient.`echo(String message, Handler<AsyncResult<String>> handler)` Echo the given string
    `RedisTransaction` | RedisTransaction.`echo(String message, Handler<AsyncResult<String>> handler)` Echo the given string
    `RedisClient` | RedisClient.`eval(String script, List<String> keys, List<String> args, Handler<AsyncResult<JsonArray>> handler)` Execute a Lua script server side.
    `RedisTransaction` | RedisTransaction.`eval(String script, List<String> keys, List<String> args, Handler<AsyncResult<String>> handler)` Execute a Lua script server side.
    `RedisClient` | RedisClient.`evalsha(String sha1, List<String> keys, List<String> values, Handler<AsyncResult<JsonArray>> handler)` Execute a Lua script server side.
    `RedisTransaction` | RedisTransaction.`evalsha(String sha1, List<String> keys, List<String> values, Handler<AsyncResult<String>> handler)` Execute a Lua script server side.
    `RedisTransaction` | RedisTransaction.`exec(Handler<AsyncResult<JsonArray>> handler)` Execute all commands issued after MULTI
    `RedisClient` | RedisClient.`exists(String key, Handler<AsyncResult<Long>> handler)` Determine if a key exists
    `RedisTransaction` | RedisTransaction.`exists(String key, Handler<AsyncResult<String>> handler)` Determine if a key exists
    `RedisTransaction` | RedisTransaction.`expire(String key, int seconds, Handler<AsyncResult<String>> handler)` Set a key's time to live in seconds
    `RedisClient` | RedisClient.`expire(String key, long seconds, Handler<AsyncResult<Long>> handler)` Set a key's time to live in seconds
    `RedisClient` | RedisClient.`expireat(String key, long seconds, Handler<AsyncResult<Long>> handler)` Set the expiration for a key as a UNIX timestamp
    `RedisTransaction` | RedisTransaction.`expireat(String key, long seconds, Handler<AsyncResult<String>> handler)` Set the expiration for a key as a UNIX timestamp
    `RedisClient` | RedisClient.`flushall(Handler<AsyncResult<String>> handler)` Remove all keys from all databases
    `RedisTransaction` | RedisTransaction.`flushall(Handler<AsyncResult<String>> handler)` Remove all keys from all databases
    `RedisClient` | RedisClient.`flushdb(Handler<AsyncResult<String>> handler)` Remove all keys from the current database
    `RedisTransaction` | RedisTransaction.`flushdb(Handler<AsyncResult<String>> handler)` Remove all keys from the current database
    `RedisClient` | RedisClient.`geoadd(String key, double longitude, double latitude, String member, Handler<AsyncResult<Long>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisTransaction` | RedisTransaction.`geoadd(String key, double longitude, double latitude, String member, Handler<AsyncResult<String>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisClient` | RedisClient.`geoaddMany(String key, List<GeoMember> members, Handler<AsyncResult<Long>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisTransaction` | RedisTransaction.`geoaddMany(String key, List<GeoMember> members, Handler<AsyncResult<String>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisClient` | RedisClient.`geodist(String key, String member1, String member2, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`geodist(String key, String member1, String member2, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`geodistWithUnit(String key, String member1, String member2, GeoUnit unit, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`geodistWithUnit(String key, String member1, String member2, GeoUnit unit, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`geohash(String key, String member, Handler<AsyncResult<JsonArray>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisTransaction` | RedisTransaction.`geohash(String key, String member, Handler<AsyncResult<String>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisClient` | RedisClient.`geohashMany(String key, List<String> members, Handler<AsyncResult<JsonArray>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisTransaction` | RedisTransaction.`geohashMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisClient` | RedisClient.`geopos(String key, String member, Handler<AsyncResult<JsonArray>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisTransaction` | RedisTransaction.`geopos(String key, String member, Handler<AsyncResult<String>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisClient` | RedisClient.`geoposMany(String key, List<String> members, Handler<AsyncResult<JsonArray>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisTransaction` | RedisTransaction.`geoposMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisClient` | RedisClient.`georadius(String key, double longitude, double latitude, double radius, GeoUnit unit, Handler<AsyncResult<JsonArray>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisTransaction` | RedisTransaction.`georadius(String key, double longitude, double latitude, double radius, GeoUnit unit, Handler<AsyncResult<String>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisClient` | RedisClient.`georadiusbymember(String key, String member, double radius, GeoUnit unit, Handler<AsyncResult<JsonArray>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`georadiusbymember(String key, String member, double radius, GeoUnit unit, Handler<AsyncResult<String>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`georadiusbymemberWithOptions(String key, String member, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<JsonArray>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`georadiusbymemberWithOptions(String key, String member, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<String>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`georadiusWithOptions(String key, double longitude, double latitude, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<JsonArray>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisTransaction` | RedisTransaction.`georadiusWithOptions(String key, double longitude, double latitude, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<String>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisClient` | RedisClient.`get(String key, Handler<AsyncResult<String>> handler)` Get the value of a key
    `RedisTransaction` | RedisTransaction.`get(String key, Handler<AsyncResult<String>> handler)` Get the value of a key
    `RedisClient` | RedisClient.`getBinary(String key, Handler<AsyncResult<Buffer>> handler)` Get the value of a key - without decoding as utf-8
    `RedisTransaction` | RedisTransaction.`getBinary(String key, Handler<AsyncResult<String>> handler)` Get the value of a key - without decoding as utf-8
    `RedisClient` | RedisClient.`getbit(String key, long offset, Handler<AsyncResult<Long>> handler)` Returns the bit value at offset in the string value stored at key
    `RedisTransaction` | RedisTransaction.`getbit(String key, long offset, Handler<AsyncResult<String>> handler)` Returns the bit value at offset in the string value stored at key
    `RedisClient` | RedisClient.`getrange(String key, long start, long end, Handler<AsyncResult<String>> handler)` Get a substring of the string stored at a key
    `RedisTransaction` | RedisTransaction.`getrange(String key, long start, long end, Handler<AsyncResult<String>> handler)` Get a substring of the string stored at a key
    `RedisClient` | RedisClient.`getset(String key, String value, Handler<AsyncResult<String>> handler)` Set the string value of a key and return its old value
    `RedisTransaction` | RedisTransaction.`getset(String key, String value, Handler<AsyncResult<String>> handler)` Set the string value of a key and return its old value
    `RedisClient` | RedisClient.`hdel(String key, String field, Handler<AsyncResult<Long>> handler)` Delete one or more hash fields
    `RedisTransaction` | RedisTransaction.`hdel(String key, String field, Handler<AsyncResult<String>> handler)` Delete one or more hash fields
    `RedisClient` | RedisClient.`hdelMany(String key, List<String> fields, Handler<AsyncResult<Long>> handler)` Delete one or more hash fields
    `RedisTransaction` | RedisTransaction.`hdelMany(String key, List<String> fields, Handler<AsyncResult<String>> handler)` Delete one or more hash fields
    `RedisClient` | RedisClient.`hexists(String key, String field, Handler<AsyncResult<Long>> handler)` Determine if a hash field exists
    `RedisTransaction` | RedisTransaction.`hexists(String key, String field, Handler<AsyncResult<String>> handler)` Determine if a hash field exists
    `RedisClient` | RedisClient.`hget(String key, String field, Handler<AsyncResult<String>> handler)` Get the value of a hash field
    `RedisTransaction` | RedisTransaction.`hget(String key, String field, Handler<AsyncResult<String>> handler)` Get the value of a hash field
    `RedisClient` | RedisClient.`hgetall(String key, Handler<AsyncResult<JsonObject>> handler)` Get all the fields and values in a hash
    `RedisTransaction` | RedisTransaction.`hgetall(String key, Handler<AsyncResult<String>> handler)` Get all the fields and values in a hash
    `RedisClient` | RedisClient.`hincrby(String key, String field, long increment, Handler<AsyncResult<Long>> handler)` Increment the integer value of a hash field by the given number
    `RedisTransaction` | RedisTransaction.`hincrby(String key, String field, long increment, Handler<AsyncResult<String>> handler)` Increment the integer value of a hash field by the given number
    `RedisClient` | RedisClient.`hincrbyfloat(String key, String field, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a hash field by the given amount
    `RedisTransaction` | RedisTransaction.`hincrbyfloat(String key, String field, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a hash field by the given amount
    `RedisClient` | RedisClient.`hkeys(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the fields in a hash
    `RedisTransaction` | RedisTransaction.`hkeys(String key, Handler<AsyncResult<String>> handler)` Get all the fields in a hash
    `RedisClient` | RedisClient.`hlen(String key, Handler<AsyncResult<Long>> handler)` Get the number of fields in a hash
    `RedisTransaction` | RedisTransaction.`hlen(String key, Handler<AsyncResult<String>> handler)` Get the number of fields in a hash
    `RedisClient` | RedisClient.`hmget(String key, List<String> fields, Handler<AsyncResult<JsonArray>> handler)` Get the values of all the given hash fields
    `RedisTransaction` | RedisTransaction.`hmget(String key, List<String> fields, Handler<AsyncResult<String>> handler)` Get the values of all the given hash fields
    `RedisClient` | RedisClient.`hmset(String key, JsonObject values, Handler<AsyncResult<String>> handler)` Set multiple hash fields to multiple values
    `RedisTransaction` | RedisTransaction.`hmset(String key, JsonObject values, Handler<AsyncResult<String>> handler)` Set multiple hash fields to multiple values
    `RedisClient` | RedisClient.`hscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate hash fields and associated values
    `RedisTransaction` | RedisTransaction.`hscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate hash fields and associated values
    `RedisClient` | RedisClient.`hset(String key, String field, String value, Handler<AsyncResult<Long>> handler)` Set the string value of a hash field
    `RedisTransaction` | RedisTransaction.`hset(String key, String field, String value, Handler<AsyncResult<String>> handler)` Set the string value of a hash field
    `RedisClient` | RedisClient.`hsetnx(String key, String field, String value, Handler<AsyncResult<Long>> handler)` Set the value of a hash field, only if the field does not exist
    `RedisTransaction` | RedisTransaction.`hsetnx(String key, String field, String value, Handler<AsyncResult<String>> handler)` Set the value of a hash field, only if the field does not exist
    `RedisClient` | RedisClient.`hstrlen(String key, String field, Handler<AsyncResult<Long>> handler)` Get the length of the value of a hash field.
    `RedisClient` | RedisClient.`hvals(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the values in a hash
    `RedisTransaction` | RedisTransaction.`hvals(String key, Handler<AsyncResult<String>> handler)` Get all the values in a hash
    `RedisClient` | RedisClient.`incr(String key, Handler<AsyncResult<Long>> handler)` Increment the integer value of a key by one
    `RedisTransaction` | RedisTransaction.`incr(String key, Handler<AsyncResult<String>> handler)` Increment the integer value of a key by one
    `RedisClient` | RedisClient.`incrby(String key, long increment, Handler<AsyncResult<Long>> handler)` Increment the integer value of a key by the given amount
    `RedisTransaction` | RedisTransaction.`incrby(String key, long increment, Handler<AsyncResult<String>> handler)` Increment the integer value of a key by the given amount
    `RedisClient` | RedisClient.`incrbyfloat(String key, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a key by the given amount
    `RedisTransaction` | RedisTransaction.`incrbyfloat(String key, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a key by the given amount
    `RedisClient` | RedisClient.`info(Handler<AsyncResult<JsonObject>> handler)` Get information and statistics about the server
    `RedisTransaction` | RedisTransaction.`info(Handler<AsyncResult<String>> handler)` Get information and statistics about the server
    `RedisClient` | RedisClient.`infoSection(String section, Handler<AsyncResult<JsonObject>> handler)` Get information and statistics about the server
    `RedisTransaction` | RedisTransaction.`infoSection(String section, Handler<AsyncResult<String>> handler)` Get information and statistics about the server
    `RedisClient` | RedisClient.`keys(String pattern, Handler<AsyncResult<JsonArray>> handler)` Find all keys matching the given pattern
    `RedisTransaction` | RedisTransaction.`keys(String pattern, Handler<AsyncResult<String>> handler)` Find all keys matching the given pattern
    `RedisClient` | RedisClient.`lastsave(Handler<AsyncResult<Long>> handler)` Get the UNIX time stamp of the last successful save to disk
    `RedisTransaction` | RedisTransaction.`lastsave(Handler<AsyncResult<String>> handler)` Get the UNIX time stamp of the last successful save to disk
    `RedisClient` | RedisClient.`lindex(String key, int index, Handler<AsyncResult<String>> handler)` Get an element from a list by its index
    `RedisTransaction` | RedisTransaction.`lindex(String key, int index, Handler<AsyncResult<String>> handler)` Get an element from a list by its index
    `RedisClient` | RedisClient.`linsert(String key, InsertOptions option, String pivot, String value, Handler<AsyncResult<Long>> handler)` Insert an element before or after another element in a list
    `RedisTransaction` | RedisTransaction.`linsert(String key, InsertOptions option, String pivot, String value, Handler<AsyncResult<String>> handler)` Insert an element before or after another element in a list
    `RedisClient` | RedisClient.`llen(String key, Handler<AsyncResult<Long>> handler)` Get the length of a list
    `RedisTransaction` | RedisTransaction.`llen(String key, Handler<AsyncResult<String>> handler)` Get the length of a list
    `RedisClient` | RedisClient.`lpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the first element in a list
    `RedisTransaction` | RedisTransaction.`lpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the first element in a list
    `RedisClient` | RedisClient.`lpush(String key, String value, Handler<AsyncResult<Long>> handler)` Prepend one value to a list
    `RedisTransaction` | RedisTransaction.`lpush(String key, String value, Handler<AsyncResult<String>> handler)` Prepend one value to a list
    `RedisClient` | RedisClient.`lpushMany(String key, List<String> values, Handler<AsyncResult<Long>> handler)` Prepend one or multiple values to a list
    `RedisTransaction` | RedisTransaction.`lpushMany(String key, List<String> values, Handler<AsyncResult<String>> handler)` Prepend one or multiple values to a list
    `RedisClient` | RedisClient.`lpushx(String key, String value, Handler<AsyncResult<Long>> handler)` Prepend a value to a list, only if the list exists
    `RedisTransaction` | RedisTransaction.`lpushx(String key, String value, Handler<AsyncResult<String>> handler)` Prepend a value to a list, only if the list exists
    `RedisClient` | RedisClient.`lrange(String key, long from, long to, Handler<AsyncResult<JsonArray>> handler)` Get a range of elements from a list
    `RedisTransaction` | RedisTransaction.`lrange(String key, long from, long to, Handler<AsyncResult<String>> handler)` Get a range of elements from a list
    `RedisClient` | RedisClient.`lrem(String key, long count, String value, Handler<AsyncResult<Long>> handler)` Remove elements from a list
    `RedisTransaction` | RedisTransaction.`lrem(String key, long count, String value, Handler<AsyncResult<String>> handler)` Remove elements from a list
    `RedisClient` | RedisClient.`lset(String key, long index, String value, Handler<AsyncResult<String>> handler)` Set the value of an element in a list by its index
    `RedisTransaction` | RedisTransaction.`lset(String key, long index, String value, Handler<AsyncResult<String>> handler)` Set the value of an element in a list by its index
    `RedisClient` | RedisClient.`ltrim(String key, long from, long to, Handler<AsyncResult<String>> handler)` Trim a list to the specified range
    `RedisTransaction` | RedisTransaction.`ltrim(String key, long from, long to, Handler<AsyncResult<String>> handler)` Trim a list to the specified range
    `RedisClient` | RedisClient.`mget(String key, Handler<AsyncResult<JsonArray>> handler)` Get the value of the given key
    `RedisTransaction` | RedisTransaction.`mget(String key, Handler<AsyncResult<String>> handler)` Get the value of the given key
    `RedisClient` | RedisClient.`mgetMany(List<String> keys, Handler<AsyncResult<JsonArray>> handler)` Get the values of all the given keys
    `RedisTransaction` | RedisTransaction.`mgetMany(List<String> keys, Handler<AsyncResult<String>> handler)` Get the values of all the given keys
    `RedisClient` | RedisClient.`migrate(String host, int port, String key, int destdb, long timeout, MigrateOptions options, Handler<AsyncResult<String>> handler)` Atomically transfer a key from a Redis instance to another one.
    `RedisTransaction` | RedisTransaction.`migrate(String host, int port, String key, int destdb, long timeout, MigrateOptions options, Handler<AsyncResult<String>> handler)` Atomically transfer a key from a Redis instance to another one.
    `RedisTransaction` | RedisTransaction.`monitor(Handler<AsyncResult<String>> handler)` Listen for all requests received by the server in real time
    `RedisClient` | RedisClient.`monitor(Handler<AsyncResult<Void>> handler)` Listen for all requests received by the server in real time
    `RedisClient` | RedisClient.`move(String key, int destdb, Handler<AsyncResult<Long>> handler)` Move a key to another database
    `RedisTransaction` | RedisTransaction.`move(String key, int destdb, Handler<AsyncResult<String>> handler)` Move a key to another database
    `RedisClient` | RedisClient.`mset(JsonObject keyvals, Handler<AsyncResult<String>> handler)` Set multiple keys to multiple values
    `RedisTransaction` | RedisTransaction.`mset(JsonObject keyvals, Handler<AsyncResult<String>> handler)` Set multiple keys to multiple values
    `RedisClient` | RedisClient.`msetnx(JsonObject keyvals, Handler<AsyncResult<Long>> handler)` Set multiple keys to multiple values, only if none of the keys exist
    `RedisTransaction` | RedisTransaction.`msetnx(JsonObject keyvals, Handler<AsyncResult<String>> handler)` Set multiple keys to multiple values, only if none of the keys exist
    `RedisTransaction` | RedisTransaction.`multi(Handler<AsyncResult<String>> handler)` Mark the start of a RedisTransaction block
    `RedisTransaction` | RedisTransaction.`object(String key, ObjectCmd cmd, Handler<AsyncResult<String>> handler)` Inspect the internals of Redis objects
    `RedisClient` | RedisClient.`object(String key, ObjectCmd cmd, Handler<AsyncResult<Void>> handler)` Inspect the internals of Redis objects
    `RedisClient` | RedisClient.`persist(String key, Handler<AsyncResult<Long>> handler)` Remove the expiration from a key
    `RedisTransaction` | RedisTransaction.`persist(String key, Handler<AsyncResult<String>> handler)` Remove the expiration from a key
    `RedisClient` | RedisClient.`pexpire(String key, long millis, Handler<AsyncResult<Long>> handler)` Set a key's time to live in milliseconds
    `RedisTransaction` | RedisTransaction.`pexpire(String key, long millis, Handler<AsyncResult<String>> handler)` Set a key's time to live in milliseconds
    `RedisClient` | RedisClient.`pexpireat(String key, long millis, Handler<AsyncResult<Long>> handler)` Set the expiration for a key as a UNIX timestamp specified in milliseconds
    `RedisTransaction` | RedisTransaction.`pexpireat(String key, long millis, Handler<AsyncResult<String>> handler)` Set the expiration for a key as a UNIX timestamp specified in milliseconds
    `RedisClient` | RedisClient.`pfadd(String key, String element, Handler<AsyncResult<Long>> handler)` Adds the specified element to the specified HyperLogLog.
    `RedisTransaction` | RedisTransaction.`pfadd(String key, String element, Handler<AsyncResult<String>> handler)` Adds the specified element to the specified HyperLogLog.
    `RedisClient` | RedisClient.`pfaddMany(String key, List<String> elements, Handler<AsyncResult<Long>> handler)` Adds the specified elements to the specified HyperLogLog.
    `RedisTransaction` | RedisTransaction.`pfaddMany(String key, List<String> elements, Handler<AsyncResult<String>> handler)` Adds the specified elements to the specified HyperLogLog.
    `RedisClient` | RedisClient.`pfcount(String key, Handler<AsyncResult<Long>> handler)` Return the approximated cardinality of the set observed by the HyperLogLog at key.
    `RedisTransaction` | RedisTransaction.`pfcount(String key, Handler<AsyncResult<String>> handler)` Return the approximated cardinality of the set observed by the HyperLogLog at key.
    `RedisClient` | RedisClient.`pfcountMany(List<String> keys, Handler<AsyncResult<Long>> handler)` Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
    `RedisTransaction` | RedisTransaction.`pfcountMany(List<String> keys, Handler<AsyncResult<String>> handler)` Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
    `RedisClient` | RedisClient.`pfmerge(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Merge N different HyperLogLogs into a single one.
    `RedisTransaction` | RedisTransaction.`pfmerge(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Merge N different HyperLogLogs into a single one.
    `RedisClient` | RedisClient.`ping(Handler<AsyncResult<String>> handler)` Ping the server
    `RedisTransaction` | RedisTransaction.`ping(Handler<AsyncResult<String>> handler)` Ping the server
    `RedisTransaction` | RedisTransaction.`psetex(String key, long millis, String value, Handler<AsyncResult<String>> handler)` Set the value and expiration in milliseconds of a key
    `RedisClient` | RedisClient.`psetex(String key, long millis, String value, Handler<AsyncResult<Void>> handler)` Set the value and expiration in milliseconds of a key
    `RedisClient` | RedisClient.`psubscribe(String pattern, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to channels matching the given pattern
    `RedisTransaction` | RedisTransaction.`psubscribe(String pattern, Handler<AsyncResult<String>> handler)` Listen for messages published to channels matching the given pattern
    `RedisClient` | RedisClient.`psubscribeMany(List<String> patterns, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to channels matching the given patterns
    `RedisTransaction` | RedisTransaction.`psubscribeMany(List<String> patterns, Handler<AsyncResult<String>> handler)` Listen for messages published to channels matching the given patterns
    `RedisClient` | RedisClient.`pttl(String key, Handler<AsyncResult<Long>> handler)` Get the time to live for a key in milliseconds
    `RedisTransaction` | RedisTransaction.`pttl(String key, Handler<AsyncResult<String>> handler)` Get the time to live for a key in milliseconds
    `RedisClient` | RedisClient.`publish(String channel, String message, Handler<AsyncResult<Long>> handler)` Post a message to a channel
    `RedisTransaction` | RedisTransaction.`publish(String channel, String message, Handler<AsyncResult<String>> handler)` Post a message to a channel
    `RedisClient` | RedisClient.`pubsubChannels(String pattern, Handler<AsyncResult<JsonArray>> handler)` Lists the currently active channels - only those matching the pattern
    `RedisTransaction` | RedisTransaction.`pubsubChannels(String pattern, Handler<AsyncResult<String>> handler)` Lists the currently active channels - only those matching the pattern
    `RedisClient` | RedisClient.`pubsubNumpat(Handler<AsyncResult<Long>> handler)` Returns the number of subscriptions to patterns (that are performed using the PSUBSCRIBE command)
    `RedisTransaction` | RedisTransaction.`pubsubNumpat(Handler<AsyncResult<String>> handler)` Returns the number of subscriptions to patterns (that are performed using the PSUBSCRIBE command)
    `RedisClient` | RedisClient.`pubsubNumsub(List<String> channels, Handler<AsyncResult<JsonArray>> handler)` Returns the number of subscribers (not counting clients subscribed to patterns) for the specified channels
    `RedisTransaction` | RedisTransaction.`pubsubNumsub(List<String> channels, Handler<AsyncResult<String>> handler)` Returns the number of subscribers (not counting clients subscribed to patterns) for the specified channels
    `RedisTransaction` | RedisTransaction.`punsubscribe(List<String> patterns, Handler<AsyncResult<String>> handler)` Stop listening for messages posted to channels matching the given patterns
    `RedisClient` | RedisClient.`punsubscribe(List<String> patterns, Handler<AsyncResult<Void>> handler)` Stop listening for messages posted to channels matching the given patterns
    `RedisClient` | RedisClient.`randomkey(Handler<AsyncResult<String>> handler)` Return a random key from the keyspace
    `RedisTransaction` | RedisTransaction.`randomkey(Handler<AsyncResult<String>> handler)` Return a random key from the keyspace
    `RedisClient` | RedisClient.`rename(String key, String newkey, Handler<AsyncResult<String>> handler)` Rename a key
    `RedisTransaction` | RedisTransaction.`rename(String key, String newkey, Handler<AsyncResult<String>> handler)` Rename a key
    `RedisClient` | RedisClient.`renamenx(String key, String newkey, Handler<AsyncResult<Long>> handler)` Rename a key, only if the new key does not exist
    `RedisTransaction` | RedisTransaction.`renamenx(String key, String newkey, Handler<AsyncResult<String>> handler)` Rename a key, only if the new key does not exist
    `RedisClient` | RedisClient.`restore(String key, long millis, String serialized, Handler<AsyncResult<String>> handler)` Create a key using the provided serialized value, previously obtained using DUMP.
    `RedisTransaction` | RedisTransaction.`restore(String key, long millis, String serialized, Handler<AsyncResult<String>> handler)` Create a key using the provided serialized value, previously obtained using DUMP.
    `RedisClient` | RedisClient.`role(Handler<AsyncResult<JsonArray>> handler)` Return the role of the instance in the context of replication
    `RedisTransaction` | RedisTransaction.`role(Handler<AsyncResult<String>> handler)` Return the role of the instance in the context of replication
    `RedisClient` | RedisClient.`rpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the last element in a list
    `RedisTransaction` | RedisTransaction.`rpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the last element in a list
    `RedisClient` | RedisClient.`rpoplpush(String key, String destkey, Handler<AsyncResult<String>> handler)` Remove the last element in a list, append it to another list and return it
    `RedisTransaction` | RedisTransaction.`rpoplpush(String key, String destkey, Handler<AsyncResult<String>> handler)` Remove the last element in a list, append it to another list and return it
    `RedisClient` | RedisClient.`rpush(String key, String value, Handler<AsyncResult<Long>> handler)` Append one or multiple values to a list
    `RedisTransaction` | RedisTransaction.`rpush(String key, String value, Handler<AsyncResult<String>> handler)` Append one or multiple values to a list
    `RedisClient` | RedisClient.`rpushMany(String key, List<String> values, Handler<AsyncResult<Long>> handler)` Append one or multiple values to a list
    `RedisTransaction` | RedisTransaction.`rpushMany(String key, List<String> values, Handler<AsyncResult<String>> handler)` Append one or multiple values to a list
    `RedisClient` | RedisClient.`rpushx(String key, String value, Handler<AsyncResult<Long>> handler)` Append a value to a list, only if the list exists
    `RedisTransaction` | RedisTransaction.`rpushx(String key, String value, Handler<AsyncResult<String>> handler)` Append a value to a list, only if the list exists
    `RedisClient` | RedisClient.`sadd(String key, String member, Handler<AsyncResult<Long>> handler)` Add a member to a set
    `RedisTransaction` | RedisTransaction.`sadd(String key, String member, Handler<AsyncResult<String>> handler)` Add a member to a set
    `RedisClient` | RedisClient.`saddMany(String key, List<String> members, Handler<AsyncResult<Long>> handler)` Add one or more members to a set
    `RedisTransaction` | RedisTransaction.`saddMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Add one or more members to a set
    `RedisClient` | RedisClient.`save(Handler<AsyncResult<String>> handler)` Synchronously save the dataset to disk
    `RedisTransaction` | RedisTransaction.`save(Handler<AsyncResult<String>> handler)` Synchronously save the dataset to disk
    `RedisClient` | RedisClient.`scan(String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate the keys space
    `RedisTransaction` | RedisTransaction.`scan(String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate the keys space
    `RedisClient` | RedisClient.`scard(String key, Handler<AsyncResult<Long>> handler)` Get the number of members in a set
    `RedisTransaction` | RedisTransaction.`scard(String key, Handler<AsyncResult<String>> handler)` Get the number of members in a set
    `RedisClient` | RedisClient.`scriptDebug(ScriptDebugOptions scriptDebugOptions, Handler<AsyncResult<String>> handler)` Set the debug mode for executed scripts.
    `RedisClient` | RedisClient.`scriptExists(String script, Handler<AsyncResult<JsonArray>> handler)` Check existence of script in the script cache.
    `RedisTransaction` | RedisTransaction.`scriptExists(String script, Handler<AsyncResult<String>> handler)` Check existence of script in the script cache.
    `RedisClient` | RedisClient.`scriptExistsMany(List<String> scripts, Handler<AsyncResult<JsonArray>> handler)` Check existence of scripts in the script cache.
    `RedisTransaction` | RedisTransaction.`scriptExistsMany(List<String> scripts, Handler<AsyncResult<String>> handler)` Check existence of scripts in the script cache.
    `RedisClient` | RedisClient.`scriptFlush(Handler<AsyncResult<String>> handler)` Remove all the scripts from the script cache.
    `RedisTransaction` | RedisTransaction.`scriptFlush(Handler<AsyncResult<String>> handler)` Remove all the scripts from the script cache.
    `RedisClient` | RedisClient.`scriptKill(Handler<AsyncResult<String>> handler)` Kill the script currently in execution.
    `RedisTransaction` | RedisTransaction.`scriptKill(Handler<AsyncResult<String>> handler)` Kill the script currently in execution.
    `RedisClient` | RedisClient.`scriptLoad(String script, Handler<AsyncResult<String>> handler)` Load the specified Lua script into the script cache.
    `RedisTransaction` | RedisTransaction.`scriptLoad(String script, Handler<AsyncResult<String>> handler)` Load the specified Lua script into the script cache.
    `RedisClient` | RedisClient.`sdiff(String key, List<String> cmpkeys, Handler<AsyncResult<JsonArray>> handler)` Subtract multiple sets
    `RedisTransaction` | RedisTransaction.`sdiff(String key, List<String> cmpkeys, Handler<AsyncResult<String>> handler)` Subtract multiple sets
    `RedisClient` | RedisClient.`sdiffstore(String destkey, String key, List<String> cmpkeys, Handler<AsyncResult<Long>> handler)` Subtract multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sdiffstore(String destkey, String key, List<String> cmpkeys, Handler<AsyncResult<String>> handler)` Subtract multiple sets and store the resulting set in a key
    `RedisClient` | RedisClient.`select(int dbindex, Handler<AsyncResult<String>> handler)` Change the selected database for the current connection
    `RedisTransaction` | RedisTransaction.`select(int dbindex, Handler<AsyncResult<String>> handler)` Change the selected database for the current connection
    `RedisTransaction` | RedisTransaction.`set(String key, String value, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`set(String key, String value, Handler<AsyncResult<Void>> handler)` Set the string value of a key
    `RedisTransaction` | RedisTransaction.`setBinary(String key, Buffer value, Handler<AsyncResult<String>> handler)` Set the binary string value of a key - without encoding as utf-8
    `RedisClient` | RedisClient.`setBinary(String key, Buffer value, Handler<AsyncResult<Void>> handler)` Set the binary string value of a key - without encoding as utf-8
    `RedisTransaction` | RedisTransaction.`setBinaryWithOptions(String key, Buffer value, SetOptions options, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`setBinaryWithOptions(String key, Buffer value, SetOptions options, Handler<AsyncResult<Void>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`setbit(String key, long offset, int bit, Handler<AsyncResult<Long>> handler)` Sets or clears the bit at offset in the string value stored at key
    `RedisTransaction` | RedisTransaction.`setbit(String key, long offset, int bit, Handler<AsyncResult<String>> handler)` Sets or clears the bit at offset in the string value stored at key
    `RedisClient` | RedisClient.`setex(String key, long seconds, String value, Handler<AsyncResult<String>> handler)` Set the value and expiration of a key
    `RedisTransaction` | RedisTransaction.`setex(String key, long seconds, String value, Handler<AsyncResult<String>> handler)` Set the value and expiration of a key
    `RedisClient` | RedisClient.`setnx(String key, String value, Handler<AsyncResult<Long>> handler)` Set the value of a key, only if the key does not exist
    `RedisTransaction` | RedisTransaction.`setnx(String key, String value, Handler<AsyncResult<String>> handler)` Set the value of a key, only if the key does not exist
    `RedisClient` | RedisClient.`setrange(String key, int offset, String value, Handler<AsyncResult<Long>> handler)` Overwrite part of a string at key starting at the specified offset
    `RedisTransaction` | RedisTransaction.`setrange(String key, int offset, String value, Handler<AsyncResult<String>> handler)` Overwrite part of a string at key starting at the specified offset
    `RedisClient` | RedisClient.`setWithOptions(String key, String value, SetOptions options, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisTransaction` | RedisTransaction.`setWithOptions(String key, String value, SetOptions options, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`sinter(List<String> keys, Handler<AsyncResult<JsonArray>> handler)` Intersect multiple sets
    `RedisTransaction` | RedisTransaction.`sinter(List<String> keys, Handler<AsyncResult<String>> handler)` Intersect multiple sets
    `RedisClient` | RedisClient.`sinterstore(String destkey, List<String> keys, Handler<AsyncResult<Long>> handler)` Intersect multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sinterstore(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Intersect multiple sets and store the resulting set in a key
    `RedisClient` | RedisClient.`sismember(String key, String member, Handler<AsyncResult<Long>> handler)` Determine if a given value is a member of a set
    `RedisTransaction` | RedisTransaction.`sismember(String key, String member, Handler<AsyncResult<String>> handler)` Determine if a given value is a member of a set
    `RedisClient` | RedisClient.`slaveof(String host, int port, Handler<AsyncResult<String>> handler)` Make the server a slave of another instance
    `RedisTransaction` | RedisTransaction.`slaveof(String host, int port, Handler<AsyncResult<String>> handler)` Make the server a slave of another instance
    `RedisClient` | RedisClient.`slaveofNoone(Handler<AsyncResult<String>> handler)` Make this server a master
    `RedisTransaction` | RedisTransaction.`slaveofNoone(Handler<AsyncResult<String>> handler)` Make this server a master
    `RedisClient` | RedisClient.`slowlogGet(int limit, Handler<AsyncResult<JsonArray>> handler)` Read the Redis slow queries log
    `RedisTransaction` | RedisTransaction.`slowlogGet(int limit, Handler<AsyncResult<String>> handler)` Read the Redis slow queries log
    `RedisClient` | RedisClient.`slowlogLen(Handler<AsyncResult<Long>> handler)` Get the length of the Redis slow queries log
    `RedisTransaction` | RedisTransaction.`slowlogLen(Handler<AsyncResult<String>> handler)` Get the length of the Redis slow queries log
    `RedisTransaction` | RedisTransaction.`slowlogReset(Handler<AsyncResult<String>> handler)` Reset the Redis slow queries log
    `RedisClient` | RedisClient.`slowlogReset(Handler<AsyncResult<Void>> handler)` Reset the Redis slow queries log
    `RedisClient` | RedisClient.`smembers(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the members in a set
    `RedisTransaction` | RedisTransaction.`smembers(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the members in a set
    `RedisClient` | RedisClient.`smove(String key, String destkey, String member, Handler<AsyncResult<Long>> handler)` Move a member from one set to another
    `RedisTransaction` | RedisTransaction.`smove(String key, String destkey, String member, Handler<AsyncResult<String>> handler)` Move a member from one set to another
    `RedisClient` | RedisClient.`sort(String key, SortOptions options, Handler<AsyncResult<JsonArray>> handler)` Sort the elements in a list, set or sorted set
    `RedisTransaction` | RedisTransaction.`sort(String key, SortOptions options, Handler<AsyncResult<String>> handler)` Sort the elements in a list, set or sorted set
    `RedisClient` | RedisClient.`spop(String key, Handler<AsyncResult<String>> handler)` Remove and return a random member from a set
    `RedisTransaction` | RedisTransaction.`spop(String key, Handler<AsyncResult<String>> handler)` Remove and return a random member from a set
    `RedisClient` | RedisClient.`spopMany(String key, int count, Handler<AsyncResult<JsonArray>> handler)` Remove and return random members from a set
    `RedisTransaction` | RedisTransaction.`spopMany(String key, int count, Handler<AsyncResult<String>> handler)` Remove and return random members from a set
    `RedisClient` | RedisClient.`srandmember(String key, Handler<AsyncResult<String>> handler)` Get one or multiple random members from a set
    `RedisTransaction` | RedisTransaction.`srandmember(String key, Handler<AsyncResult<String>> handler)` Get one or multiple random members from a set
    `RedisClient` | RedisClient.`srandmemberCount(String key, int count, Handler<AsyncResult<JsonArray>> handler)` Get one or multiple random members from a set
    `RedisTransaction` | RedisTransaction.`srandmemberCount(String key, int count, Handler<AsyncResult<String>> handler)` Get one or multiple random members from a set
    `RedisClient` | RedisClient.`srem(String key, String member, Handler<AsyncResult<Long>> handler)` Remove one member from a set
    `RedisTransaction` | RedisTransaction.`srem(String key, String member, Handler<AsyncResult<String>> handler)` Remove one member from a set
    `RedisClient` | RedisClient.`sremMany(String key, List<String> members, Handler<AsyncResult<Long>> handler)` Remove one or more members from a set
    `RedisTransaction` | RedisTransaction.`sremMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Remove one or more members from a set
    `RedisClient` | RedisClient.`sscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate Set elements
    `RedisTransaction` | RedisTransaction.`sscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate Set elements
    `RedisClient` | RedisClient.`strlen(String key, Handler<AsyncResult<Long>> handler)` Get the length of the value stored in a key
    `RedisTransaction` | RedisTransaction.`strlen(String key, Handler<AsyncResult<String>> handler)` Get the length of the value stored in a key
    `RedisClient` | RedisClient.`subscribe(String channel, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to the given channels
    `RedisTransaction` | RedisTransaction.`subscribe(String channel, Handler<AsyncResult<String>> handler)` Listen for messages published to the given channels
    `RedisClient` | RedisClient.`subscribeMany(List<String> channels, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to the given channels
    `RedisTransaction` | RedisTransaction.`subscribeMany(List<String> channels, Handler<AsyncResult<String>> handler)` Listen for messages published to the given channels
    `RedisClient` | RedisClient.`sunion(List<String> keys, Handler<AsyncResult<JsonArray>> handler)` Add multiple sets
    `RedisTransaction` | RedisTransaction.`sunion(List<String> keys, Handler<AsyncResult<String>> handler)` Add multiple sets
    `RedisClient` | RedisClient.`sunionstore(String destkey, List<String> keys, Handler<AsyncResult<Long>> handler)` Add multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sunionstore(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Add multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sync(Handler<AsyncResult<String>> handler)` Internal command used for replication
    `RedisClient` | RedisClient.`sync(Handler<AsyncResult<Void>> handler)` Internal command used for replication
    `RedisClient` | RedisClient.`time(Handler<AsyncResult<JsonArray>> handler)` Return the current server time
    `RedisTransaction` | RedisTransaction.`time(Handler<AsyncResult<String>> handler)` Return the current server time
    `RedisClient` | RedisClient.`touch(String key, Handler<AsyncResult<Long>> handler)` Alters the last access time of a key(s).
    `RedisClient` | RedisClient.`touchMany(List<String> keys, Handler<AsyncResult<Long>> handler)` Alters the last access time of a key(s).
    `RedisClient` | RedisClient.`ttl(String key, Handler<AsyncResult<Long>> handler)` Get the time to live for a key
    `RedisTransaction` | RedisTransaction.`ttl(String key, Handler<AsyncResult<String>> handler)` Get the time to live for a key
    `RedisClient` | RedisClient.`type(String key, Handler<AsyncResult<String>> handler)` Determine the type stored at key
    `RedisTransaction` | RedisTransaction.`type(String key, Handler<AsyncResult<String>> handler)` Determine the type stored at key
    `RedisTransaction` | RedisTransaction.`unsubscribe(List<String> channels, Handler<AsyncResult<String>> handler)` Stop listening for messages posted to the given channels
    `RedisClient` | RedisClient.`unsubscribe(List<String> channels, Handler<AsyncResult<Void>> handler)` Stop listening for messages posted to the given channels
    `RedisTransaction` | RedisTransaction.`unwatch(Handler<AsyncResult<String>> handler)` Forget about all watched keys
    `RedisClient` | RedisClient.`wait(long numSlaves, long timeout, Handler<AsyncResult<String>> handler)` Wait for the synchronous replication of all the write commands sent in the context of the current connection.
    `RedisTransaction` | RedisTransaction.`wait(long numSlaves, long timeout, Handler<AsyncResult<String>> handler)` Wait for the synchronous replication of all the write commands sent in the context of the current connection.
    `RedisTransaction` | RedisTransaction.`watch(String key, Handler<AsyncResult<String>> handler)` Watch the given keys to determine execution of the MULTI/EXEC block
    `RedisTransaction` | RedisTransaction.`watchMany(List<String> keys, Handler<AsyncResult<String>> handler)` Watch the given keys to determine execution of the MULTI/EXEC block
    `RedisClient` | RedisClient.`zadd(String key, double score, String member, Handler<AsyncResult<Long>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisTransaction` | RedisTransaction.`zadd(String key, double score, String member, Handler<AsyncResult<String>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisClient` | RedisClient.`zaddMany(String key, Map<String,Double> members, Handler<AsyncResult<Long>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisTransaction` | RedisTransaction.`zaddMany(String key, Map<String,Double> members, Handler<AsyncResult<String>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisClient` | RedisClient.`zcard(String key, Handler<AsyncResult<Long>> handler)` Get the number of members in a sorted set
    `RedisTransaction` | RedisTransaction.`zcard(String key, Handler<AsyncResult<String>> handler)` Get the number of members in a sorted set
    `RedisClient` | RedisClient.`zcount(String key, double min, double max, Handler<AsyncResult<Long>> handler)` Count the members in a sorted set with scores within the given values
    `RedisTransaction` | RedisTransaction.`zcount(String key, double min, double max, Handler<AsyncResult<String>> handler)` Count the members in a sorted set with scores within the given values
    `RedisClient` | RedisClient.`zincrby(String key, double increment, String member, Handler<AsyncResult<String>> handler)` Increment the score of a member in a sorted set
    `RedisTransaction` | RedisTransaction.`zincrby(String key, double increment, String member, Handler<AsyncResult<String>> handler)` Increment the score of a member in a sorted set
    `RedisClient` | RedisClient.`zinterstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key
    `RedisTransaction` | RedisTransaction.`zinterstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key
    `RedisClient` | RedisClient.`zinterstoreWeighed(String destkey, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key using weights for scoring
    `RedisTransaction` | RedisTransaction.`zinterstoreWeighed(String destkey, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key using weights for scoring
    `RedisClient` | RedisClient.`zlexcount(String key, String min, String max, Handler<AsyncResult<Long>> handler)` Count the number of members in a sorted set between a given lexicographical range
    `RedisTransaction` | RedisTransaction.`zlexcount(String key, String min, String max, Handler<AsyncResult<String>> handler)` Count the number of members in a sorted set between a given lexicographical range
    `RedisClient` | RedisClient.`zrange(String key, long start, long stop, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by index
    `RedisTransaction` | RedisTransaction.`zrange(String key, long start, long stop, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by index
    `RedisClient` | RedisClient.`zrangebylex(String key, String min, String max, LimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by lexicographical range
    `RedisTransaction` | RedisTransaction.`zrangebylex(String key, String min, String max, LimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by lexicographical range
    `RedisClient` | RedisClient.`zrangebyscore(String key, String min, String max, RangeLimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by score
    `RedisTransaction` | RedisTransaction.`zrangebyscore(String key, String min, String max, RangeLimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by score
    `RedisClient` | RedisClient.`zrangeWithOptions(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by index
    `RedisTransaction` | RedisTransaction.`zrangeWithOptions(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by index
    `RedisClient` | RedisClient.`zrank(String key, String member, Handler<AsyncResult<Long>> handler)` Determine the index of a member in a sorted set
    `RedisTransaction` | RedisTransaction.`zrank(String key, String member, Handler<AsyncResult<String>> handler)` Determine the index of a member in a sorted set
    `RedisClient` | RedisClient.`zrem(String key, String member, Handler<AsyncResult<Long>> handler)` Remove one member from a sorted set
    `RedisTransaction` | RedisTransaction.`zrem(String key, String member, Handler<AsyncResult<String>> handler)` Remove one member from a sorted set
    `RedisClient` | RedisClient.`zremMany(String key, List<String> members, Handler<AsyncResult<Long>> handler)` Remove one or more members from a sorted set
    `RedisTransaction` | RedisTransaction.`zremMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Remove one or more members from a sorted set
    `RedisClient` | RedisClient.`zremrangebylex(String key, String min, String max, Handler<AsyncResult<Long>> handler)` Remove all members in a sorted set between the given lexicographical range
    `RedisTransaction` | RedisTransaction.`zremrangebylex(String key, String min, String max, Handler<AsyncResult<String>> handler)` Remove all members in a sorted set between the given lexicographical range
    `RedisClient` | RedisClient.`zremrangebyrank(String key, long start, long stop, Handler<AsyncResult<Long>> handler)` Remove all members in a sorted set within the given indexes
    `RedisTransaction` | RedisTransaction.`zremrangebyrank(String key, long start, long stop, Handler<AsyncResult<String>> handler)` Remove all members in a sorted set within the given indexes
    `RedisClient` | RedisClient.`zremrangebyscore(String key, String min, String max, Handler<AsyncResult<Long>> handler)` Remove all members in a sorted set within the given scores
    `RedisTransaction` | RedisTransaction.`zremrangebyscore(String key, String min, String max, Handler<AsyncResult<String>> handler)` Remove all members in a sorted set within the given scores
    `RedisClient` | RedisClient.`zrevrange(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by index, with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrange(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by index, with scores ordered from high to low
    `RedisClient` | RedisClient.`zrevrangebylex(String key, String max, String min, LimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by score, between the given lexicographical range with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrangebylex(String key, String max, String min, LimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by score, between the given lexicographical range with scores ordered from high to low
    `RedisClient` | RedisClient.`zrevrangebyscore(String key, String max, String min, RangeLimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by score, with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrangebyscore(String key, String max, String min, RangeLimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by score, with scores ordered from high to low
    `RedisClient` | RedisClient.`zrevrank(String key, String member, Handler<AsyncResult<Long>> handler)` Determine the index of a member in a sorted set, with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrank(String key, String member, Handler<AsyncResult<String>> handler)` Determine the index of a member in a sorted set, with scores ordered from high to low
    `RedisClient` | RedisClient.`zscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate sorted sets elements and associated scores
    `RedisTransaction` | RedisTransaction.`zscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate sorted sets elements and associated scores
    `RedisClient` | RedisClient.`zscore(String key, String member, Handler<AsyncResult<String>> handler)` Get the score associated with the given member in a sorted set
    `RedisTransaction` | RedisTransaction.`zscore(String key, String member, Handler<AsyncResult<String>> handler)` Get the score associated with the given member in a sorted set
    `RedisClient` | RedisClient.`zunionstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Add multiple sorted sets and store the resulting sorted set in a new key
    `RedisTransaction` | RedisTransaction.`zunionstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Add multiple sorted sets and store the resulting sorted set in a new key
    `RedisClient` | RedisClient.`zunionstoreWeighed(String key, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Add multiple sorted sets using weights, and store the resulting sorted set in a new key
    `RedisTransaction` | RedisTransaction.`zunionstoreWeighed(String key, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Add multiple sorted sets using weights, and store the resulting sorted set in a new key

  - ### Uses of Handler in io.vertx.rx.java

    Classes in io.vertx.rx.java that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `HandlerAdapter<T>`

    Fields in io.vertx.rx.java with type parameters of type Handler
    Modifier and Type | Field and Description
    --- | ---
    `protected java.util.function.Consumer<Handler<AsyncResult<T>>>` | SingleOnSubscribeAdapter.`consumer`

    Methods in io.vertx.rx.java that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `static <T> Handler<AsyncResult<T>>` | RxHelper.`toFuture(rx.functions.Action1<T> onNext)` Adapt an item callback as a `Handler<AsyncResult<T>>`.
    `static <T> Handler<AsyncResult<T>>` | RxHelper.`toFuture(rx.functions.Action1<T> onNext, rx.functions.Action1<Throwable> onError)` Adapt an item callback and an error callback as a `Handler<AsyncResult<T>>`.
    `static <T> Handler<AsyncResult<T>>` | RxHelper.`toFuture(rx.functions.Action1<T> onNext, rx.functions.Action1<Throwable> onError, rx.functions.Action0 onComplete)` Adapt an item callback and an error callback as a `Handler<AsyncResult<T>>`.
    `static <T> Handler<AsyncResult<T>>` | RxHelper.`toFuture(rx.Observer<T> observer)` Adapt a `Subscriber` as a `Handler<AsyncResult<T>>;`.
    `Handler<AsyncResult<T>>` | ObservableFuture.`toHandler()`
    `Handler<T>` | ObservableHandler.`toHandler()`
    `static <T> Handler<T>` | RxHelper.`toHandler(rx.functions.Action1<T> onNext)` Adapt an item callback as a `Handler<T>`.
    `static <T> Handler<T>` | RxHelper.`toHandler(rx.Observer<T> observer)` Adapt a `Subscriber` as a `Handler<T>;`. When the event handler completes, the observer will complete immediatly after the event is received, as a single event is expected.
    `static <T> Handler<T>` | RxHelper.`toHandler(rx.Observer<T> observer, boolean multi)` Adapt a `Subscriber` as a `Handler<T>;`. When parameter is false and the event handler completes, the observer will complete immediatly after the event is received, as a single event is expected.

    Methods in io.vertx.rx.java with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `ReadStream<J>` | ReadStreamSubscriber.`endHandler(Handler<Void> handler)`
    `ReadStream<J>` | ReadStreamSubscriber.`exceptionHandler(Handler<Throwable> handler)`
    `ReadStream<J>` | ReadStreamSubscriber.`handler(Handler<J> handler)`
    `static <T> rx.Subscriber<T>` | RxHelper.`toSubscriber(Handler<AsyncResult<T>> handler)` Adapts an Vert.x `Handler<AsyncResult<T>>` to an RxJava `Subscriber`.

    Constructor parameters in io.vertx.rx.java with type arguments of type Handler
    Constructor and Description
    `SingleOnSubscribeAdapter(java.util.function.Consumer<Handler<AsyncResult<T>>> consumer)`

  - ### Uses of Handler in io.vertx.rxjava.amqpbridge

    Methods in io.vertx.rxjava.amqpbridge with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AmqpBridge.`close(Handler<AsyncResult<Void>> resultHandler)` Shuts the bridge down, closing the underlying connection.
    `void` | AmqpBridge.`endHandler(Handler<Void> endHandler)` Set an end handler.
    `void` | AmqpBridge.`start(String hostname, int port, Handler<AsyncResult<AmqpBridge>> resultHandler)` Starts the bridge, establishing the underlying connection.
    `void` | AmqpBridge.`start(String hostname, int port, String username, String password, Handler<AsyncResult<AmqpBridge>> resultHandler)` Starts the bridge, establishing the underlying connection.

  - ### Uses of Handler in io.vertx.rxjava.circuitbreaker

    Classes in io.vertx.rxjava.circuitbreaker that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `HystrixMetricHandler` A Vert.x web handler to expose the circuit breaker to the Hystrix dasbboard.

    Methods in io.vertx.rxjava.circuitbreaker with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `CircuitBreaker` | CircuitBreaker.`closeHandler(Handler<Void> handler)` Sets a invoked when the circuit breaker state switches to close.
    `<T> Future<T>` | CircuitBreaker.`execute(Handler<Future<T>> command)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using the circuit breaker default fallback.
    `<T> CircuitBreaker` | CircuitBreaker.`executeAndReport(Future<T> resultFuture, Handler<Future<T>> command)` Same as `CircuitBreaker.executeAndReportWithFallback(io.vertx.rxjava.core.Future<T>, io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using the circuit breaker default fallback.
    `<T> CircuitBreaker` | CircuitBreaker.`executeAndReportWithFallback(Future<T> resultFuture, Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback)` Executes the given operation with the circuit breaker control.
    `<T> void` | CircuitBreaker.`executeCommand(Handler<Future<T>> command, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using the circuit breaker default fallback.
    `<T> void` | CircuitBreaker.`executeCommand(Handler<Future<T>> command, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using the circuit breaker default fallback.
    `<T> rx.Observable<T>` | CircuitBreaker.`executeCommandObservable(Handler<Future<T>> command)` Deprecated. use `CircuitBreaker.rxExecuteCommand(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>)` instead
    `<T> void` | CircuitBreaker.`executeCommandWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using a callback.
    `<T> void` | CircuitBreaker.`executeCommandWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback, Handler<AsyncResult<T>> handler)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using a callback.
    `<T> rx.Observable<T>` | CircuitBreaker.`executeCommandWithFallbackObservable(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback)` Deprecated. use `CircuitBreaker.rxExecuteCommandWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` instead
    `<T> Future<T>` | CircuitBreaker.`executeWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback)` Executes the given operation with the circuit breaker control.
    `CircuitBreaker` | CircuitBreaker.`halfOpenHandler(Handler<Void> handler)` Sets a invoked when the circuit breaker state switches to half-open.
    `CircuitBreaker` | CircuitBreaker.`openHandler(Handler<Void> handler)` Sets a invoked when the circuit breaker state switches to open.
    `<T> rx.Single<T>` | CircuitBreaker.`rxExecuteCommand(Handler<Future<T>> command)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using the circuit breaker default fallback.
    `<T> rx.Single<T>` | CircuitBreaker.`rxExecuteCommandWithFallback(Handler<Future<T>> command, java.util.function.Function<Throwable,T> fallback)` Same as `CircuitBreaker.executeWithFallback(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, java.util.function.Function<java.lang.Throwable, T>)` but using a callback.

  - ### Uses of Handler in io.vertx.rxjava.config

    Methods in io.vertx.rxjava.config with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ConfigRetriever.`getConfig(Handler<AsyncResult<JsonObject>> completionHandler)` Reads the configuration from the different and computes the final configuration.
    `void` | ConfigRetriever.`listen(Handler<ConfigChange> listener)` Registers a listener receiving configuration changes.

  - ### Uses of Handler in io.vertx.rxjava.core

    Methods in io.vertx.rxjava.core that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<AsyncResult<CompositeFuture>>` | CompositeFuture.`completer()`
    `Handler<AsyncResult<T>>` | Future.`completer()`

    Methods in io.vertx.rxjava.core with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | Vertx.`close(Handler<AsyncResult<Void>> completionHandler)` Like `Vertx.close()` but the completionHandler will be called when the close is complete
    `static void` | Vertx.`clusteredVertx(VertxOptions options, Handler<AsyncResult<Vertx>> resultHandler)` Creates a clustered instance using the specified options.
    `<U> Future<U>` | CompositeFuture.`compose(Handler<CompositeFuture> handler, Future<U> next)` Compose this future with a provided `next` future.
    `<U> Future<U>` | Future.`compose(Handler<T> handler, Future<U> next)` Compose this future with a provided `next` future.
    `void` | Vertx.`deployVerticle(String name, DeploymentOptions options, Handler<AsyncResult<String>> completionHandler)` Like `Vertx.deployVerticle(java.lang.String)` but `DeploymentOptions` are provided to configure the deployment.
    `void` | Vertx.`deployVerticle(String name, Handler<AsyncResult<String>> completionHandler)` Like `Vertx.deployVerticle(java.lang.String)` but the completionHandler will be notified when the deployment is complete.
    `TimeoutStream` | TimeoutStream.`endHandler(Handler<Void> endHandler)`
    `Context` | Context.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler called when the context runs an action throwing an uncaught throwable. When this handler is called, `Vertx.currentContext()` will return this context.
    `TimeoutStream` | TimeoutStream.`exceptionHandler(Handler<Throwable> handler)`
    `Vertx` | Vertx.`exceptionHandler(Handler<Throwable> handler)` Set a default exception handler for `Context`, set on at creation.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered, Handler<AsyncResult<T>> resultHandler)` Safely execute some blocking code.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Invoke `Context.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` with order = true.
    `<T> void` | Context.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Invoke `Context.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` with order = true.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `Vertx.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` called with ordered = true.
    `<T> void` | Vertx.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `Vertx.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` called with ordered = true.
    `<T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `WorkerExecutor.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` called with ordered = true.
    `<T> void` | WorkerExecutor.`executeBlocking(Handler<Future<T>> blockingCodeHandler, Handler<AsyncResult<T>> resultHandler)` Like `WorkerExecutor.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` called with ordered = true.
    `<T> rx.Observable<T>` | Context.`executeBlockingObservable(Handler<Future<T>> blockingCodeHandler)` Deprecated. use `Context.rxExecuteBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean)` instead
    `<T> rx.Observable<T>` | Vertx.`executeBlockingObservable(Handler<Future<T>> blockingCodeHandler)` Deprecated. use `Vertx.rxExecuteBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean)` instead
    `<T> rx.Observable<T>` | WorkerExecutor.`executeBlockingObservable(Handler<Future<T>> blockingCodeHandler)` Deprecated. use `WorkerExecutor.rxExecuteBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean)` instead
    `<T> rx.Observable<T>` | Context.`executeBlockingObservable(Handler<Future<T>> blockingCodeHandler, boolean ordered)` Deprecated. use `Context.rxExecuteBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean)` instead
    `<T> rx.Observable<T>` | Vertx.`executeBlockingObservable(Handler<Future<T>> blockingCodeHandler, boolean ordered)` Deprecated. use `Vertx.rxExecuteBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean)` instead
    `<T> rx.Observable<T>` | WorkerExecutor.`executeBlockingObservable(Handler<Future<T>> blockingCodeHandler, boolean ordered)` Deprecated. use `WorkerExecutor.rxExecuteBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean)` instead
    `static <T> Future<T>` | Future.`future(Handler<Future<T>> handler)` Create a future that hasn't completed yet and that is passed to the `handler` before it is returned.
    `TimeoutStream` | TimeoutStream.`handler(Handler<Long> handler)`
    `void` | Context.`runOnContext(Handler<Void> action)` Run the specified action asynchronously on the same context, some time after the current execution has completed.
    `void` | Vertx.`runOnContext(Handler<Void> action)` Puts the handler on the event queue for the current context so it will be run asynchronously ASAP after all preceeding events have been handled.
    `<T> rx.Single<T>` | Context.`rxExecuteBlocking(Handler<Future<T>> blockingCodeHandler)` Invoke `Context.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` with order = true.
    `<T> rx.Single<T>` | Vertx.`rxExecuteBlocking(Handler<Future<T>> blockingCodeHandler)` Like `Vertx.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` called with ordered = true.
    `<T> rx.Single<T>` | WorkerExecutor.`rxExecuteBlocking(Handler<Future<T>> blockingCodeHandler)` Like `WorkerExecutor.executeBlocking(io.vertx.core.Handler<io.vertx.rxjava.core.Future<T>>, boolean, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>)` called with ordered = true.
    `<T> rx.Single<T>` | Context.`rxExecuteBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered)` Safely execute some blocking code.
    `<T> rx.Single<T>` | Vertx.`rxExecuteBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered)` Safely execute some blocking code.
    `<T> rx.Single<T>` | WorkerExecutor.`rxExecuteBlocking(Handler<Future<T>> blockingCodeHandler, boolean ordered)` Safely execute some blocking code.
    `CompositeFuture` | CompositeFuture.`setHandler(Handler<AsyncResult<CompositeFuture>> handler)`
    `Future<T>` | Future.`setHandler(Handler<AsyncResult<T>> handler)` Set a handler for the result.
    `long` | Vertx.`setPeriodic(long delay, Handler<Long> handler)` Set a periodic timer to fire every `delay` milliseconds, at which point `handler` will be called with the id of the timer.
    `long` | Vertx.`setTimer(long delay, Handler<Long> handler)` Set a one-shot timer to fire after `delay` milliseconds, at which point `handler` will be called with the id of the timer.
    `void` | Vertx.`undeploy(String deploymentID, Handler<AsyncResult<Void>> completionHandler)` Like `#undeploy(String)` but the completionHandler will be notified when the undeployment is complete.

  - ### Uses of Handler in io.vertx.rxjava.core.datagram

    Methods in io.vertx.rxjava.core.datagram with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `DatagramSocket` | DatagramSocket.`blockMulticastGroup(String multicastAddress, String sourceToBlock, Handler<AsyncResult<DatagramSocket>> handler)` Block the given address for the given multicast address and notifies the once the operation completes.
    `DatagramSocket` | DatagramSocket.`blockMulticastGroup(String multicastAddress, String networkInterface, String sourceToBlock, Handler<AsyncResult<DatagramSocket>> handler)` Block the given address for the given multicast address on the given network interface and notifies the once the operation completes.
    `void` | DatagramSocket.`close(Handler<AsyncResult<Void>> handler)` Closes the `DatagramSocket` implementation asynchronous and notifies the handler once done.
    `DatagramSocket` | DatagramSocket.`endHandler(Handler<Void> endHandler)`
    `DatagramSocket` | DatagramSocket.`exceptionHandler(Handler<Throwable> handler)`
    `DatagramSocket` | DatagramSocket.`handler(Handler<DatagramPacket> handler)`
    `DatagramSocket` | DatagramSocket.`listen(int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Start listening on the given port and host.
    `DatagramSocket` | DatagramSocket.`listenMulticastGroup(String multicastAddress, Handler<AsyncResult<DatagramSocket>> handler)` Joins a multicast group and listens for packets send to it.
    `DatagramSocket` | DatagramSocket.`listenMulticastGroup(String multicastAddress, String networkInterface, String source, Handler<AsyncResult<DatagramSocket>> handler)` Joins a multicast group and listens for packets send to it on the given network interface.
    `DatagramSocket` | DatagramSocket.`send(Buffer packet, int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Write the given `Buffer` to the `SocketAddress`.
    `DatagramSocket` | DatagramSocket.`send(String str, int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Write the given `String` to the `SocketAddress` using UTF8 encoding.
    `DatagramSocket` | DatagramSocket.`send(String str, String enc, int port, String host, Handler<AsyncResult<DatagramSocket>> handler)` Write the given `String` to the `SocketAddress` using the given encoding.
    `DatagramSocket` | DatagramSocket.`unlistenMulticastGroup(String multicastAddress, Handler<AsyncResult<DatagramSocket>> handler)` Leaves a multicast group and stops listening for packets send to it.
    `DatagramSocket` | DatagramSocket.`unlistenMulticastGroup(String multicastAddress, String networkInterface, String source, Handler<AsyncResult<DatagramSocket>> handler)` Leaves a multicast group and stops listening for packets send to it on the given network interface.

  - ### Uses of Handler in io.vertx.rxjava.core.dns

    Methods in io.vertx.rxjava.core.dns with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `DnsClient` | DnsClient.`lookup(String name, Handler<AsyncResult<String>> handler)` Try to lookup the A (ipv4) or AAAA (ipv6) record for the given name.
    `DnsClient` | DnsClient.`lookup4(String name, Handler<AsyncResult<String>> handler)` Try to lookup the A (ipv4) record for the given name.
    `DnsClient` | DnsClient.`lookup6(String name, Handler<AsyncResult<String>> handler)` Try to lookup the AAAA (ipv6) record for the given name.
    `DnsClient` | DnsClient.`resolveA(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve all A (ipv4) records for the given name.
    `DnsClient` | DnsClient.`resolveAAAA(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve all AAAA (ipv6) records for the given name.
    `DnsClient` | DnsClient.`resolveCNAME(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve the CNAME record for the given name.
    `DnsClient` | DnsClient.`resolveMX(String name, Handler<AsyncResult<List<MxRecord>>> handler)` Try to resolve the MX records for the given name.
    `DnsClient` | DnsClient.`resolveNS(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve the NS records for the given name.
    `DnsClient` | DnsClient.`resolvePTR(String name, Handler<AsyncResult<String>> handler)` Try to resolve the PTR record for the given name.
    `DnsClient` | DnsClient.`resolveSRV(String name, Handler<AsyncResult<List<SrvRecord>>> handler)` Try to resolve the SRV records for the given name.
    `DnsClient` | DnsClient.`resolveTXT(String name, Handler<AsyncResult<List<String>>> handler)` Try to resolve the TXT records for the given name.
    `DnsClient` | DnsClient.`reverseLookup(String ipaddress, Handler<AsyncResult<String>> handler)` Try to do a reverse lookup of an IP address.

  - ### Uses of Handler in io.vertx.rxjava.core.eventbus

    Methods in io.vertx.rxjava.core.eventbus with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `EventBus` | EventBus.`addInterceptor(Handler<SendContext> interceptor)` Add an interceptor that will be called whenever a message is sent from Vert.x
    `void` | MessageConsumer.`completionHandler(Handler<AsyncResult<Void>> completionHandler)` Optional method which can be called to indicate when the registration has been propagated across the cluster.
    `<T> MessageConsumer<T>` | EventBus.`consumer(String address, Handler<Message<T>> handler)` Create a consumer and register it against the specified address.
    `MessageProducer<T>` | MessageProducer.`drainHandler(Handler<Void> handler)`
    `MessageConsumer<T>` | MessageConsumer.`endHandler(Handler<Void> endHandler)`
    `MessageConsumer<T>` | MessageConsumer.`exceptionHandler(Handler<Throwable> handler)`
    `MessageProducer<T>` | MessageProducer.`exceptionHandler(Handler<Throwable> handler)`
    `MessageConsumer<T>` | MessageConsumer.`handler(Handler<Message<T>> handler)`
    `<T> MessageConsumer<T>` | EventBus.`localConsumer(String address, Handler<Message<T>> handler)` Like `EventBus.consumer(java.lang.String)` but the address won't be propagated across the cluster.
    `EventBus` | EventBus.`removeInterceptor(Handler<SendContext> interceptor)` Remove an interceptor
    `<R> void` | Message.`reply(Object message, DeliveryOptions options, Handler<AsyncResult<Message<R>>> replyHandler)` The same as `reply(R message, DeliveryOptions)` but you can specify handler for the reply - i.e.
    `<R> void` | Message.`reply(Object message, Handler<AsyncResult<Message<R>>> replyHandler)` The same as `reply(R message)` but you can specify handler for the reply - i.e.
    `<T> EventBus` | EventBus.`send(String address, Object message, DeliveryOptions options, Handler<AsyncResult<Message<T>>> replyHandler)` Like `EventBus.send(java.lang.String, java.lang.Object)` but specifying a `replyHandler` that will be called if the recipient subsequently replies to the message.
    `<T> EventBus` | EventBus.`send(String address, Object message, Handler<AsyncResult<Message<T>>> replyHandler)` Like `EventBus.send(java.lang.String, java.lang.Object)` but specifying a `replyHandler` that will be called if the recipient subsequently replies to the message.
    `<R> MessageProducer<T>` | MessageProducer.`send(T message, Handler<AsyncResult<Message<R>>> replyHandler)`
    `void` | MessageConsumer.`unregister(Handler<AsyncResult<Void>> completionHandler)` Unregisters the handler which created this registration

  - ### Uses of Handler in io.vertx.rxjava.core.file

    Methods in io.vertx.rxjava.core.file with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `FileSystem` | FileSystem.`chmod(String path, String perms, Handler<AsyncResult<Void>> handler)` Change the permissions on the file represented by `path` to `perms`, asynchronously.
    `FileSystem` | FileSystem.`chmodRecursive(String path, String perms, String dirPerms, Handler<AsyncResult<Void>> handler)` Change the permissions on the file represented by `path` to `perms`, asynchronously.
    `FileSystem` | FileSystem.`chown(String path, String user, String group, Handler<AsyncResult<Void>> handler)` Change the ownership on the file represented by `path` to `user` and {code group}, asynchronously.
    `void` | AsyncFile.`close(Handler<AsyncResult<Void>> handler)` Close the file.
    `FileSystem` | FileSystem.`copy(String from, String to, Handler<AsyncResult<Void>> handler)` Copy a file from the path `from` to path `to`, asynchronously.
    `FileSystem` | FileSystem.`copyRecursive(String from, String to, boolean recursive, Handler<AsyncResult<Void>> handler)` Copy a file from the path `from` to path `to`, asynchronously.
    `FileSystem` | FileSystem.`createFile(String path, Handler<AsyncResult<Void>> handler)` Creates an empty file with the specified `path`, asynchronously.
    `FileSystem` | FileSystem.`createFile(String path, String perms, Handler<AsyncResult<Void>> handler)` Creates an empty file with the specified `path` and permissions `perms`, asynchronously.
    `FileSystem` | FileSystem.`delete(String path, Handler<AsyncResult<Void>> handler)` Deletes the file represented by the specified `path`, asynchronously.
    `FileSystem` | FileSystem.`deleteRecursive(String path, boolean recursive, Handler<AsyncResult<Void>> handler)` Deletes the file represented by the specified `path`, asynchronously.
    `AsyncFile` | AsyncFile.`drainHandler(Handler<Void> handler)`
    `AsyncFile` | AsyncFile.`endHandler(Handler<Void> endHandler)`
    `AsyncFile` | AsyncFile.`exceptionHandler(Handler<Throwable> handler)`
    `FileSystem` | FileSystem.`exists(String path, Handler<AsyncResult<Boolean>> handler)` Determines whether the file as specified by the path `path` exists, asynchronously.
    `AsyncFile` | AsyncFile.`flush(Handler<AsyncResult<Void>> handler)` Same as `AsyncFile.flush()` but the handler will be called when the flush is complete or if an error occurs
    `FileSystem` | FileSystem.`fsProps(String path, Handler<AsyncResult<FileSystemProps>> handler)` Returns properties of the file-system being used by the specified `path`, asynchronously.
    `AsyncFile` | AsyncFile.`handler(Handler<Buffer> handler)`
    `FileSystem` | FileSystem.`link(String link, String existing, Handler<AsyncResult<Void>> handler)` Create a hard link on the file system from `link` to `existing`, asynchronously.
    `FileSystem` | FileSystem.`lprops(String path, Handler<AsyncResult<FileProps>> handler)` Obtain properties for the link represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`mkdir(String path, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`mkdir(String path, String perms, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`mkdirs(String path, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path` and any non existent parents, asynchronously.
    `FileSystem` | FileSystem.`mkdirs(String path, String perms, Handler<AsyncResult<Void>> handler)` Create the directory represented by `path` and any non existent parents, asynchronously.
    `FileSystem` | FileSystem.`move(String from, String to, Handler<AsyncResult<Void>> handler)` Move a file from the path `from` to path `to`, asynchronously.
    `FileSystem` | FileSystem.`open(String path, OpenOptions options, Handler<AsyncResult<AsyncFile>> handler)` Open the file represented by `path`, asynchronously.
    `FileSystem` | FileSystem.`props(String path, Handler<AsyncResult<FileProps>> handler)` Obtain properties for the file represented by `path`, asynchronously.
    `AsyncFile` | AsyncFile.`read(Buffer buffer, int offset, long position, int length, Handler<AsyncResult<Buffer>> handler)` Reads `length` bytes of data from the file at position `position` in the file, asynchronously.
    `FileSystem` | FileSystem.`readDir(String path, Handler<AsyncResult<List<String>>> handler)` Read the contents of the directory specified by `path`, asynchronously.
    `FileSystem` | FileSystem.`readDir(String path, String filter, Handler<AsyncResult<List<String>>> handler)` Read the contents of the directory specified by `path`, asynchronously.
    `FileSystem` | FileSystem.`readFile(String path, Handler<AsyncResult<Buffer>> handler)` Reads the entire file as represented by the path `path` as a , asynchronously.
    `FileSystem` | FileSystem.`readSymlink(String link, Handler<AsyncResult<String>> handler)` Returns the path representing the file that the symbolic link specified by `link` points to, asynchronously.
    `FileSystem` | FileSystem.`symlink(String link, String existing, Handler<AsyncResult<Void>> handler)` Create a symbolic link on the file system from `link` to `existing`, asynchronously.
    `FileSystem` | FileSystem.`truncate(String path, long len, Handler<AsyncResult<Void>> handler)` Truncate the file represented by `path` to length `len` in bytes, asynchronously.
    `FileSystem` | FileSystem.`unlink(String link, Handler<AsyncResult<Void>> handler)` Unlinks the link on the file system represented by the path `link`, asynchronously.
    `AsyncFile` | AsyncFile.`write(Buffer buffer, long position, Handler<AsyncResult<Void>> handler)` Write a `Buffer` to the file at position `position` in the file, asynchronously.
    `FileSystem` | FileSystem.`writeFile(String path, Buffer data, Handler<AsyncResult<Void>> handler)` Creates the file, and writes the specified `Buffer data` to the file represented by the path `path`, asynchronously.

  - ### Uses of Handler in io.vertx.rxjava.core.http

    Methods in io.vertx.rxjava.core.http with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `WebSocketBase` | ServerWebSocket.`binaryMessageHandler(Handler<Buffer> handler)` Set a binary message handler on the connection.
    `WebSocketBase` | WebSocket.`binaryMessageHandler(Handler<Buffer> handler)` Set a binary message handler on the connection.
    `WebSocketBase` | WebSocketBase.`binaryMessageHandler(Handler<Buffer> handler)` Set a binary message handler on the connection.
    `HttpServerResponse` | HttpServerResponse.`bodyEndHandler(Handler<Void> handler)` Provides a handler that will be called after the last part of the body is written to the wire.
    `HttpClientResponse` | HttpClientResponse.`bodyHandler(Handler<Buffer> bodyHandler)` Convenience method for receiving the entire request body in one piece.
    `HttpServerRequest` | HttpServerRequest.`bodyHandler(Handler<Buffer> bodyHandler)` Convenience method for receiving the entire request body in one piece.
    `void` | HttpServer.`close(Handler<AsyncResult<Void>> completionHandler)` Like `HttpServer.close()` but supplying a handler that will be called when the server is actually closed (or has failed).
    `HttpConnection` | HttpConnection.`closeHandler(Handler<Void> handler)` Set a close handler.
    `HttpServerResponse` | HttpServerResponse.`closeHandler(Handler<Void> handler)` Set a close handler for the response, this is called when the underlying connection is closed and the response was still using the connection.
    `ServerWebSocket` | ServerWebSocket.`closeHandler(Handler<Void> handler)`
    `WebSocket` | WebSocket.`closeHandler(Handler<Void> handler)`
    `WebSocketBase` | WebSocketBase.`closeHandler(Handler<Void> handler)` Set a close handler.
    `HttpClientRequest` | HttpClientRequest.`connectionHandler(Handler<HttpConnection> handler)` Set a connection handler called when an HTTP connection has been established.
    `HttpServer` | HttpServer.`connectionHandler(Handler<HttpConnection> handler)` Set a connection handler for the server.
    `HttpClientRequest` | HttpClientRequest.`continueHandler(Handler<Void> handler)` If you send an HTTP request with the header `Expect` set to the value `100-continue` and the server responds with an interim HTTP response with a status code of `100` and a continue handler has been set using this method, then the `handler` will be called.
    `HttpClientResponse` | HttpClientResponse.`customFrameHandler(Handler<HttpFrame> handler)` Set an custom frame handler.
    `HttpServerRequest` | HttpServerRequest.`customFrameHandler(Handler<HttpFrame> handler)` Set a custom frame handler.
    `HttpClientRequest` | HttpClient.`delete(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`delete(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`delete(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`delete(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`deleteAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP DELETE request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClientRequest.`drainHandler(Handler<Void> handler)`
    `HttpServerResponse` | HttpServerResponse.`drainHandler(Handler<Void> handler)`
    `ServerWebSocket` | ServerWebSocket.`drainHandler(Handler<Void> handler)`
    `WebSocket` | WebSocket.`drainHandler(Handler<Void> handler)`
    `WebSocketBase` | WebSocketBase.`drainHandler(Handler<Void> handler)`
    `HttpClientRequest` | HttpClientRequest.`endHandler(Handler<Void> endHandler)`
    `HttpClientResponse` | HttpClientResponse.`endHandler(Handler<Void> endHandler)`
    `HttpServerFileUpload` | HttpServerFileUpload.`endHandler(Handler<Void> endHandler)`
    `HttpServerRequest` | HttpServerRequest.`endHandler(Handler<Void> endHandler)`
    `HttpServerResponse` | HttpServerResponse.`endHandler(Handler<Void> handler)` Set an end handler for the response.
    `ServerWebSocket` | ServerWebSocket.`endHandler(Handler<Void> endHandler)`
    `WebSocket` | WebSocket.`endHandler(Handler<Void> endHandler)`
    `WebSocketBase` | WebSocketBase.`endHandler(Handler<Void> endHandler)`
    `HttpClientRequest` | HttpClientRequest.`exceptionHandler(Handler<Throwable> handler)`
    `HttpClientResponse` | HttpClientResponse.`exceptionHandler(Handler<Throwable> handler)`
    `HttpConnection` | HttpConnection.`exceptionHandler(Handler<Throwable> handler)` Set an handler called when a connection error happens
    `HttpServerFileUpload` | HttpServerFileUpload.`exceptionHandler(Handler<Throwable> handler)`
    `HttpServerRequest` | HttpServerRequest.`exceptionHandler(Handler<Throwable> handler)`
    `HttpServerResponse` | HttpServerResponse.`exceptionHandler(Handler<Throwable> handler)`
    `ServerWebSocket` | ServerWebSocket.`exceptionHandler(Handler<Throwable> handler)`
    `WebSocket` | WebSocket.`exceptionHandler(Handler<Throwable> handler)`
    `WebSocketBase` | WebSocketBase.`exceptionHandler(Handler<Throwable> handler)`
    `ServerWebSocket` | ServerWebSocket.`frameHandler(Handler<WebSocketFrame> handler)`
    `WebSocket` | WebSocket.`frameHandler(Handler<WebSocketFrame> handler)`
    `WebSocketBase` | WebSocketBase.`frameHandler(Handler<WebSocketFrame> handler)` Set a frame handler on the connection.
    `HttpClientRequest` | HttpClient.`get(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`get(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`get(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`get(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`getAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP GET request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server with the specified options, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server at the default host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`getNow(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP GET request to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpConnection` | HttpConnection.`goAwayHandler(Handler<GoAway> handler)` Set an handler called when a frame is received.
    `HttpClientResponse` | HttpClientResponse.`handler(Handler<Buffer> handler)`
    `HttpServerFileUpload` | HttpServerFileUpload.`handler(Handler<Buffer> handler)`
    `HttpServerRequest` | HttpServerRequest.`handler(Handler<Buffer> handler)`
    `ServerWebSocket` | ServerWebSocket.`handler(Handler<Buffer> handler)`
    `WebSocket` | WebSocket.`handler(Handler<Buffer> handler)`
    `WebSocketBase` | WebSocketBase.`handler(Handler<Buffer> handler)`
    `HttpClientRequest` | HttpClientRequest.`handler(Handler<HttpClientResponse> handler)`
    `HttpClientRequest` | HttpClient.`head(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`head(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`head(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`head(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`headAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP HEAD request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpServerResponse` | HttpServerResponse.`headersEndHandler(Handler<Void> handler)` Provide a handler that will be called just before the headers are written to the wire.
    `HttpClient` | HttpClient.`headNow(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`headNow(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server with the specified options, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`headNow(String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server at the default host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`headNow(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP HEAD request to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpServer` | HttpServer.`listen(Handler<AsyncResult<HttpServer>> listenHandler)` Like `HttpServer.listen()` but supplying a handler that will be called when the server is actually listening (or has failed).
    `HttpServer` | HttpServer.`listen(int port, Handler<AsyncResult<HttpServer>> listenHandler)` Like `HttpServer.listen()` but supplying a handler that will be called when the server is actually listening (or has failed).
    `HttpServer` | HttpServer.`listen(int port, String host, Handler<AsyncResult<HttpServer>> listenHandler)` Like `HttpServer.listen()` but supplying a handler that will be called when the server is actually listening (or has failed).
    `HttpClientRequest` | HttpClient.`options(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`options(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`options(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`options(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`optionsAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP OPTIONS request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server with the specified options, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server at the default host and port, specifying a response handler to receive the response
    `HttpClient` | HttpClient.`optionsNow(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Sends an HTTP OPTIONS request to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpConnection` | HttpConnection.`ping(Buffer data, Handler<AsyncResult<Buffer>> pongHandler)` Send a frame to the remote endpoint.
    `HttpConnection` | HttpConnection.`pingHandler(Handler<Buffer> handler)` Set an handler notified when a frame is received from the remote endpoint.
    `HttpClientRequest` | HttpClient.`post(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`post(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`post(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`post(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`postAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP POST request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String path, Handler<AsyncResult<HttpServerResponse>> handler)` Like `HttpServerResponse.push(io.vertx.core.http.HttpMethod, java.lang.String, java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.core.http.HttpServerResponse>>)` with the host copied from the current request.
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String path, MultiMap headers, Handler<AsyncResult<HttpServerResponse>> handler)` Like `HttpServerResponse.push(io.vertx.core.http.HttpMethod, java.lang.String, java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.core.http.HttpServerResponse>>)` with the host copied from the current request.
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String host, String path, Handler<AsyncResult<HttpServerResponse>> handler)` Like `HttpServerResponse.push(io.vertx.core.http.HttpMethod, java.lang.String, java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.core.http.HttpServerResponse>>)` with no headers.
    `HttpServerResponse` | HttpServerResponse.`push(HttpMethod method, String host, String path, MultiMap headers, Handler<AsyncResult<HttpServerResponse>> handler)` Push a response to the client. The `handler` will be notified with a success when the push can be sent and with a failure when the client has disabled push or reset the push before it has been sent. The `handler` may be queued if the client has reduced the maximum number of streams the server can push concurrently. Push can be sent only for peer initiated streams and if the response is not ended.
    `HttpClientRequest` | HttpClientRequest.`pushHandler(Handler<HttpClientRequest> handler)` Set a push handler for this request. The handler is called when the client receives a push promise from the server.
    `HttpClientRequest` | HttpClient.`put(int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`put(RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server with the specified options, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`put(String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`put(String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`putAbs(String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP PUT request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpConnection` | HttpConnection.`remoteSettingsHandler(Handler<Http2Settings> handler)` Set an handler that is called when remote endpoint `Http2Settings` are updated.
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, int port, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server at the specified host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, RequestOptions options, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server with the specified options, specifying a response handler to receive
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server at the default host and port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`request(HttpMethod method, String host, String requestURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server at the specified host and default port, specifying a response handler to receive the response
    `HttpClientRequest` | HttpClient.`requestAbs(HttpMethod method, String absoluteURI, Handler<HttpClientResponse> responseHandler)` Create an HTTP request to send to the server using an absolute URI, specifying a response handler to receive the response
    `HttpServer` | HttpServer.`requestHandler(Handler<HttpServerRequest> handler)` Set the request handler for the server to `requestHandler`.
    `HttpServerResponse` | HttpServerResponse.`sendFile(String filename, Handler<AsyncResult<Void>> resultHandler)` Like `HttpServerResponse.sendFile(java.lang.String)` but providing a handler which will be notified once the file has been completely written to the wire.
    `HttpServerResponse` | HttpServerResponse.`sendFile(String filename, long offset, Handler<AsyncResult<Void>> resultHandler)` Like `HttpServerResponse.sendFile(java.lang.String)` but providing a handler which will be notified once the file has been completely written to the wire.
    `HttpServerResponse` | HttpServerResponse.`sendFile(String filename, long offset, long length, Handler<AsyncResult<Void>> resultHandler)` Like `HttpServerResponse.sendFile(java.lang.String)` but providing a handler which will be notified once the file has been completely written to the wire.
    `HttpClientRequest` | HttpClientRequest.`sendHead(Handler<HttpVersion> completionHandler)` Like `HttpClientRequest.sendHead()` but with an handler after headers have been sent.
    `HttpConnection` | HttpConnection.`shutdownHandler(Handler<Void> handler)` Set an handler called when a frame has been sent or received and all connections are closed.
    `WebSocketBase` | ServerWebSocket.`textMessageHandler(Handler<String> handler)` Set a text message handler on the connection.
    `WebSocketBase` | WebSocket.`textMessageHandler(Handler<String> handler)` Set a text message handler on the connection.
    `WebSocketBase` | WebSocketBase.`textMessageHandler(Handler<String> handler)` Set a text message handler on the connection.
    `HttpConnection` | HttpConnection.`updateSettings(Http2Settings settings, Handler<AsyncResult<Void>> completionHandler)` Send to the remote endpoint an update of this endpoint settings The `completionHandler` will be notified when the remote endpoint has acknowledged the settings.
    `HttpServerRequest` | HttpServerRequest.`uploadHandler(Handler<HttpServerFileUpload> uploadHandler)` Set an upload handler.
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI, and with the specified headers
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, and with the specified headers
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, and with the specified headers
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(int port, String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified port, host and relative request URI, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(RequestOptions options, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified options
    `HttpClient` | HttpClient.`websocket(RequestOptions options, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options
    `HttpClient` | HttpClient.`websocket(RequestOptions options, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified options, and with the specified headers
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, and with the specified headers
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, and with the specified headers
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified optionsI, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket with the specified options, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(RequestOptions options, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket with the specified options, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(String requestURI, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port
    `HttpClient` | HttpClient.`websocket(String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port
    `HttpClient` | HttpClient.`websocket(String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port and the specified headers
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port and the specified headers
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port and the specified headers
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers and the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers and the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers and the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers, the specified version of WebSockets and the specified sub protocols
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers, the specified version of WebSockets and the specified sub protocols
    `HttpClient` | HttpClient.`websocket(String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket at the relative request URI using the default host and port, the specified headers, the specified version of WebSockets and the specified sub protocols
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, Handler<WebSocket> wsConnect)` Connect a WebSocket to the host and relative request URI and default port
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the host and relative request URI and default port
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the host and relative request URI and default port
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified host,relative request UR, and default port and with the specified headers
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host,relative request UR, and default port and with the specified headers
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host,relative request UR, and default port and with the specified headers
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified host, relative request URI and default port with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port with the specified headers and using the specified version of WebSockets
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect)` Connect a WebSocket to the specified host, relative request URI and default port, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpClient` | HttpClient.`websocket(String host, String requestURI, MultiMap headers, WebsocketVersion version, String subProtocols, Handler<WebSocket> wsConnect, Handler<Throwable> failureHandler)` Connect a WebSocket to the specified host, relative request URI and default port, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols
    `HttpServer` | HttpServer.`websocketHandler(Handler<ServerWebSocket> handler)` Set the websocket handler for the server to `wsHandler`.

  - ### Uses of Handler in io.vertx.rxjava.core.net

    Methods in io.vertx.rxjava.core.net with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | NetServer.`close(Handler<AsyncResult<Void>> completionHandler)` Like `NetServer.close()` but supplying a handler that will be notified when close is complete.
    `NetSocket` | NetSocket.`closeHandler(Handler<Void> handler)` Set a handler that will be called when the NetSocket is closed
    `NetClient` | NetClient.`connect(int port, String host, Handler<AsyncResult<NetSocket>> connectHandler)` Open a connection to a server at the specific `port` and `host`.
    `NetClient` | NetClient.`connect(int port, String host, String serverName, Handler<AsyncResult<NetSocket>> connectHandler)` Open a connection to a server at the specific `port` and `host`.
    `NetServer` | NetServer.`connectHandler(Handler<NetSocket> handler)` Supply a connect handler for this server.
    `NetSocket` | NetSocket.`drainHandler(Handler<Void> handler)`
    `NetSocket` | NetSocket.`endHandler(Handler<Void> endHandler)`
    `NetSocket` | NetSocket.`exceptionHandler(Handler<Throwable> handler)`
    `NetSocket` | NetSocket.`handler(Handler<Buffer> handler)`
    `NetServer` | NetServer.`listen(Handler<AsyncResult<NetServer>> listenHandler)` Like `NetServer.listen()` but providing a handler that will be notified when the server is listening, or fails.
    `NetServer` | NetServer.`listen(int port, Handler<AsyncResult<NetServer>> listenHandler)` Like `NetServer.listen()` but providing a handler that will be notified when the server is listening, or fails.
    `NetServer` | NetServer.`listen(int port, String host, Handler<AsyncResult<NetServer>> listenHandler)` Like `NetServer.listen()` but providing a handler that will be notified when the server is listening, or fails.
    `NetSocket` | NetSocket.`sendFile(String filename, Handler<AsyncResult<Void>> resultHandler)` Same as `NetSocket.sendFile(java.lang.String)` but also takes a handler that will be called when the send has completed or a failure has occurred
    `NetSocket` | NetSocket.`sendFile(String filename, long offset, Handler<AsyncResult<Void>> resultHandler)` Same as `NetSocket.sendFile(java.lang.String)` but also takes a handler that will be called when the send has completed or a failure has occurred
    `NetSocket` | NetSocket.`sendFile(String filename, long offset, long length, Handler<AsyncResult<Void>> resultHandler)` Same as `NetSocket.sendFile(java.lang.String)` but also takes a handler that will be called when the send has completed or a failure has occurred
    `NetSocket` | NetSocket.`upgradeToSsl(Handler<Void> handler)` Upgrade channel to use SSL/TLS.
    `NetSocket` | NetSocket.`upgradeToSsl(String serverName, Handler<Void> handler)` Upgrade channel to use SSL/TLS.

  - ### Uses of Handler in io.vertx.rxjava.core.parsetools

    Classes in io.vertx.rxjava.core.parsetools that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `RecordParser` A helper class which allows you to easily parse protocols which are delimited by a sequence of bytes, or fixed size records.

    Methods in io.vertx.rxjava.core.parsetools with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static RecordParser` | RecordParser.`newDelimited(Buffer delim, Handler<Buffer> output)` Create a new `RecordParser` instance, initially in delimited mode, and where the delimiter can be represented by the `Buffer` delim.
    `static RecordParser` | RecordParser.`newDelimited(String delim, Handler<Buffer> output)` Create a new `RecordParser` instance, initially in delimited mode, and where the delimiter can be represented by the String `` delim endcoded in latin-1 .
    `static RecordParser` | RecordParser.`newFixed(int size, Handler<Buffer> output)` Create a new `RecordParser` instance, initially in fixed size mode, and where the record size is specified by the `size` parameter.
    `void` | RecordParser.`setOutput(Handler<Buffer> output)`

  - ### Uses of Handler in io.vertx.rxjava.core.shareddata

    Methods in io.vertx.rxjava.core.shareddata with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | Counter.`addAndGet(long value, Handler<AsyncResult<Long>> resultHandler)` Add the value to the counter atomically and return the new count
    `void` | AsyncMap.`clear(Handler<AsyncResult<Void>> resultHandler)` Clear all entries in the map
    `void` | Counter.`compareAndSet(long expected, long value, Handler<AsyncResult<Boolean>> resultHandler)` Set the counter to the specified value only if the current value is the expectec value.
    `void` | Counter.`decrementAndGet(Handler<AsyncResult<Long>> resultHandler)` Decrement the counter atomically and return the new count
    `void` | Counter.`get(Handler<AsyncResult<Long>> resultHandler)` Get the current value of the counter
    `void` | AsyncMap.`get(K k, Handler<AsyncResult<V>> resultHandler)` Get a value from the map, asynchronously.
    `void` | Counter.`getAndAdd(long value, Handler<AsyncResult<Long>> resultHandler)` Add the value to the counter atomically and return the value before the add
    `void` | Counter.`getAndIncrement(Handler<AsyncResult<Long>> resultHandler)` Increment the counter atomically and return the value before the increment.
    `<K,V> void` | SharedData.`getClusterWideMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> resultHandler)` Get the cluster wide map with the specified name.
    `void` | SharedData.`getCounter(String name, Handler<AsyncResult<Counter>> resultHandler)` Get a cluster wide counter.
    `void` | SharedData.`getLock(String name, Handler<AsyncResult<Lock>> resultHandler)` Get a cluster wide lock with the specified name.
    `void` | SharedData.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> resultHandler)` Like `SharedData.getLock(java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.core.shareddata.Lock>>)` but specifying a timeout.
    `void` | Counter.`incrementAndGet(Handler<AsyncResult<Long>> resultHandler)` Increment the counter atomically and return the new count
    `void` | AsyncMap.`put(K k, V v, Handler<AsyncResult<Void>> completionHandler)` Put a value in the map, asynchronously.
    `void` | AsyncMap.`put(K k, V v, long ttl, Handler<AsyncResult<Void>> completionHandler)` Like `AsyncMap.put(K, V, io.vertx.core.Handler<io.vertx.core.AsyncResult<java.lang.Void>>)` but specifying a time to live for the entry.
    `void` | AsyncMap.`putIfAbsent(K k, V v, Handler<AsyncResult<V>> completionHandler)` Put the entry only if there is no entry with the key already present.
    `void` | AsyncMap.`putIfAbsent(K k, V v, long ttl, Handler<AsyncResult<V>> completionHandler)` Link `AsyncMap.putIfAbsent(K, V, io.vertx.core.Handler<io.vertx.core.AsyncResult<V>>)` but specifying a time to live for the entry.
    `void` | AsyncMap.`remove(K k, Handler<AsyncResult<V>> resultHandler)` Remove a value from the map, asynchronously.
    `void` | AsyncMap.`removeIfPresent(K k, V v, Handler<AsyncResult<Boolean>> resultHandler)` Remove a value from the map, only if entry already exists with same value.
    `void` | AsyncMap.`replace(K k, V v, Handler<AsyncResult<V>> resultHandler)` Replace the entry only if it is currently mapped to some value
    `void` | AsyncMap.`replaceIfPresent(K k, V oldValue, V newValue, Handler<AsyncResult<Boolean>> resultHandler)` Replace the entry only if it is currently mapped to a specific value
    `void` | AsyncMap.`size(Handler<AsyncResult<Integer>> resultHandler)` Provide the number of entries in the map

  - ### Uses of Handler in io.vertx.rxjava.core.streams

    Methods in io.vertx.rxjava.core.streams with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `WriteStream<T>` | WriteStream.`drainHandler(Handler<Void> handler)` Set a drain handler on the stream.
    `ReadStream<T>` | ReadStream.`endHandler(Handler<Void> endHandler)` Set an end handler.
    `ReadStream<T>` | ReadStream.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the read stream.
    `StreamBase` | StreamBase.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler.
    `WriteStream<T>` | WriteStream.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the write stream.
    `ReadStream<T>` | ReadStream.`handler(Handler<T> handler)` Set a data handler.

  - ### Uses of Handler in io.vertx.rxjava.ext.auth

    Methods in io.vertx.rxjava.ext.auth with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AuthProvider.`authenticate(JsonObject authInfo, Handler<AsyncResult<User>> resultHandler)` Authenticate a user.
    `User` | User.`isAuthorised(String authority, Handler<AsyncResult<Boolean>> resultHandler)` Is the user authorised to

  - ### Uses of Handler in io.vertx.rxjava.ext.auth.mongo

    Methods in io.vertx.rxjava.ext.auth.mongo with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | MongoAuth.`insertUser(String username, String password, List<String> roles, List<String> permissions, Handler<AsyncResult<String>> resultHandler)` Insert a new user into mongo in the convenient way

  - ### Uses of Handler in io.vertx.rxjava.ext.auth.oauth2

    Methods in io.vertx.rxjava.ext.auth.oauth2 with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `OAuth2Auth` | OAuth2Auth.`api(HttpMethod method, String path, JsonObject params, Handler<AsyncResult<JsonObject>> handler)` Call OAuth2 APIs.
    `OAuth2Auth` | OAuth2Auth.`decodeToken(String token, Handler<AsyncResult<AccessToken>> handler)` Decode a token to a `AccessToken` object.
    `void` | OAuth2Auth.`getToken(JsonObject params, Handler<AsyncResult<AccessToken>> handler)` Returns the Access Token object.
    `AccessToken` | AccessToken.`introspect(Handler<AsyncResult<Void>> callback)` Introspect access token.
    `OAuth2Auth` | OAuth2Auth.`introspectToken(String token, Handler<AsyncResult<AccessToken>> handler)` Query an OAuth 2.0 authorization server to determine the active state of an OAuth 2.0 token and to determine meta-information about this token.
    `OAuth2Auth` | OAuth2Auth.`introspectToken(String token, String tokenType, Handler<AsyncResult<JsonObject>> handler)` Query an OAuth 2.0 authorization server to determine the active state of an OAuth 2.0 token and to determine meta-information about this token.
    `AccessToken` | AccessToken.`logout(Handler<AsyncResult<Void>> callback)` Revoke refresh token and calls the logout endpoint.
    `AccessToken` | AccessToken.`refresh(Handler<AsyncResult<Void>> callback)` Refresh the access token
    `AccessToken` | AccessToken.`revoke(String token_type, Handler<AsyncResult<Void>> callback)` Revoke access or refresh token

  - ### Uses of Handler in io.vertx.rxjava.ext.consul

    Methods in io.vertx.rxjava.ext.consul with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `ConsulClient` | ConsulClient.`agentInfo(Handler<AsyncResult<JsonObject>> resultHandler)` Returns the configuration and member information of the local agent
    `ConsulClient` | ConsulClient.`catalogDatacenters(Handler<AsyncResult<List<String>>> resultHandler)` Return all the datacenters that are known by the Consul server
    `ConsulClient` | ConsulClient.`catalogNodes(Handler<AsyncResult<NodeList>> resultHandler)` Returns the nodes registered in a datacenter
    `ConsulClient` | ConsulClient.`catalogNodeServices(String node, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the node's registered services
    `ConsulClient` | ConsulClient.`catalogNodeServicesWithOptions(String node, BlockingQueryOptions options, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the node's registered services This is blocking query unlike `ConsulClient.catalogNodeServices(java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.ext.consul.ServiceList>>)`
    `ConsulClient` | ConsulClient.`catalogNodesWithOptions(NodeQueryOptions options, Handler<AsyncResult<NodeList>> resultHandler)` Returns the nodes registered in a datacenter
    `ConsulClient` | ConsulClient.`catalogServiceNodes(String service, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the nodes providing a service
    `ConsulClient` | ConsulClient.`catalogServiceNodesWithOptions(String service, ServiceQueryOptions options, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the nodes providing a service
    `ConsulClient` | ConsulClient.`catalogServices(Handler<AsyncResult<ServiceList>> resultHandler)` Returns the services registered in a datacenter
    `ConsulClient` | ConsulClient.`catalogServicesWithOptions(BlockingQueryOptions options, Handler<AsyncResult<ServiceList>> resultHandler)` Returns the services registered in a datacenter This is blocking query unlike `ConsulClient.catalogServices(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.ext.consul.ServiceList>>)`
    `ConsulClient` | ConsulClient.`cloneAclToken(String id, Handler<AsyncResult<String>> idHandler)` Clone Acl token
    `ConsulClient` | ConsulClient.`coordinateDatacenters(Handler<AsyncResult<List<DcCoordinates>>> resultHandler)` Returns the WAN network coordinates for all Consul servers, organized by DCs
    `ConsulClient` | ConsulClient.`coordinateNodes(Handler<AsyncResult<CoordinateList>> resultHandler)` Returns the LAN network coordinates for all nodes in a given DC
    `ConsulClient` | ConsulClient.`coordinateNodesWithOptions(BlockingQueryOptions options, Handler<AsyncResult<CoordinateList>> resultHandler)` Returns the LAN network coordinates for all nodes in a given DC This is blocking query unlike `ConsulClient.coordinateNodes(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.ext.consul.CoordinateList>>)`
    `ConsulClient` | ConsulClient.`createAclToken(AclToken token, Handler<AsyncResult<String>> idHandler)` Create new Acl token
    `ConsulClient` | ConsulClient.`createSession(Handler<AsyncResult<String>> idHandler)` Initialize a new session
    `ConsulClient` | ConsulClient.`createSessionWithOptions(SessionOptions options, Handler<AsyncResult<String>> idHandler)` Initialize a new session
    `ConsulClient` | ConsulClient.`deleteValue(String key, Handler<AsyncResult<Void>> resultHandler)` Remove the key/value pair that corresponding to the specified key
    `ConsulClient` | ConsulClient.`deleteValues(String keyPrefix, Handler<AsyncResult<Void>> resultHandler)` Removes all the key/value pair that corresponding to the specified key prefix
    `ConsulClient` | ConsulClient.`deregisterCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Remove a check from the local agent.
    `ConsulClient` | ConsulClient.`deregisterService(String id, Handler<AsyncResult<Void>> resultHandler)` Remove a service from the local agent.
    `ConsulClient` | ConsulClient.`destroyAclToken(String id, Handler<AsyncResult<Void>> resultHandler)` Destroy Acl token
    `ConsulClient` | ConsulClient.`destroySession(String id, Handler<AsyncResult<Void>> resultHandler)` Destroys the given session
    `ConsulClient` | ConsulClient.`failCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "critical".
    `ConsulClient` | ConsulClient.`failCheckWithNote(String checkId, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "critical".
    `ConsulClient` | ConsulClient.`fireEvent(String name, Handler<AsyncResult<Event>> resultHandler)` Fires a new user event
    `ConsulClient` | ConsulClient.`fireEventWithOptions(String name, EventOptions options, Handler<AsyncResult<Event>> resultHandler)` Fires a new user event
    `ConsulClient` | ConsulClient.`getValue(String key, Handler<AsyncResult<KeyValue>> resultHandler)` Returns key/value pair that corresponding to the specified key
    `ConsulClient` | ConsulClient.`getValues(String keyPrefix, Handler<AsyncResult<KeyValueList>> resultHandler)` Returns the list of key/value pairs that corresponding to the specified key prefix.
    `ConsulClient` | ConsulClient.`getValuesWithOptions(String keyPrefix, BlockingQueryOptions options, Handler<AsyncResult<KeyValueList>> resultHandler)` Returns the list of key/value pairs that corresponding to the specified key prefix.
    `ConsulClient` | ConsulClient.`getValueWithOptions(String key, BlockingQueryOptions options, Handler<AsyncResult<KeyValue>> resultHandler)` Returns key/value pair that corresponding to the specified key.
    `ConsulClient` | ConsulClient.`healthChecks(String service, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks associated with the service
    `ConsulClient` | ConsulClient.`healthChecksWithOptions(String service, CheckQueryOptions options, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks associated with the service
    `ConsulClient` | ConsulClient.`healthServiceNodes(String service, boolean passing, Handler<AsyncResult<ServiceEntryList>> resultHandler)` Returns the nodes providing the service.
    `ConsulClient` | ConsulClient.`healthServiceNodesWithOptions(String service, boolean passing, ServiceQueryOptions options, Handler<AsyncResult<ServiceEntryList>> resultHandler)` Returns the nodes providing the service.
    `ConsulClient` | ConsulClient.`healthState(CheckStatus checkStatus, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks in the specified status
    `ConsulClient` | ConsulClient.`healthStateWithOptions(CheckStatus checkStatus, CheckQueryOptions options, Handler<AsyncResult<CheckList>> resultHandler)` Returns the checks in the specified status
    `ConsulClient` | ConsulClient.`infoAclToken(String id, Handler<AsyncResult<AclToken>> tokenHandler)` Get info of Acl token
    `ConsulClient` | ConsulClient.`infoSession(String id, Handler<AsyncResult<Session>> resultHandler)` Returns the requested session information
    `ConsulClient` | ConsulClient.`infoSessionWithOptions(String id, BlockingQueryOptions options, Handler<AsyncResult<Session>> resultHandler)` Returns the requested session information This is blocking query unlike `ConsulClient.infoSession(java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.ext.consul.Session>>)`
    `ConsulClient` | ConsulClient.`leaderStatus(Handler<AsyncResult<String>> resultHandler)` Get the Raft leader for the datacenter in which the agent is running.
    `ConsulClient` | ConsulClient.`listAclTokens(Handler<AsyncResult<List<AclToken>>> resultHandler)` Get list of Acl token
    `ConsulClient` | ConsulClient.`listEvents(Handler<AsyncResult<EventList>> resultHandler)` Returns the most recent events known by the agent
    `ConsulClient` | ConsulClient.`listEventsWithOptions(EventListOptions options, Handler<AsyncResult<EventList>> resultHandler)` Returns the most recent events known by the agent.
    `ConsulClient` | ConsulClient.`listNodeSessions(String nodeId, Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions for a given node
    `ConsulClient` | ConsulClient.`listNodeSessionsWithOptions(String nodeId, BlockingQueryOptions options, Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions for a given node This is blocking query unlike `ConsulClient.listNodeSessions(java.lang.String, io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.ext.consul.SessionList>>)`
    `ConsulClient` | ConsulClient.`listSessions(Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions
    `ConsulClient` | ConsulClient.`listSessionsWithOptions(BlockingQueryOptions options, Handler<AsyncResult<SessionList>> resultHandler)` Returns the active sessions This is blocking query unlike `ConsulClient.listSessions(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.ext.consul.SessionList>>)`
    `ConsulClient` | ConsulClient.`localChecks(Handler<AsyncResult<List<Check>>> resultHandler)` Return all the checks that are registered with the local agent.
    `ConsulClient` | ConsulClient.`localServices(Handler<AsyncResult<List<Service>>> resultHandler)` Returns list of services registered with the local agent.
    `ConsulClient` | ConsulClient.`maintenanceService(MaintenanceOptions maintenanceOptions, Handler<AsyncResult<Void>> resultHandler)` Places a given service into "maintenance mode"
    `ConsulClient` | ConsulClient.`passCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "passing".
    `ConsulClient` | ConsulClient.`passCheckWithNote(String checkId, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "passing".
    `ConsulClient` | ConsulClient.`peersStatus(Handler<AsyncResult<List<String>>> resultHandler)` Retrieves the Raft peers for the datacenter in which the the agent is running.
    `ConsulClient` | ConsulClient.`putValue(String key, String value, Handler<AsyncResult<Boolean>> resultHandler)` Adds specified key/value pair
    `ConsulClient` | ConsulClient.`putValueWithOptions(String key, String value, KeyValueOptions options, Handler<AsyncResult<Boolean>> resultHandler)`
    `ConsulClient` | ConsulClient.`registerCheck(CheckOptions checkOptions, Handler<AsyncResult<Void>> resultHandler)` Add a new check to the local agent.
    `ConsulClient` | ConsulClient.`registerService(ServiceOptions serviceOptions, Handler<AsyncResult<Void>> resultHandler)` Adds a new service, with an optional health check, to the local agent.
    `ConsulClient` | ConsulClient.`renewSession(String id, Handler<AsyncResult<Session>> resultHandler)` Renews the given session.
    `Watch<T>` | Watch.`setHandler(Handler<AsyncResult<T>> handler)` Set the result handler.
    `ConsulClient` | ConsulClient.`transaction(TxnRequest request, Handler<AsyncResult<TxnResponse>> resultHandler)` Manages multiple operations inside a single, atomic transaction.
    `ConsulClient` | ConsulClient.`updateAclToken(AclToken token, Handler<AsyncResult<String>> idHandler)` Update Acl token
    `ConsulClient` | ConsulClient.`updateCheck(String checkId, CheckStatus status, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to given status.
    `ConsulClient` | ConsulClient.`updateCheckWithNote(String checkId, CheckStatus status, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to given status.
    `ConsulClient` | ConsulClient.`warnCheck(String checkId, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "warning".
    `ConsulClient` | ConsulClient.`warnCheckWithNote(String checkId, String note, Handler<AsyncResult<Void>> resultHandler)` Set status of the check to "warning".

  - ### Uses of Handler in io.vertx.rxjava.ext.healthchecks

    Classes in io.vertx.rxjava.ext.healthchecks that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `HealthCheckHandler` A Vert.x Web handler on which you register health check procedure.

    Methods in io.vertx.rxjava.ext.healthchecks with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `HealthChecks` | HealthChecks.`invoke(Handler<JsonObject> resultHandler)` Invokes the registered procedures and computes the outcome.
    `HealthChecks` | HealthChecks.`invoke(String name, Handler<AsyncResult<JsonObject>> resultHandler)` Invokes the registered procedure with the given name and sub-procedures.
    `HealthCheckHandler` | HealthCheckHandler.`register(String name, Handler<Future<Status>> procedure)` Registers a health check procedure.
    `HealthChecks` | HealthChecks.`register(String name, Handler<Future<Status>> procedure)` Registers a health check procedure.

  - ### Uses of Handler in io.vertx.rxjava.ext.mail

    Methods in io.vertx.rxjava.ext.mail with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `MailClient` | MailClient.`sendMail(MailMessage email, Handler<AsyncResult<MailResult>> resultHandler)` send a single mail via MailClient
    `MailService` | MailService.`sendMail(MailMessage email, Handler<AsyncResult<MailResult>> resultHandler)`

  - ### Uses of Handler in io.vertx.rxjava.ext.mongo

    Methods in io.vertx.rxjava.ext.mongo with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `MongoClient` | MongoClient.`bulkWrite(String collection, List<BulkOperation> operations, Handler<AsyncResult<MongoClientBulkWriteResult>> resultHandler)` Execute a bulk operation.
    `MongoClient` | MongoClient.`bulkWriteWithOptions(String collection, List<BulkOperation> operations, BulkWriteOptions bulkWriteOptions, Handler<AsyncResult<MongoClientBulkWriteResult>> resultHandler)` Execute a bulk operation with the specified write options.
    `MongoClient` | MongoClient.`count(String collection, JsonObject query, Handler<AsyncResult<Long>> resultHandler)` Count matching documents in a collection.
    `MongoClient` | MongoClient.`createCollection(String collectionName, Handler<AsyncResult<Void>> resultHandler)` Create a new collection
    `MongoClient` | MongoClient.`createIndex(String collection, JsonObject key, Handler<AsyncResult<Void>> resultHandler)` Creates an index.
    `MongoClient` | MongoClient.`createIndexWithOptions(String collection, JsonObject key, IndexOptions options, Handler<AsyncResult<Void>> resultHandler)` Creates an index.
    `MongoClient` | MongoClient.`distinct(String collection, String fieldName, String resultClassname, Handler<AsyncResult<JsonArray>> resultHandler)` Gets the distinct values of the specified field name.
    `MongoClient` | MongoClient.`distinctBatch(String collection, String fieldName, String resultClassname, Handler<AsyncResult<JsonObject>> resultHandler)` Gets the distinct values of the specified field name.
    `MongoClient` | MongoClient.`dropCollection(String collection, Handler<AsyncResult<Void>> resultHandler)` Drop a collection
    `MongoClient` | MongoClient.`dropIndex(String collection, String indexName, Handler<AsyncResult<Void>> resultHandler)` Drops the index given its name.
    `MongoClient` | MongoClient.`find(String collection, JsonObject query, Handler<AsyncResult<List<JsonObject>>> resultHandler)` Find matching documents in the specified collection
    `MongoClient` | MongoClient.`findBatch(String collection, JsonObject query, Handler<AsyncResult<JsonObject>> resultHandler)` Find matching documents in the specified collection.
    `MongoClient` | MongoClient.`findBatchWithOptions(String collection, JsonObject query, FindOptions options, Handler<AsyncResult<JsonObject>> resultHandler)` Find matching documents in the specified collection, specifying options.
    `MongoClient` | MongoClient.`findOne(String collection, JsonObject query, JsonObject fields, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection
    `MongoClient` | MongoClient.`findOneAndDelete(String collection, JsonObject query, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and delete it.
    `MongoClient` | MongoClient.`findOneAndDeleteWithOptions(String collection, JsonObject query, FindOptions findOptions, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and delete it.
    `MongoClient` | MongoClient.`findOneAndReplace(String collection, JsonObject query, JsonObject replace, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and replace it.
    `MongoClient` | MongoClient.`findOneAndReplaceWithOptions(String collection, JsonObject query, JsonObject replace, FindOptions findOptions, UpdateOptions updateOptions, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and replace it.
    `MongoClient` | MongoClient.`findOneAndUpdate(String collection, JsonObject query, JsonObject update, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and update it.
    `MongoClient` | MongoClient.`findOneAndUpdateWithOptions(String collection, JsonObject query, JsonObject update, FindOptions findOptions, UpdateOptions updateOptions, Handler<AsyncResult<JsonObject>> resultHandler)` Find a single matching document in the specified collection and update it.
    `MongoClient` | MongoClient.`findWithOptions(String collection, JsonObject query, FindOptions options, Handler<AsyncResult<List<JsonObject>>> resultHandler)` Find matching documents in the specified collection, specifying options
    `MongoClient` | MongoClient.`getCollections(Handler<AsyncResult<List<String>>> resultHandler)` Get a list of all collections in the database.
    `MongoClient` | MongoClient.`insert(String collection, JsonObject document, Handler<AsyncResult<String>> resultHandler)` Insert a document in the specified collection
    `MongoClient` | MongoClient.`insertWithOptions(String collection, JsonObject document, WriteOption writeOption, Handler<AsyncResult<String>> resultHandler)` Insert a document in the specified collection with the specified write option
    `MongoClient` | MongoClient.`listIndexes(String collection, Handler<AsyncResult<JsonArray>> resultHandler)` Get all the indexes in this collection.
    `MongoClient` | MongoClient.`remove(String collection, JsonObject query, Handler<AsyncResult<Void>> resultHandler)` Remove matching documents from a collection
    `MongoClient` | MongoClient.`removeDocument(String collection, JsonObject query, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove a single matching document from a collection and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeDocuments(String collection, JsonObject query, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove matching documents from a collection and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeDocumentsWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove matching documents from a collection with the specified write option and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeDocumentWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<MongoClientDeleteResult>> resultHandler)` Remove a single matching document from a collection with the specified write option and return the handler with MongoClientDeleteResult result
    `MongoClient` | MongoClient.`removeOne(String collection, JsonObject query, Handler<AsyncResult<Void>> resultHandler)` Remove a single matching document from a collection
    `MongoClient` | MongoClient.`removeOneWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<Void>> resultHandler)` Remove a single matching document from a collection with the specified write option
    `MongoClient` | MongoClient.`removeWithOptions(String collection, JsonObject query, WriteOption writeOption, Handler<AsyncResult<Void>> resultHandler)` Remove matching documents from a collection with the specified write option
    `MongoClient` | MongoClient.`replace(String collection, JsonObject query, JsonObject replace, Handler<AsyncResult<Void>> resultHandler)` Replace matching documents in the specified collection
    `MongoClient` | MongoClient.`replaceDocuments(String collection, JsonObject query, JsonObject replace, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Replace matching documents in the specified collection and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`replaceDocumentsWithOptions(String collection, JsonObject query, JsonObject replace, UpdateOptions options, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Replace matching documents in the specified collection, specifying options and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`replaceWithOptions(String collection, JsonObject query, JsonObject replace, UpdateOptions options, Handler<AsyncResult<Void>> resultHandler)` Replace matching documents in the specified collection, specifying options
    `MongoClient` | MongoClient.`runCommand(String commandName, JsonObject command, Handler<AsyncResult<JsonObject>> resultHandler)` Run an arbitrary MongoDB command.
    `MongoClient` | MongoClient.`save(String collection, JsonObject document, Handler<AsyncResult<String>> resultHandler)` Save a document in the specified collection
    `MongoClient` | MongoClient.`saveWithOptions(String collection, JsonObject document, WriteOption writeOption, Handler<AsyncResult<String>> resultHandler)` Save a document in the specified collection with the specified write option
    `MongoClient` | MongoClient.`update(String collection, JsonObject query, JsonObject update, Handler<AsyncResult<Void>> resultHandler)` Update matching documents in the specified collection
    `MongoClient` | MongoClient.`updateCollection(String collection, JsonObject query, JsonObject update, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Update matching documents in the specified collection and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`updateCollectionWithOptions(String collection, JsonObject query, JsonObject update, UpdateOptions options, Handler<AsyncResult<MongoClientUpdateResult>> resultHandler)` Update matching documents in the specified collection, specifying options and return the handler with MongoClientUpdateResult result
    `MongoClient` | MongoClient.`updateWithOptions(String collection, JsonObject query, JsonObject update, UpdateOptions options, Handler<AsyncResult<Void>> resultHandler)` Update matching documents in the specified collection, specifying options

  - ### Uses of Handler in io.vertx.rxjava.ext.shell

    Methods in io.vertx.rxjava.ext.shell with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ShellServer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the shell server, this is an asynchronous close.
    `ShellServer` | ShellServer.`listen(Handler<AsyncResult<Void>> listenHandler)` Start the shell service, this is an asynchronous start.
    `void` | ShellService.`start(Handler<AsyncResult<Void>> startHandler)` Start the shell service, this is an asynchronous start.
    `void` | ShellService.`stop(Handler<AsyncResult<Void>> stopHandler)` Stop the shell service, this is an asynchronous start.

  - ### Uses of Handler in io.vertx.rxjava.ext.shell.command

    Methods in io.vertx.rxjava.ext.shell.command with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `CommandProcess` | CommandProcess.`backgroundHandler(Handler<Void> handler)` Set a background handler, this handler is called when the command is running and put to background.
    `CommandBuilder` | CommandBuilder.`completionHandler(Handler<Completion> handler)` Set the command completion handler, the completion handler when the user asks for contextual command line completion, usually hitting the tab key.
    `CommandProcess` | CommandProcess.`endHandler(Handler<Void> handler)` Set an end handler, this handler is called when the command is ended, for instance the command is running and the shell closes.
    `CommandProcess` | CommandProcess.`foregroundHandler(Handler<Void> handler)` Set a foreground handler, this handler is called when the command is running and put to foreground.
    `CommandProcess` | CommandProcess.`interruptHandler(Handler<Void> handler)` Set an interrupt handler, this handler is called when the command is interrupted, for instance user press `Ctrl-C`.
    `CommandBuilder` | CommandBuilder.`processHandler(Handler<CommandProcess> handler)` Set the command process handler, the process handler is called when the command is executed.
    `CommandRegistry` | CommandRegistry.`registerCommand(Command command, Handler<AsyncResult<Command>> completionHandler)` Register a command
    `CommandRegistry` | CommandRegistry.`registerCommands(List<Command> commands, Handler<AsyncResult<List<Command>>> completionHandler)` Register a list of commands.
    `CommandProcess` | CommandProcess.`resizehandler(Handler<Void> handler)`
    `CommandProcess` | CommandProcess.`resumeHandler(Handler<Void> handler)` Set a resume handler, this handler is called when the command is resumed, for instance user types `bg` or `fg` to resume the command.
    `CommandProcess` | CommandProcess.`stdinHandler(Handler<String> handler)`
    `CommandProcess` | CommandProcess.`suspendHandler(Handler<Void> handler)` Set a suspend handler, this handler is called when the command is suspended, for instance user press `Ctrl-Z`.
    `CommandRegistry` | CommandRegistry.`unregisterCommand(String commandName, Handler<AsyncResult<Void>> completionHandler)` Unregister a command.

  - ### Uses of Handler in io.vertx.rxjava.ext.shell.system

    Methods in io.vertx.rxjava.ext.shell.system with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | JobController.`close(Handler<Void> completionHandler)` Close the controller and terminate all the underlying jobs, a closed controller does not accept anymore jobs.
    `boolean` | Process.`interrupt(Handler<Void> completionHandler)` Attempt to interrupt the process.
    `void` | Process.`resume(boolean foreground, Handler<Void> completionHandler)` Suspend the process.
    `void` | Process.`resume(Handler<Void> completionHandler)` Suspend the process.
    `Job` | Job.`statusUpdateHandler(Handler<ExecStatus> handler)` Set an handler called when the job terminates.
    `void` | Process.`suspend(Handler<Void> completionHandler)` Resume the process.
    `void` | Process.`terminate(Handler<Void> completionHandler)` Terminate the process.
    `Process` | Process.`terminatedHandler(Handler<Integer> handler)` Set an handler for being notified when the process terminates.
    `void` | Process.`toBackground(Handler<Void> completionHandler)` Set the process in background.
    `void` | Process.`toForeground(Handler<Void> completionHandler)` Set the process in foreground.

  - ### Uses of Handler in io.vertx.rxjava.ext.shell.term

    Classes in io.vertx.rxjava.ext.shell.term that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `SockJSTermHandler` NOTE: This class has been automatically generated from the `original` non RX-ified interface using Vert.x codegen.

    Methods in io.vertx.rxjava.ext.shell.term with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | TermServer.`close(Handler<AsyncResult<Void>> completionHandler)` Like `TermServer.close()` but supplying a handler that will be notified when close is complete.
    `Term` | Term.`closeHandler(Handler<Void> handler)` Set a handler that will be called when the terminal is closed.
    `TermServer` | TermServer.`listen(Handler<AsyncResult<TermServer>> listenHandler)` Bind the term server, the `TermServer.termHandler(io.vertx.core.Handler<io.vertx.rxjava.ext.shell.term.Term>)` must be set before.
    `void` | Term.`readline(String prompt, Handler<String> lineHandler)` Prompt the user a line of text.
    `void` | Term.`readline(String prompt, Handler<String> lineHandler, Handler<Completion> completionHandler)` Prompt the user a line of text, providing a completion handler to handle user's completion.
    `void` | Term.`readline(String prompt, Handler<String> lineHandler, Handler<Completion> completionHandler)` Prompt the user a line of text, providing a completion handler to handle user's completion.
    `Term` | Term.`resizehandler(Handler<Void> handler)`
    `Tty` | Tty.`resizehandler(Handler<Void> handler)` Set a resize handler, the handler is called when the tty size changes.
    `Term` | Term.`stdinHandler(Handler<String> handler)`
    `Tty` | Tty.`stdinHandler(Handler<String> handler)` Set a stream handler on the standard input to read the data.
    `Pty` | Pty.`stdoutHandler(Handler<String> handler)` Set the standard out handler of the pseudo terminal.
    `SockJSTermHandler` | SockJSTermHandler.`termHandler(Handler<Term> handler)`
    `TermServer` | TermServer.`termHandler(Handler<Term> handler)` Set the term handler that will receive incoming client connections.

  - ### Uses of Handler in io.vertx.rxjava.ext.sql

    Methods in io.vertx.rxjava.ext.sql with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `SQLConnection` | SQLConnection.`batch(List<String> sqlStatements, Handler<AsyncResult<List<Integer>>> handler)` Batch simple SQL strings and execute the batch where the async result contains a array of Integers.
    `SQLConnection` | SQLConnection.`batchCallableWithParams(String sqlStatement, List<JsonArray> inArgs, List<JsonArray> outArgs, Handler<AsyncResult<List<Integer>>> handler)` Batch a callable statement with all entries from the args list.
    `SQLConnection` | SQLConnection.`batchWithParams(String sqlStatement, List<JsonArray> args, Handler<AsyncResult<List<Integer>>> handler)` Batch a prepared statement with all entries from the args list.
    `SQLConnection` | SQLConnection.`call(String sql, Handler<AsyncResult<ResultSet>> resultHandler)` Calls the given SQL `PROCEDURE` which returns the result from the procedure.
    `SQLConnection` | SQLConnection.`callWithParams(String sql, JsonArray params, JsonArray outputs, Handler<AsyncResult<ResultSet>> resultHandler)` Calls the given SQL `PROCEDURE` which returns the result from the procedure.
    `void` | SQLClient.`close(Handler<AsyncResult<Void>> completionHandler)` Close the client and release all resources.
    `void` | SQLConnection.`close(Handler<AsyncResult<Void>> handler)` Closes the connection.
    `void` | SQLRowStream.`close(Handler<AsyncResult<Void>> handler)` Closes the stream/underlying cursor(s).
    `SQLConnection` | SQLConnection.`commit(Handler<AsyncResult<Void>> handler)` Commits all changes made since the previous commit/rollback.
    `SQLRowStream` | SQLRowStream.`endHandler(Handler<Void> endHandler)`
    `SQLRowStream` | SQLRowStream.`exceptionHandler(Handler<Throwable> handler)`
    `SQLConnection` | SQLConnection.`execute(String sql, Handler<AsyncResult<Void>> resultHandler)` Executes the given SQL statement
    `SQLClient` | SQLClient.`getConnection(Handler<AsyncResult<SQLConnection>> handler)` Returns a connection that can be used to perform SQL operations on.
    `SQLConnection` | SQLConnection.`getTransactionIsolation(Handler<AsyncResult<TransactionIsolation>> handler)` Attempts to return the transaction isolation level for this Connection object to the one given.
    `SQLRowStream` | SQLRowStream.`handler(Handler<JsonArray> handler)`
    `SQLConnection` | SQLConnection.`query(String sql, Handler<AsyncResult<ResultSet>> resultHandler)` Executes the given SQL `SELECT` statement which returns the results of the query.
    `SQLConnection` | SQLConnection.`queryStream(String sql, Handler<AsyncResult<SQLRowStream>> handler)` Executes the given SQL `SELECT` statement which returns the results of the query as a read stream.
    `SQLConnection` | SQLConnection.`queryStreamWithParams(String sql, JsonArray params, Handler<AsyncResult<SQLRowStream>> handler)` Executes the given SQL `SELECT` statement which returns the results of the query as a read stream.
    `SQLConnection` | SQLConnection.`queryWithParams(String sql, JsonArray params, Handler<AsyncResult<ResultSet>> resultHandler)` Executes the given SQL `SELECT` prepared statement which returns the results of the query.
    `SQLRowStream` | SQLRowStream.`resultSetClosedHandler(Handler<Void> handler)` Event handler when a resultset is closed.
    `SQLConnection` | SQLConnection.`rollback(Handler<AsyncResult<Void>> handler)` Rolls back all changes made since the previous commit/rollback.
    `SQLConnection` | SQLConnection.`setAutoCommit(boolean autoCommit, Handler<AsyncResult<Void>> resultHandler)` Sets the auto commit flag for this connection.
    `SQLConnection` | SQLConnection.`setTransactionIsolation(TransactionIsolation isolation, Handler<AsyncResult<Void>> handler)` Attempts to change the transaction isolation level for this Connection object to the one given.
    `SQLConnection` | SQLConnection.`update(String sql, Handler<AsyncResult<UpdateResult>> resultHandler)` Executes the given SQL statement which may be an `INSERT`, `UPDATE`, or `DELETE` statement.
    `SQLConnection` | SQLConnection.`updateWithParams(String sql, JsonArray params, Handler<AsyncResult<UpdateResult>> resultHandler)` Executes the given prepared statement which may be an `INSERT`, `UPDATE`, or `DELETE` statement with the given parameters

  - ### Uses of Handler in io.vertx.rxjava.ext.stomp

    Classes in io.vertx.rxjava.ext.stomp that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `StompServerHandler` STOMP server handler implements the behavior of the STOMP server when a specific event occurs.

    Methods in io.vertx.rxjava.ext.stomp that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<ServerWebSocket>` | StompServer.`webSocketHandler()` Gets the able to manage web socket connections.

    Methods in io.vertx.rxjava.ext.stomp with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `StompClientConnection` | StompClientConnection.`abort(String id, Handler<Frame> receiptHandler)` Aborts a transaction.
    `StompClientConnection` | StompClientConnection.`abort(String id, Map<String,String> headers, Handler<Frame> receiptHandler)` Aborts a transaction.
    `StompServerHandler` | StompServerHandler.`abortHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `ABORT` frame is received.
    `StompClientConnection` | StompClientConnection.`ack(String id, Handler<Frame> receiptHandler)` Sends an acknowledgement for a specific message.
    `StompClientConnection` | StompClientConnection.`ack(String id, String txId, Handler<Frame> receiptHandler)` Sends an acknowledgement for the given frame.
    `StompServerHandler` | StompServerHandler.`ackHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `ACK` frame is received.
    `StompServerHandler` | StompServerHandler.`beginHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `BEGIN` frame is received.
    `StompClientConnection` | StompClientConnection.`beginTX(String id, Handler<Frame> receiptHandler)` Begins a transaction.
    `StompClientConnection` | StompClientConnection.`beginTX(String id, Map<String,String> headers, Handler<Frame> receiptHandler)` Begins a transaction.
    `void` | StompServer.`close(Handler<AsyncResult<Void>> completionHandler)` Closes the server.
    `StompClientConnection` | StompClientConnection.`closeHandler(Handler<StompClientConnection> handler)` Sets a handler notified when the STOMP connection is closed.
    `StompServerHandler` | StompServerHandler.`closeHandler(Handler<StompServerConnection> handler)` Configures the action to execute when a connection with the client is closed.
    `StompClientConnection` | StompClientConnection.`commit(String id, Handler<Frame> receiptHandler)` Commits a transaction.
    `StompClientConnection` | StompClientConnection.`commit(String id, Map<String,String> headers, Handler<Frame> receiptHandler)` Commits a transaction.
    `StompServerHandler` | StompServerHandler.`commitHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `COMMIT` frame is received.
    `void` | StompServerConnection.`configureHeartbeat(long ping, long pong, Handler<StompServerConnection> pingHandler)` Configures the heartbeat.
    `StompClient` | StompClient.`connect(Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server using the host and port configured in the client's options.
    `StompClient` | StompClient.`connect(int port, String host, Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server.
    `StompClient` | StompClient.`connect(int port, String host, NetClient net, Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server.
    `StompClient` | StompClient.`connect(NetClient net, Handler<AsyncResult<StompClientConnection>> resultHandler)` Connects to the server.
    `StompServerHandler` | StompServerHandler.`connectHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `CONNECT` frame is received.
    `StompClientConnection` | StompClientConnection.`connectionDroppedHandler(Handler<StompClientConnection> handler)` Sets a handler notified when the server does not respond to a `ping` request in time.
    `StompClientConnection` | StompClientConnection.`disconnect(Frame frame, Handler<Frame> receiptHandler)` Disconnects the client.
    `StompClientConnection` | StompClientConnection.`disconnect(Handler<Frame> receiptHandler)` Disconnects the client.
    `StompServerHandler` | StompServerHandler.`disconnectHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `DISCONNECT` frame is received.
    `StompClient` | StompClient.`errorFrameHandler(Handler<Frame> handler)` A general error frame handler.
    `StompClientConnection` | StompClientConnection.`errorHandler(Handler<Frame> handler)` Sets a handler notified when an `ERROR` frame is received by the client.
    `StompServer` | StompServer.`listen(Handler<AsyncResult<StompServer>> handler)` Connects the STOMP server default port (61613) and network interface (`0.0.0.0`).
    `StompServer` | StompServer.`listen(int port, Handler<AsyncResult<StompServer>> handler)` Connects the STOMP server to the given port.
    `StompServer` | StompServer.`listen(int port, String host, Handler<AsyncResult<StompServer>> handler)` Connects the STOMP server to the given port / interface.
    `StompClientConnection` | StompClientConnection.`nack(String id, Handler<Frame> receiptHandler)` Sends a non-acknowledgement for the given message.
    `StompClientConnection` | StompClientConnection.`nack(String id, String txId, Handler<Frame> receiptHandler)` Sends a non-acknowledgement for the given frame.
    `StompServerHandler` | StompServerHandler.`nackHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `NACK` frame is received.
    `StompServerHandler` | StompServerHandler.`onAckHandler(Handler<Acknowledgement> handler)` Configures the action to execute when messages are acknowledged.
    `StompServerHandler` | StompServerHandler.`onAuthenticationRequest(StompServer server, String login, String passcode, Handler<AsyncResult<Boolean>> handler)` Called when the client connects to a server requiring authentication.
    `StompServerHandler` | StompServerHandler.`onNackHandler(Handler<Acknowledgement> handler)` Configures the action to execute when messages are not acknowledged.
    `StompClientConnection` | StompClientConnection.`pingHandler(Handler<StompClientConnection> handler)` Sets a handler that let customize the behavior when a ping needs to be sent to the server.
    `StompServerHandler` | StompServerHandler.`pingHandler(Handler<StompServerConnection> handler)` Allows customizing the action to do when the server needs to send a `PING` to the client.
    `StompClient` | StompClient.`receivedFrameHandler(Handler<Frame> handler)` Configures a received handler that gets notified when a STOMP frame is received by the client.
    `StompClientConnection` | StompClientConnection.`receivedFrameHandler(Handler<Frame> handler)` Configures a received handler that get notified when a STOMP frame is received by the client.
    `StompServerHandler` | StompServerHandler.`receivedFrameHandler(Handler<ServerFrame> handler)` Configures a handler that get notified when a STOMP frame is received by the server.
    `StompClientConnection` | StompClientConnection.`send(Frame frame, Handler<Frame> receiptHandler)` Sends the given frame to the server.
    `StompClientConnection` | StompClientConnection.`send(Map<String,String> headers, Buffer body, Handler<Frame> receiptHandler)` Sends a `SEND` frame to the server.
    `StompClientConnection` | StompClientConnection.`send(String destination, Buffer body, Handler<Frame> receiptHandler)` Sends a `SEND` frame to the server to the given destination.
    `StompClientConnection` | StompClientConnection.`send(String destination, Map<String,String> headers, Buffer body, Handler<Frame> receiptHandler)` Sends a `SEND` frame to the server to the given destination.
    `StompServerHandler` | StompServerHandler.`sendHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `SEND` frame is received.
    `StompServerHandler` | StompServerHandler.`stompHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `STOMP` frame is received.
    `String` | StompClientConnection.`subscribe(String destination, Handler<Frame> handler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Map<String,String> headers, Handler<Frame> handler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Map<String,String> headers, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `String` | StompClientConnection.`subscribe(String destination, Map<String,String> headers, Handler<Frame> handler, Handler<Frame> receiptHandler)` Subscribes to the given destination.
    `StompServerHandler` | StompServerHandler.`subscribeHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `SUBSCRIBE` frame is received.
    `StompClientConnection` | StompClientConnection.`unsubscribe(String destination, Handler<Frame> receiptHandler)` Un-subscribes from the given destination.
    `StompClientConnection` | StompClientConnection.`unsubscribe(String destination, Map<String,String> headers, Handler<Frame> receiptHandler)` Un-subscribes from the given destination.
    `StompServerHandler` | StompServerHandler.`unsubscribeHandler(Handler<ServerFrame> handler)` Configures the action to execute when a `UNSUBSCRIBE` frame is received.
    `StompClient` | StompClient.`writingFrameHandler(Handler<Frame> handler)` Configures a writing handler that gets notified when a STOMP frame is written on the wire.
    `StompClientConnection` | StompClientConnection.`writingFrameHandler(Handler<Frame> handler)` Configures a handler notified when a frame is going to be written on the wire.
    `StompServer` | StompServer.`writingFrameHandler(Handler<ServerFrame> handler)` Configures the handler that is invoked every time a frame is going to be written to the "wire".

  - ### Uses of Handler in io.vertx.rxjava.ext.unit

    Methods in io.vertx.rxjava.ext.unit that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertFailure()` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a failed result it completes the async operation. When the returned handler is called back with a succeeded result it fails the test.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertFailure(Handler<Throwable> causeHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a failed result it completes the async operation. When the returned handler is called back with a succeeded result it fails the test.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertSuccess()` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a succeeded result it completes the async operation. When the returned handler is called back with a failed result it fails the test with the cause of the failure.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertSuccess(Handler<T> resultHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a succeeded result it invokes the `resultHandler` argument with the async result.
    `Handler<Throwable>` | TestContext.`exceptionHandler()`

    Methods in io.vertx.rxjava.ext.unit with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `TestSuite` | TestSuite.`after(Handler<TestContext> callback)` Set a callback executed after the tests.
    `TestSuite` | TestSuite.`afterEach(Handler<TestContext> callback)` Set a callback executed after each test and before the suite `after` callback.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertFailure(Handler<Throwable> causeHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a failed result it completes the async operation. When the returned handler is called back with a succeeded result it fails the test.
    `<T> Handler<AsyncResult<T>>` | TestContext.`asyncAssertSuccess(Handler<T> resultHandler)` Creates and returns a new async handler, the returned handler controls the completion of the test. When the returned handler is called back with a succeeded result it invokes the `resultHandler` argument with the async result.
    `TestSuite` | TestSuite.`before(Handler<TestContext> callback)` Set a callback executed before the tests.
    `TestSuite` | TestSuite.`beforeEach(Handler<TestContext> callback)` Set a callback executed before each test and after the suite `before` callback.
    `static TestCase` | TestCase.`create(String name, Handler<TestContext> testCase)` Create a test case.
    `void` | Completion.`handler(Handler<AsyncResult<T>> completionHandler)` Completion handler to receive a completion signal when this completions completes.
    `void` | Async.`handler(Handler<AsyncResult<Void>> completionHandler)` Completion handler to receive a completion signal when this completions completes.
    `void` | TestCompletion.`handler(Handler<AsyncResult<Void>> completionHandler)` Completion handler to receive a completion signal when this completions completes.
    `TestSuite` | TestSuite.`test(String name, Handler<TestContext> testCase)` Add a new test case to the suite.
    `TestSuite` | TestSuite.`test(String name, int repeat, Handler<TestContext> testCase)` Add a new test case to the suite.

  - ### Uses of Handler in io.vertx.rxjava.ext.unit.collect

    Methods in io.vertx.rxjava.ext.unit.collect with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static EventBusCollector` | EventBusCollector.`create(Vertx vertx, Handler<TestSuiteReport> reporter)`

  - ### Uses of Handler in io.vertx.rxjava.ext.unit.report

    Methods in io.vertx.rxjava.ext.unit.report with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `TestCaseReport` | TestCaseReport.`endHandler(Handler<TestResult> handler)` Set a callback for completion, the specified `handler` is invoked when the test exec has completed.
    `TestSuiteReport` | TestSuiteReport.`endHandler(Handler<Void> endHandler)`
    `TestSuiteReport` | TestSuiteReport.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler, the exception handler reports the test suite errors, it can be called mulitple times before the test ends.
    `TestSuiteReport` | TestSuiteReport.`handler(Handler<TestCaseReport> handler)`

  - ### Uses of Handler in io.vertx.rxjava.ext.web

    Methods in io.vertx.rxjava.ext.web with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `int` | RoutingContext.`addBodyEndHandler(Handler<Void> handler)` Provides a handler that will be called after the last part of the body is written to the wire.
    `int` | RoutingContext.`addHeadersEndHandler(Handler<Void> handler)` Add a handler that will be called just before headers are written to the response.
    `Route` | Route.`blockingHandler(Handler<RoutingContext> requestHandler)` Like `Route.blockingHandler(io.vertx.core.Handler<io.vertx.rxjava.ext.web.RoutingContext>)` called with ordered = true
    `Route` | Route.`blockingHandler(Handler<RoutingContext> requestHandler, boolean ordered)` Specify a blocking request handler for the route.
    `Router` | Router.`exceptionHandler(Handler<Throwable> exceptionHandler)` Specify a handler for any unhandled exceptions on this router.
    `Route` | Route.`failureHandler(Handler<RoutingContext> failureHandler)` Specify a failure handler for the route.
    `Route` | Route.`handler(Handler<RoutingContext> requestHandler)` Specify a request handler for the route.

  - ### Uses of Handler in io.vertx.rxjava.ext.web.client

    Methods in io.vertx.rxjava.ext.web.client with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | HttpRequest.`send(Handler<AsyncResult<HttpResponse<T>>> handler)` Send a request, the `handler` will receive the response as an `HttpResponse`.
    `void` | HttpRequest.`sendBuffer(Buffer body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.ext.web.client.HttpResponse<T>>>)` but with an HTTP request `body` buffer.
    `void` | HttpRequest.`sendForm(MultiMap body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.ext.web.client.HttpResponse<T>>>)` but with an HTTP request `body` multimap encoded as form and the content type set to `application/x-www-form-urlencoded`.
    `void` | HttpRequest.`sendJson(Object body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.ext.web.client.HttpResponse<T>>>)` but with an HTTP request `body` object encoded as json and the content type set to `application/json`.
    `void` | HttpRequest.`sendJsonObject(JsonObject body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.ext.web.client.HttpResponse<T>>>)` but with an HTTP request `body` object encoded as json and the content type set to `application/json`.
    `void` | HttpRequest.`sendStream(rx.Observable<Buffer> body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.ext.web.client.HttpResponse<T>>>)` but with an HTTP request `body` stream.
    `void` | HttpRequest.`sendStream(ReadStream<Buffer> body, Handler<AsyncResult<HttpResponse<T>>> handler)` Like `HttpRequest.send(io.vertx.core.Handler<io.vertx.core.AsyncResult<io.vertx.rxjava.ext.web.client.HttpResponse<T>>>)` but with an HTTP request `body` stream.

  - ### Uses of Handler in io.vertx.rxjava.ext.web.handler

    Classes in io.vertx.rxjava.ext.web.handler that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `BasicAuthHandler` An auth handler that provides HTTP Basic Authentication support.
    `class` | `BodyHandler` A handler which gathers the entire request body and sets it on the .
    `class` | `CookieHandler` A handler which decodes cookies from the request, makes them available in the and writes them back in the response.
    `class` | `CorsHandler` A handler which implements server side http://www.w3.org/TR/cors/[CORS] support for Vert.x-Web.
    `class` | `CSRFHandler` This handler adds a CSRF token to requests which mutate state.
    `class` | `DigestAuthHandler` An auth handler that provides HTTP Basic Authentication support.
    `class` | `ErrorHandler` A pretty error handler for rendering error pages.
    `class` | `FaviconHandler` A handler that serves favicons.
    `class` | `FormLoginHandler` Handler that handles login from a form on a custom login page.
    `class` | `JWTAuthHandler` An auth handler that provides JWT Authentication support.
    `class` | `LoggerHandler` A handler which logs request information to the Vert.x logger.
    `class` | `OAuth2AuthHandler` An auth handler that provides OAuth2 Authentication support.
    `class` | `RedirectAuthHandler` An auth handler that's used to handle auth by redirecting user to a custom login page.
    `class` | `ResponseContentTypeHandler` A handler which sets the response content type automatically according to the best `Accept` header match.
    `class` | `ResponseTimeHandler` Handler which adds a header `x-response-time` in the response of matching requests containing the time taken in ms to process the request.
    `class` | `SessionHandler` A handler that maintains a `Session` for each browser session.
    `class` | `StaticHandler` A handler for serving static resources from the file system or classpath.
    `class` | `TemplateHandler` A handler which renders responses using a template engine and where the template name is selected from the URI path.
    `class` | `TimeoutHandler` Handler that will timeout requests if the response has not been written after a certain time.
    `class` | `UserSessionHandler` This handler should be used if you want to store the User object in the Session so it's available between different requests, without you having re-authenticate each time.
    `class` | `VirtualHostHandler` Handler that will filter requests based on the request Host name.

    Methods in io.vertx.rxjava.ext.web.handler with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static VirtualHostHandler` | VirtualHostHandler.`create(String hostname, Handler<RoutingContext> handler)` Create a handler

  - ### Uses of Handler in io.vertx.rxjava.ext.web.handler.sockjs

    Classes in io.vertx.rxjava.ext.web.handler.sockjs that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `SockJSHandler` A handler that allows you to handle SockJS connections from clients.

    Methods in io.vertx.rxjava.ext.web.handler.sockjs that return Handler
    Modifier and Type | Method and Description
    --- | ---
    `Handler<AsyncResult<Boolean>>` | BridgeEvent.`completer()`

    Methods in io.vertx.rxjava.ext.web.handler.sockjs with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `SockJSHandler` | SockJSHandler.`bridge(BridgeOptions bridgeOptions, Handler<BridgeEvent> bridgeEventHandler)` Like `SockJSHandler.bridge(io.vertx.ext.web.handler.sockjs.BridgeOptions)` but specifying a handler that will receive bridge events.
    `<U> Future<U>` | BridgeEvent.`compose(Handler<Boolean> handler, Future<U> next)`
    `SockJSSocket` | SockJSSocket.`drainHandler(Handler<Void> handler)`
    `SockJSSocket` | SockJSSocket.`endHandler(Handler<Void> endHandler)`
    `SockJSSocket` | SockJSSocket.`exceptionHandler(Handler<Throwable> handler)`
    `SockJSSocket` | SockJSSocket.`handler(Handler<Buffer> handler)`
    `Future<Boolean>` | BridgeEvent.`setHandler(Handler<AsyncResult<Boolean>> arg0)`
    `SockJSHandler` | SockJSHandler.`socketHandler(Handler<SockJSSocket> handler)` Set a SockJS socket handler.

  - ### Uses of Handler in io.vertx.rxjava.ext.web.sstore

    Methods in io.vertx.rxjava.ext.web.sstore with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | SessionStore.`clear(Handler<AsyncResult<Boolean>> resultHandler)` Remove all sessions from the store
    `void` | SessionStore.`delete(String id, Handler<AsyncResult<Boolean>> resultHandler)` Delete the session with the specified ID
    `void` | SessionStore.`get(String id, Handler<AsyncResult<Session>> resultHandler)` Get the session with the specified ID
    `void` | SessionStore.`put(Session session, Handler<AsyncResult<Boolean>> resultHandler)` Add a session with the specified ID
    `void` | SessionStore.`size(Handler<AsyncResult<Integer>> resultHandler)` Get the number of sessions in the store

  - ### Uses of Handler in io.vertx.rxjava.ext.web.templ

    Methods in io.vertx.rxjava.ext.web.templ with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | TemplateEngine.`render(RoutingContext context, String templateFileName, Handler<AsyncResult<Buffer>> handler)` Render the template
    `void` | TemplateEngine.`render(RoutingContext context, String templateDirectory, String templateFileName, Handler<AsyncResult<Buffer>> handler)` Render the template

  - ### Uses of Handler in io.vertx.rxjava.kafka.admin

    Methods in io.vertx.rxjava.kafka.admin with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | AdminUtils.`changeTopicConfig(String topicName, Map<String,String> topicConfig, Handler<AsyncResult<Void>> completionHandler)` Updates the configuration of the topic given by topicName.
    `void` | AdminUtils.`close(Handler<AsyncResult<Void>> completionHandler)` Closes the underlying connection to Zookeeper.
    `void` | AdminUtils.`createTopic(String topicName, int partitionCount, int replicationFactor, Handler<AsyncResult<Void>> completionHandler)` Creates a new Kafka topic on all Brokers managed by the given Zookeeper instance(s)
    `void` | AdminUtils.`createTopic(String topicName, int partitionCount, int replicationFactor, Map<String,String> topicConfig, Handler<AsyncResult<Void>> completionHandler)` Creates a new Kafka topic on all Brokers managed by the given Zookeeper instance(s).
    `void` | AdminUtils.`deleteTopic(String topicName, Handler<AsyncResult<Void>> completionHandler)` Delete the Kafka topic given by the topicName.
    `void` | AdminUtils.`topicExists(String topicName, Handler<AsyncResult<Boolean>> completionHandler)` Checks if the Kafka topic given by topicName does exist.

  - ### Uses of Handler in io.vertx.rxjava.kafka.client.consumer

    Methods in io.vertx.rxjava.kafka.client.consumer with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `KafkaConsumer<K,V>` | KafkaConsumer.`assign(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Manually assign a list of partition to this consumer.
    `KafkaConsumer<K,V>` | KafkaConsumer.`assign(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Manually assign a partition to this consumer.
    `KafkaConsumer<K,V>` | KafkaConsumer.`assignment(Handler<AsyncResult<Set<TopicPartition>>> handler)` Get the set of partitions currently assigned to this consumer.
    `KafkaConsumer<K,V>` | KafkaConsumer.`batchHandler(Handler<KafkaConsumerRecords<K,V>> handler)` Set the handler to be used when batches of messages are fetched from the Kafka server.
    `void` | KafkaConsumer.`beginningOffsets(TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the first offset for the given partitions.
    `void` | KafkaConsumer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the consumer
    `void` | KafkaConsumer.`commit(Handler<AsyncResult<Void>> completionHandler)` Commit current offsets for all the subscribed list of topics and partition.
    `void` | KafkaConsumer.`committed(TopicPartition topicPartition, Handler<AsyncResult<OffsetAndMetadata>> handler)` Get the last committed offset for the given partition (whether the commit happened by this process or another).
    `KafkaConsumer<K,V>` | KafkaConsumer.`endHandler(Handler<Void> endHandler)`
    `void` | KafkaConsumer.`endOffsets(TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the last offset for the given partition.
    `KafkaConsumer<K,V>` | KafkaConsumer.`exceptionHandler(Handler<Throwable> handler)`
    `KafkaConsumer<K,V>` | KafkaConsumer.`handler(Handler<KafkaConsumerRecord<K,V>> handler)`
    `void` | KafkaConsumer.`offsetsForTimes(TopicPartition topicPartition, Long timestamp, Handler<AsyncResult<OffsetAndTimestamp>> handler)` Look up the offset for the given partition by timestamp.
    `KafkaConsumer<K,V>` | KafkaConsumer.`partitionsAssignedHandler(Handler<Set<TopicPartition>> handler)` Set the handler called when topic partitions are assigned to the consumer
    `KafkaConsumer<K,V>` | KafkaConsumer.`partitionsFor(String topic, Handler<AsyncResult<List<PartitionInfo>>> handler)` Get metadata about the partitions for a given topic.
    `KafkaConsumer<K,V>` | KafkaConsumer.`partitionsRevokedHandler(Handler<Set<TopicPartition>> handler)` Set the handler called when topic partitions are revoked to the consumer
    `KafkaConsumer<K,V>` | KafkaConsumer.`pause(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`pause(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partition.
    `void` | KafkaConsumer.`paused(Handler<AsyncResult<Set<TopicPartition>>> handler)` Get the set of partitions that were previously paused by a call to pause(Set).
    `void` | KafkaConsumer.`position(TopicPartition partition, Handler<AsyncResult<Long>> handler)` Get the offset of the next record that will be fetched (if a record with that offset exists).
    `KafkaConsumer<K,V>` | KafkaConsumer.`resume(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Resume specified partitions which have been paused with pause.
    `KafkaConsumer<K,V>` | KafkaConsumer.`resume(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Resume specified partition which have been paused with pause.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seek(TopicPartition topicPartition, long offset, Handler<AsyncResult<Void>> completionHandler)` Overrides the fetch offsets that the consumer will use on the next poll.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToBeginning(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToBeginning(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partition.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToEnd(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`seekToEnd(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partition.
    `KafkaConsumer<K,V>` | KafkaConsumer.`subscribe(Set<String> topics, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given list of topics to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`subscribe(String topic, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given topic to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | KafkaConsumer.`subscription(Handler<AsyncResult<Set<String>>> handler)` Get the current subscription.
    `KafkaConsumer<K,V>` | KafkaConsumer.`unsubscribe(Handler<AsyncResult<Void>> completionHandler)` Unsubscribe from topics currently subscribed with subscribe.

  - ### Uses of Handler in io.vertx.rxjava.kafka.client.producer

    Methods in io.vertx.rxjava.kafka.client.producer with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | KafkaProducer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the producer
    `void` | KafkaProducer.`close(long timeout, Handler<AsyncResult<Void>> completionHandler)` Close the producer
    `KafkaProducer<K,V>` | KafkaProducer.`drainHandler(Handler<Void> handler)`
    `KafkaProducer<K,V>` | KafkaProducer.`exceptionHandler(Handler<Throwable> handler)`
    `KafkaProducer<K,V>` | KafkaProducer.`flush(Handler<Void> completionHandler)` Invoking this method makes all buffered records immediately available to write
    `KafkaProducer<K,V>` | KafkaProducer.`partitionsFor(String topic, Handler<AsyncResult<List<PartitionInfo>>> handler)` Get the partition metadata for the give topic.
    `KafkaProducer<K,V>` | KafkaProducer.`write(KafkaProducerRecord<K,V> record, Handler<AsyncResult<RecordMetadata>> handler)` Asynchronously write a record to a topic

  - ### Uses of Handler in io.vertx.rxjava.mqtt

    Methods in io.vertx.rxjava.mqtt with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | MqttServer.`close(Handler<AsyncResult<Void>> completionHandler)` Close the server supplying an handler that will be called when the server is actually closed (or has failed).
    `MqttEndpoint` | MqttEndpoint.`closeHandler(Handler<Void> handler)` Set a close handler.
    `MqttEndpoint` | MqttEndpoint.`disconnectHandler(Handler<Void> handler)` Set a disconnect handler on the MQTT endpoint.
    `MqttServer` | MqttServer.`endpointHandler(Handler<MqttEndpoint> handler)` Set the endpoint handler for the server.
    `MqttEndpoint` | MqttEndpoint.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler.
    `MqttServer` | MqttServer.`exceptionHandler(Handler<Throwable> handler)` Set an exception handler for the server, that will be called when an error happens independantly of an accepted `MqttEndpoint`, like a rejected connection
    `MqttServer` | MqttServer.`listen(Handler<AsyncResult<MqttServer>> listenHandler)` Start the server listening for incoming connections using the specified options through the constructor
    `MqttServer` | MqttServer.`listen(int port, Handler<AsyncResult<MqttServer>> listenHandler)` Start the server listening for incoming connections on the port specified but on "0.0.0.0" as host.
    `MqttServer` | MqttServer.`listen(int port, String host, Handler<AsyncResult<MqttServer>> listenHandler)` Start the server listening for incoming connections on the port and host specified It ignores any options specified through the constructor
    `MqttEndpoint` | MqttEndpoint.`pingHandler(Handler<Void> handler)` Set the pingreq handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishAcknowledgeHandler(Handler<Integer> handler)` Set the puback handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishCompleteHandler(Handler<Integer> handler)` Set the pubcomp handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishHandler(Handler<MqttPublishMessage> handler)` Set the publish handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishReceivedHandler(Handler<Integer> handler)` Set the pubrec handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`publishReleaseHandler(Handler<Integer> handler)` Set the pubrel handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`subscribeHandler(Handler<MqttSubscribeMessage> handler)` Set a subscribe handler on the MQTT endpoint.
    `MqttEndpoint` | MqttEndpoint.`unsubscribeHandler(Handler<MqttUnsubscribeMessage> handler)` Set a unsubscribe handler on the MQTT endpoint.

  - ### Uses of Handler in io.vertx.rxjava.rabbitmq

    Methods in io.vertx.rxjava.rabbitmq with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | RabbitMQClient.`basicAck(long deliveryTag, boolean multiple, Handler<AsyncResult<JsonObject>> resultHandler)` Acknowledge one or several received messages.
    `void` | RabbitMQClient.`basicConsume(String queue, String address, boolean autoAck, Handler<AsyncResult<Void>> resultHandler)` Start a non-nolocal, non-exclusive consumer, with a server-generated consumerTag.
    `void` | RabbitMQClient.`basicConsume(String queue, String address, boolean autoAck, Handler<AsyncResult<Void>> resultHandler, Handler<Throwable> errorHandler)` Start a non-nolocal, non-exclusive consumer, with a server-generated consumerTag and error handler
    `void` | RabbitMQClient.`basicConsume(String queue, String address, boolean autoAck, Handler<AsyncResult<Void>> resultHandler, Handler<Throwable> errorHandler)` Start a non-nolocal, non-exclusive consumer, with a server-generated consumerTag and error handler
    `void` | RabbitMQClient.`basicConsume(String queue, String address, Handler<AsyncResult<Void>> resultHandler)` Start a non-nolocal, non-exclusive consumer, with auto acknowledgement and a server-generated consumerTag.
    `void` | RabbitMQClient.`basicGet(String queue, boolean autoAck, Handler<AsyncResult<JsonObject>> resultHandler)` Retrieve a message from a queue using AMQP.Basic.Get
    `void` | RabbitMQClient.`basicNack(long deliveryTag, boolean multiple, boolean requeue, Handler<AsyncResult<JsonObject>> resultHandler)` Reject one or several received messages.
    `void` | RabbitMQClient.`basicPublish(String exchange, String routingKey, JsonObject message, Handler<AsyncResult<Void>> resultHandler)` Publish a message.
    `void` | RabbitMQClient.`basicQos(int prefetchCount, Handler<AsyncResult<Void>> resultHandler)` Request specific "quality of service" settings, Limiting the number of unacknowledged messages on a channel (or connection).
    `void` | RabbitMQClient.`confirmSelect(Handler<AsyncResult<Void>> resultHandler)` Enables publisher acknowledgements on this channel.
    `void` | RabbitMQClient.`exchangeBind(String destination, String source, String routingKey, Handler<AsyncResult<Void>> resultHandler)` Bind an exchange to an exchange.
    `void` | RabbitMQClient.`exchangeDeclare(String exchange, String type, boolean durable, boolean autoDelete, Handler<AsyncResult<Void>> resultHandler)` Declare an exchange.
    `void` | RabbitMQClient.`exchangeDeclare(String exchange, String type, boolean durable, boolean autoDelete, Map<String,String> config, Handler<AsyncResult<Void>> resultHandler)` Declare an exchange with additional parameters such as dead lettering or an alternate exchnage.
    `void` | RabbitMQClient.`exchangeDelete(String exchange, Handler<AsyncResult<Void>> resultHandler)` Delete an exchange, without regard for whether it is in use or not.
    `void` | RabbitMQClient.`exchangeUnbind(String destination, String source, String routingKey, Handler<AsyncResult<Void>> resultHandler)` Unbind an exchange from an exchange.
    `void` | RabbitMQClient.`messageCount(String queue, Handler<AsyncResult<JsonObject>> resultHandler)` Returns the number of messages in a queue ready to be delivered.
    `void` | RabbitMQClient.`queueBind(String queue, String exchange, String routingKey, Handler<AsyncResult<Void>> resultHandler)` Bind a queue to an exchange
    `void` | RabbitMQClient.`queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Handler<AsyncResult<JsonObject>> resultHandler)` Declare a queue
    `void` | RabbitMQClient.`queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Map<String,String> config, Handler<AsyncResult<JsonObject>> resultHandler)` Declare a queue with config options
    `void` | RabbitMQClient.`queueDeclareAuto(Handler<AsyncResult<JsonObject>> resultHandler)` Actively declare a server-named exclusive, autodelete, non-durable queue.
    `void` | RabbitMQClient.`queueDelete(String queue, Handler<AsyncResult<JsonObject>> resultHandler)` Delete a queue, without regard for whether it is in use or has messages on it
    `void` | RabbitMQClient.`queueDeleteIf(String queue, boolean ifUnused, boolean ifEmpty, Handler<AsyncResult<JsonObject>> resultHandler)` Delete a queue
    `void` | RabbitMQClient.`start(Handler<AsyncResult<Void>> resultHandler)` Start the rabbitMQ client.
    `void` | RabbitMQClient.`stop(Handler<AsyncResult<Void>> resultHandler)` Stop the rabbitMQ client.
    `void` | RabbitMQClient.`waitForConfirms(Handler<AsyncResult<Void>> resultHandler)` Wait until all messages published since the last call have been either ack'd or nack'd by the broker.
    `void` | RabbitMQClient.`waitForConfirms(long timeout, Handler<AsyncResult<Void>> resultHandler)` Wait until all messages published since the last call have been either ack'd or nack'd by the broker; or until timeout elapses.

  - ### Uses of Handler in io.vertx.rxjava.redis

    Methods in io.vertx.rxjava.redis with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `RedisClient` | RedisClient.`append(String key, String value, Handler<AsyncResult<Long>> handler)` Append a value to a key
    `RedisTransaction` | RedisTransaction.`append(String key, String value, Handler<AsyncResult<String>> handler)` Append a value to a key
    `RedisClient` | RedisClient.`auth(String password, Handler<AsyncResult<String>> handler)` Authenticate to the server
    `RedisTransaction` | RedisTransaction.`auth(String password, Handler<AsyncResult<String>> handler)` Authenticate to the server
    `RedisClient` | RedisClient.`bgrewriteaof(Handler<AsyncResult<String>> handler)` Asynchronously rewrite the append-only file
    `RedisTransaction` | RedisTransaction.`bgrewriteaof(Handler<AsyncResult<String>> handler)` Asynchronously rewrite the append-only file
    `RedisClient` | RedisClient.`bgsave(Handler<AsyncResult<String>> handler)` Asynchronously save the dataset to disk
    `RedisTransaction` | RedisTransaction.`bgsave(Handler<AsyncResult<String>> handler)` Asynchronously save the dataset to disk
    `RedisClient` | RedisClient.`bitcount(String key, Handler<AsyncResult<Long>> handler)` Count set bits in a string
    `RedisTransaction` | RedisTransaction.`bitcount(String key, Handler<AsyncResult<String>> handler)` Count set bits in a string
    `RedisClient` | RedisClient.`bitcountRange(String key, long start, long end, Handler<AsyncResult<Long>> handler)` Count set bits in a string
    `RedisTransaction` | RedisTransaction.`bitcountRange(String key, long start, long end, Handler<AsyncResult<String>> handler)` Count set bits in a string
    `RedisClient` | RedisClient.`bitfield(String key, BitFieldOptions bitFieldOptions, Handler<AsyncResult<JsonArray>> handler)` Perform arbitrary bitfield integer operations on strings.
    `RedisClient` | RedisClient.`bitfieldWithOverflow(String key, BitFieldOptions commands, BitFieldOverflowOptions overflow, Handler<AsyncResult<JsonArray>> handler)` Perform arbitrary bitfield integer operations on strings.
    `RedisClient` | RedisClient.`bitop(BitOperation operation, String destkey, List<String> keys, Handler<AsyncResult<Long>> handler)` Perform bitwise operations between strings
    `RedisTransaction` | RedisTransaction.`bitop(BitOperation operation, String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Perform bitwise operations between strings
    `RedisClient` | RedisClient.`bitpos(String key, int bit, Handler<AsyncResult<Long>> handler)` Find first bit set or clear in a string
    `RedisTransaction` | RedisTransaction.`bitpos(String key, int bit, Handler<AsyncResult<String>> handler)` Find first bit set or clear in a string
    `RedisClient` | RedisClient.`bitposFrom(String key, int bit, int start, Handler<AsyncResult<Long>> handler)` Find first bit set or clear in a string See also bitposRange() method, which takes start, and stop offset.
    `RedisTransaction` | RedisTransaction.`bitposFrom(String key, int bit, int start, Handler<AsyncResult<String>> handler)` Find first bit set or clear in a string
    `RedisClient` | RedisClient.`bitposRange(String key, int bit, int start, int stop, Handler<AsyncResult<Long>> handler)` Find first bit set or clear in a string Note: when both start, and stop offsets are specified, behaviour is slightly different than if only start is specified
    `RedisTransaction` | RedisTransaction.`bitposRange(String key, int bit, int start, int stop, Handler<AsyncResult<String>> handler)` Find first bit set or clear in a string
    `RedisClient` | RedisClient.`blpop(String key, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the first element in a list, or block until one is available
    `RedisTransaction` | RedisTransaction.`blpop(String key, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the first element in a list, or block until one is available
    `RedisClient` | RedisClient.`blpopMany(List<String> keys, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the first element in any of the lists, or block until one is available
    `RedisTransaction` | RedisTransaction.`blpopMany(List<String> keys, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the first element in any of the lists, or block until one is available
    `RedisClient` | RedisClient.`brpop(String key, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the last element in a list, or block until one is available
    `RedisTransaction` | RedisTransaction.`brpop(String key, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the last element in a list, or block until one is available
    `RedisClient` | RedisClient.`brpoplpush(String key, String destkey, int seconds, Handler<AsyncResult<String>> handler)` Pop a value from a list, push it to another list and return it; or block until one is available
    `RedisTransaction` | RedisTransaction.`brpoplpush(String key, String destkey, int seconds, Handler<AsyncResult<String>> handler)` Pop a value from a list, push it to another list and return it; or block until one is available
    `RedisClient` | RedisClient.`brpopMany(List<String> keys, int seconds, Handler<AsyncResult<JsonArray>> handler)` Remove and get the last element in any of the lists, or block until one is available
    `RedisTransaction` | RedisTransaction.`brpopMany(List<String> keys, int seconds, Handler<AsyncResult<String>> handler)` Remove and get the last element in any of the lists, or block until one is available
    `RedisClient` | RedisClient.`clientGetname(Handler<AsyncResult<String>> handler)` Get the current connection name
    `RedisTransaction` | RedisTransaction.`clientGetname(Handler<AsyncResult<String>> handler)` Get the current connection name
    `RedisClient` | RedisClient.`clientKill(KillFilter filter, Handler<AsyncResult<Long>> handler)` Kill the connection of a client
    `RedisTransaction` | RedisTransaction.`clientKill(KillFilter filter, Handler<AsyncResult<String>> handler)` Kill the connection of a client
    `RedisClient` | RedisClient.`clientList(Handler<AsyncResult<String>> handler)` Get the list of client connections
    `RedisTransaction` | RedisTransaction.`clientList(Handler<AsyncResult<String>> handler)` Get the list of client connections
    `RedisClient` | RedisClient.`clientPause(long millis, Handler<AsyncResult<String>> handler)` Stop processing commands from clients for some time
    `RedisTransaction` | RedisTransaction.`clientPause(long millis, Handler<AsyncResult<String>> handler)` Stop processing commands from clients for some time
    `RedisClient` | RedisClient.`clientReply(ClientReplyOptions options, Handler<AsyncResult<String>> handler)` Instruct the server whether to reply to commands.
    `RedisClient` | RedisClient.`clientSetname(String name, Handler<AsyncResult<String>> handler)` Set the current connection name
    `RedisTransaction` | RedisTransaction.`clientSetname(String name, Handler<AsyncResult<String>> handler)` Set the current connection name
    `void` | RedisClient.`close(Handler<AsyncResult<Void>> handler)` Close the client - when it is fully closed the handler will be called.
    `void` | RedisTransaction.`close(Handler<AsyncResult<Void>> handler)` Close the client - when it is fully closed the handler will be called.
    `RedisClient` | RedisClient.`clusterAddslots(List<Long> slots, Handler<AsyncResult<Void>> handler)` Assign new hash slots to receiving node.
    `RedisTransaction` | RedisTransaction.`clusterAddslots(List<String> slots, Handler<AsyncResult<String>> handler)` Assign new hash slots to receiving node.
    `RedisClient` | RedisClient.`clusterCountFailureReports(String nodeId, Handler<AsyncResult<Long>> handler)` Return the number of failure reports active for a given node.
    `RedisTransaction` | RedisTransaction.`clusterCountFailureReports(String nodeId, Handler<AsyncResult<String>> handler)` Return the number of failure reports active for a given node.
    `RedisClient` | RedisClient.`clusterCountkeysinslot(long slot, Handler<AsyncResult<Long>> handler)` Return the number of local keys in the specified hash slot.
    `RedisTransaction` | RedisTransaction.`clusterCountkeysinslot(long slot, Handler<AsyncResult<String>> handler)` Return the number of local keys in the specified hash slot.
    `RedisTransaction` | RedisTransaction.`clusterDelslots(long slot, Handler<AsyncResult<String>> handler)` Set hash slots as unbound in receiving node.
    `RedisClient` | RedisClient.`clusterDelslots(long slot, Handler<AsyncResult<Void>> handler)` Set hash slots as unbound in receiving node.
    `RedisClient` | RedisClient.`clusterDelslotsMany(List<Long> slots, Handler<AsyncResult<Void>> handler)` Set hash slots as unbound in receiving node.
    `RedisTransaction` | RedisTransaction.`clusterDelslotsMany(List<String> slots, Handler<AsyncResult<String>> handler)` Set hash slots as unbound in receiving node.
    `RedisTransaction` | RedisTransaction.`clusterFailover(Handler<AsyncResult<String>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisClient` | RedisClient.`clusterFailover(Handler<AsyncResult<Void>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisTransaction` | RedisTransaction.`clusterFailOverWithOptions(FailoverOptions options, Handler<AsyncResult<String>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisClient` | RedisClient.`clusterFailOverWithOptions(FailoverOptions options, Handler<AsyncResult<Void>> handler)` Forces a slave to perform a manual failover of its master.
    `RedisTransaction` | RedisTransaction.`clusterForget(String nodeId, Handler<AsyncResult<String>> handler)` Remove a node from the nodes table.
    `RedisClient` | RedisClient.`clusterForget(String nodeId, Handler<AsyncResult<Void>> handler)` Remove a node from the nodes table.
    `RedisClient` | RedisClient.`clusterGetkeysinslot(long slot, long count, Handler<AsyncResult<JsonArray>> handler)` Return local key names in the specified hash slot.
    `RedisTransaction` | RedisTransaction.`clusterGetkeysinslot(long slot, long count, Handler<AsyncResult<String>> handler)` Return local key names in the specified hash slot.
    `RedisClient` | RedisClient.`clusterInfo(Handler<AsyncResult<JsonArray>> handler)` Provides info about Redis Cluster node state.
    `RedisTransaction` | RedisTransaction.`clusterInfo(Handler<AsyncResult<String>> handler)` Provides info about Redis Cluster node state.
    `RedisClient` | RedisClient.`clusterKeyslot(String key, Handler<AsyncResult<Long>> handler)` Returns the hash slot of the specified key.
    `RedisTransaction` | RedisTransaction.`clusterKeyslot(String key, Handler<AsyncResult<String>> handler)` Returns the hash slot of the specified key.
    `RedisTransaction` | RedisTransaction.`clusterMeet(String ip, long port, Handler<AsyncResult<String>> handler)` Force a node cluster to handshake with another node.
    `RedisClient` | RedisClient.`clusterMeet(String ip, long port, Handler<AsyncResult<Void>> handler)` Force a node cluster to handshake with another node.
    `RedisClient` | RedisClient.`clusterNodes(Handler<AsyncResult<JsonArray>> handler)` Get Cluster config for the node.
    `RedisTransaction` | RedisTransaction.`clusterNodes(Handler<AsyncResult<String>> handler)` Get Cluster config for the node.
    `RedisTransaction` | RedisTransaction.`clusterReplicate(String nodeId, Handler<AsyncResult<String>> handler)` Reconfigure a node as a slave of the specified master node.
    `RedisClient` | RedisClient.`clusterReplicate(String nodeId, Handler<AsyncResult<Void>> handler)` Reconfigure a node as a slave of the specified master node.
    `RedisTransaction` | RedisTransaction.`clusterReset(Handler<AsyncResult<String>> handler)` Reset a Redis Cluster node.
    `RedisClient` | RedisClient.`clusterReset(Handler<AsyncResult<Void>> handler)` Reset a Redis Cluster node.
    `RedisTransaction` | RedisTransaction.`clusterResetWithOptions(ResetOptions options, Handler<AsyncResult<String>> handler)` Reset a Redis Cluster node.
    `RedisClient` | RedisClient.`clusterResetWithOptions(ResetOptions options, Handler<AsyncResult<Void>> handler)` Reset a Redis Cluster node.
    `RedisTransaction` | RedisTransaction.`clusterSaveconfig(Handler<AsyncResult<String>> handler)` Forces the node to save cluster state on disk.
    `RedisClient` | RedisClient.`clusterSaveconfig(Handler<AsyncResult<Void>> handler)` Forces the node to save cluster state on disk.
    `RedisTransaction` | RedisTransaction.`clusterSetConfigEpoch(long epoch, Handler<AsyncResult<String>> handler)` Set the configuration epoch in a new node.
    `RedisClient` | RedisClient.`clusterSetConfigEpoch(long epoch, Handler<AsyncResult<Void>> handler)` Set the configuration epoch in a new node.
    `RedisTransaction` | RedisTransaction.`clusterSetslot(long slot, SlotCmd subcommand, Handler<AsyncResult<String>> handler)` Bind an hash slot to a specific node.
    `RedisClient` | RedisClient.`clusterSetslot(long slot, SlotCmd subcommand, Handler<AsyncResult<Void>> handler)` Bind an hash slot to a specific node.
    `RedisTransaction` | RedisTransaction.`clusterSetslotWithNode(long slot, SlotCmd subcommand, String nodeId, Handler<AsyncResult<String>> handler)` Bind an hash slot to a specific node.
    `RedisClient` | RedisClient.`clusterSetslotWithNode(long slot, SlotCmd subcommand, String nodeId, Handler<AsyncResult<Void>> handler)` Bind an hash slot to a specific node.
    `RedisClient` | RedisClient.`clusterSlaves(String nodeId, Handler<AsyncResult<JsonArray>> handler)` List slave nodes of the specified master node.
    `RedisTransaction` | RedisTransaction.`clusterSlaves(String nodeId, Handler<AsyncResult<String>> handler)` List slave nodes of the specified master node.
    `RedisClient` | RedisClient.`clusterSlots(Handler<AsyncResult<JsonArray>> handler)` Get array of Cluster slot to node mappings
    `RedisTransaction` | RedisTransaction.`clusterSlots(Handler<AsyncResult<String>> handler)` Get array of Cluster slot to node mappings
    `RedisClient` | RedisClient.`command(Handler<AsyncResult<JsonArray>> handler)` Get array of Redis command details
    `RedisTransaction` | RedisTransaction.`command(Handler<AsyncResult<String>> handler)` Get array of Redis command details
    `RedisClient` | RedisClient.`commandCount(Handler<AsyncResult<Long>> handler)` Get total number of Redis commands
    `RedisTransaction` | RedisTransaction.`commandCount(Handler<AsyncResult<String>> handler)` Get total number of Redis commands
    `RedisClient` | RedisClient.`commandGetkeys(Handler<AsyncResult<JsonArray>> handler)` Extract keys given a full Redis command
    `RedisTransaction` | RedisTransaction.`commandGetkeys(Handler<AsyncResult<String>> handler)` Extract keys given a full Redis command
    `RedisClient` | RedisClient.`commandInfo(List<String> commands, Handler<AsyncResult<JsonArray>> handler)` Get array of specific Redis command details
    `RedisTransaction` | RedisTransaction.`commandInfo(List<String> commands, Handler<AsyncResult<String>> handler)` Get array of specific Redis command details
    `RedisClient` | RedisClient.`configGet(String parameter, Handler<AsyncResult<JsonArray>> handler)` Get the value of a configuration parameter
    `RedisTransaction` | RedisTransaction.`configGet(String parameter, Handler<AsyncResult<String>> handler)` Get the value of a configuration parameter
    `RedisClient` | RedisClient.`configResetstat(Handler<AsyncResult<String>> handler)` Reset the stats returned by INFO
    `RedisTransaction` | RedisTransaction.`configResetstat(Handler<AsyncResult<String>> handler)` Reset the stats returned by INFO
    `RedisClient` | RedisClient.`configRewrite(Handler<AsyncResult<String>> handler)` Rewrite the configuration file with the in memory configuration
    `RedisTransaction` | RedisTransaction.`configRewrite(Handler<AsyncResult<String>> handler)` Rewrite the configuration file with the in memory configuration
    `RedisClient` | RedisClient.`configSet(String parameter, String value, Handler<AsyncResult<String>> handler)` Set a configuration parameter to the given value
    `RedisTransaction` | RedisTransaction.`configSet(String parameter, String value, Handler<AsyncResult<String>> handler)` Set a configuration parameter to the given value
    `RedisClient` | RedisClient.`dbsize(Handler<AsyncResult<Long>> handler)` Return the number of keys in the selected database
    `RedisTransaction` | RedisTransaction.`dbsize(Handler<AsyncResult<String>> handler)` Return the number of keys in the selected database
    `RedisClient` | RedisClient.`debugObject(String key, Handler<AsyncResult<String>> handler)` Get debugging information about a key
    `RedisTransaction` | RedisTransaction.`debugObject(String key, Handler<AsyncResult<String>> handler)` Get debugging information about a key
    `RedisClient` | RedisClient.`debugSegfault(Handler<AsyncResult<String>> handler)` Make the server crash
    `RedisTransaction` | RedisTransaction.`debugSegfault(Handler<AsyncResult<String>> handler)` Make the server crash
    `RedisClient` | RedisClient.`decr(String key, Handler<AsyncResult<Long>> handler)` Decrement the integer value of a key by one
    `RedisTransaction` | RedisTransaction.`decr(String key, Handler<AsyncResult<String>> handler)` Decrement the integer value of a key by one
    `RedisClient` | RedisClient.`decrby(String key, long decrement, Handler<AsyncResult<Long>> handler)` Decrement the integer value of a key by the given number
    `RedisTransaction` | RedisTransaction.`decrby(String key, long decrement, Handler<AsyncResult<String>> handler)` Decrement the integer value of a key by the given number
    `RedisClient` | RedisClient.`del(String key, Handler<AsyncResult<Long>> handler)` Delete a key
    `RedisTransaction` | RedisTransaction.`del(String key, Handler<AsyncResult<String>> handler)` Delete a key
    `RedisClient` | RedisClient.`delMany(List<String> keys, Handler<AsyncResult<Long>> handler)` Delete many keys
    `RedisTransaction` | RedisTransaction.`delMany(List<String> keys, Handler<AsyncResult<String>> handler)` Delete many keys
    `RedisTransaction` | RedisTransaction.`discard(Handler<AsyncResult<String>> handler)` Discard all commands issued after MULTI
    `RedisClient` | RedisClient.`dump(String key, Handler<AsyncResult<String>> handler)` Return a serialized version of the value stored at the specified key.
    `RedisTransaction` | RedisTransaction.`dump(String key, Handler<AsyncResult<String>> handler)` Return a serialized version of the value stored at the specified key.
    `RedisClient` | RedisClient.`echo(String message, Handler<AsyncResult<String>> handler)` Echo the given string
    `RedisTransaction` | RedisTransaction.`echo(String message, Handler<AsyncResult<String>> handler)` Echo the given string
    `RedisClient` | RedisClient.`eval(String script, List<String> keys, List<String> args, Handler<AsyncResult<JsonArray>> handler)` Execute a Lua script server side.
    `RedisTransaction` | RedisTransaction.`eval(String script, List<String> keys, List<String> args, Handler<AsyncResult<String>> handler)` Execute a Lua script server side.
    `RedisClient` | RedisClient.`evalsha(String sha1, List<String> keys, List<String> values, Handler<AsyncResult<JsonArray>> handler)` Execute a Lua script server side.
    `RedisTransaction` | RedisTransaction.`evalsha(String sha1, List<String> keys, List<String> values, Handler<AsyncResult<String>> handler)` Execute a Lua script server side.
    `RedisTransaction` | RedisTransaction.`exec(Handler<AsyncResult<JsonArray>> handler)` Execute all commands issued after MULTI
    `RedisClient` | RedisClient.`exists(String key, Handler<AsyncResult<Long>> handler)` Determine if a key exists
    `RedisTransaction` | RedisTransaction.`exists(String key, Handler<AsyncResult<String>> handler)` Determine if a key exists
    `RedisTransaction` | RedisTransaction.`expire(String key, int seconds, Handler<AsyncResult<String>> handler)` Set a key's time to live in seconds
    `RedisClient` | RedisClient.`expire(String key, long seconds, Handler<AsyncResult<Long>> handler)` Set a key's time to live in seconds
    `RedisClient` | RedisClient.`expireat(String key, long seconds, Handler<AsyncResult<Long>> handler)` Set the expiration for a key as a UNIX timestamp
    `RedisTransaction` | RedisTransaction.`expireat(String key, long seconds, Handler<AsyncResult<String>> handler)` Set the expiration for a key as a UNIX timestamp
    `RedisClient` | RedisClient.`flushall(Handler<AsyncResult<String>> handler)` Remove all keys from all databases
    `RedisTransaction` | RedisTransaction.`flushall(Handler<AsyncResult<String>> handler)` Remove all keys from all databases
    `RedisClient` | RedisClient.`flushdb(Handler<AsyncResult<String>> handler)` Remove all keys from the current database
    `RedisTransaction` | RedisTransaction.`flushdb(Handler<AsyncResult<String>> handler)` Remove all keys from the current database
    `RedisClient` | RedisClient.`geoadd(String key, double longitude, double latitude, String member, Handler<AsyncResult<Long>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisTransaction` | RedisTransaction.`geoadd(String key, double longitude, double latitude, String member, Handler<AsyncResult<String>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisClient` | RedisClient.`geoaddMany(String key, List<GeoMember> members, Handler<AsyncResult<Long>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisTransaction` | RedisTransaction.`geoaddMany(String key, List<GeoMember> members, Handler<AsyncResult<String>> handler)` Add one or more geospatial items in the geospatial index represented using a sorted set.
    `RedisClient` | RedisClient.`geodist(String key, String member1, String member2, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`geodist(String key, String member1, String member2, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`geodistWithUnit(String key, String member1, String member2, GeoUnit unit, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`geodistWithUnit(String key, String member1, String member2, GeoUnit unit, Handler<AsyncResult<String>> handler)` Return the distance between two members in the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`geohash(String key, String member, Handler<AsyncResult<JsonArray>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisTransaction` | RedisTransaction.`geohash(String key, String member, Handler<AsyncResult<String>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisClient` | RedisClient.`geohashMany(String key, List<String> members, Handler<AsyncResult<JsonArray>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisTransaction` | RedisTransaction.`geohashMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Return valid Geohash strings representing the position of one or more elements in a sorted set value representing a geospatial index (where elements were added using GEOADD).
    `RedisClient` | RedisClient.`geopos(String key, String member, Handler<AsyncResult<JsonArray>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisTransaction` | RedisTransaction.`geopos(String key, String member, Handler<AsyncResult<String>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisClient` | RedisClient.`geoposMany(String key, List<String> members, Handler<AsyncResult<JsonArray>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisTransaction` | RedisTransaction.`geoposMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Return the positions (longitude,latitude) of all the specified members of the geospatial index represented by the sorted set at key.
    `RedisClient` | RedisClient.`georadius(String key, double longitude, double latitude, double radius, GeoUnit unit, Handler<AsyncResult<JsonArray>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisTransaction` | RedisTransaction.`georadius(String key, double longitude, double latitude, double radius, GeoUnit unit, Handler<AsyncResult<String>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisClient` | RedisClient.`georadiusbymember(String key, String member, double radius, GeoUnit unit, Handler<AsyncResult<JsonArray>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`georadiusbymember(String key, String member, double radius, GeoUnit unit, Handler<AsyncResult<String>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`georadiusbymemberWithOptions(String key, String member, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<JsonArray>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisTransaction` | RedisTransaction.`georadiusbymemberWithOptions(String key, String member, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<String>> handler)` This command is exactly like GEORADIUS with the sole difference that instead of taking, as the center of the area to query, a longitude and latitude value, it takes the name of a member already existing inside the geospatial index represented by the sorted set.
    `RedisClient` | RedisClient.`georadiusWithOptions(String key, double longitude, double latitude, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<JsonArray>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisTransaction` | RedisTransaction.`georadiusWithOptions(String key, double longitude, double latitude, double radius, GeoUnit unit, GeoRadiusOptions options, Handler<AsyncResult<String>> handler)` Return the members of a sorted set populated with geospatial information using GEOADD, which are within the borders of the area specified with the center location and the maximum distance from the center (the radius).
    `RedisClient` | RedisClient.`get(String key, Handler<AsyncResult<String>> handler)` Get the value of a key
    `RedisTransaction` | RedisTransaction.`get(String key, Handler<AsyncResult<String>> handler)` Get the value of a key
    `RedisClient` | RedisClient.`getBinary(String key, Handler<AsyncResult<Buffer>> handler)` Get the value of a key - without decoding as utf-8
    `RedisTransaction` | RedisTransaction.`getBinary(String key, Handler<AsyncResult<String>> handler)` Get the value of a key - without decoding as utf-8
    `RedisClient` | RedisClient.`getbit(String key, long offset, Handler<AsyncResult<Long>> handler)` Returns the bit value at offset in the string value stored at key
    `RedisTransaction` | RedisTransaction.`getbit(String key, long offset, Handler<AsyncResult<String>> handler)` Returns the bit value at offset in the string value stored at key
    `RedisClient` | RedisClient.`getrange(String key, long start, long end, Handler<AsyncResult<String>> handler)` Get a substring of the string stored at a key
    `RedisTransaction` | RedisTransaction.`getrange(String key, long start, long end, Handler<AsyncResult<String>> handler)` Get a substring of the string stored at a key
    `RedisClient` | RedisClient.`getset(String key, String value, Handler<AsyncResult<String>> handler)` Set the string value of a key and return its old value
    `RedisTransaction` | RedisTransaction.`getset(String key, String value, Handler<AsyncResult<String>> handler)` Set the string value of a key and return its old value
    `RedisClient` | RedisClient.`hdel(String key, String field, Handler<AsyncResult<Long>> handler)` Delete one or more hash fields
    `RedisTransaction` | RedisTransaction.`hdel(String key, String field, Handler<AsyncResult<String>> handler)` Delete one or more hash fields
    `RedisClient` | RedisClient.`hdelMany(String key, List<String> fields, Handler<AsyncResult<Long>> handler)` Delete one or more hash fields
    `RedisTransaction` | RedisTransaction.`hdelMany(String key, List<String> fields, Handler<AsyncResult<String>> handler)` Delete one or more hash fields
    `RedisClient` | RedisClient.`hexists(String key, String field, Handler<AsyncResult<Long>> handler)` Determine if a hash field exists
    `RedisTransaction` | RedisTransaction.`hexists(String key, String field, Handler<AsyncResult<String>> handler)` Determine if a hash field exists
    `RedisClient` | RedisClient.`hget(String key, String field, Handler<AsyncResult<String>> handler)` Get the value of a hash field
    `RedisTransaction` | RedisTransaction.`hget(String key, String field, Handler<AsyncResult<String>> handler)` Get the value of a hash field
    `RedisClient` | RedisClient.`hgetall(String key, Handler<AsyncResult<JsonObject>> handler)` Get all the fields and values in a hash
    `RedisTransaction` | RedisTransaction.`hgetall(String key, Handler<AsyncResult<String>> handler)` Get all the fields and values in a hash
    `RedisClient` | RedisClient.`hincrby(String key, String field, long increment, Handler<AsyncResult<Long>> handler)` Increment the integer value of a hash field by the given number
    `RedisTransaction` | RedisTransaction.`hincrby(String key, String field, long increment, Handler<AsyncResult<String>> handler)` Increment the integer value of a hash field by the given number
    `RedisClient` | RedisClient.`hincrbyfloat(String key, String field, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a hash field by the given amount
    `RedisTransaction` | RedisTransaction.`hincrbyfloat(String key, String field, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a hash field by the given amount
    `RedisClient` | RedisClient.`hkeys(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the fields in a hash
    `RedisTransaction` | RedisTransaction.`hkeys(String key, Handler<AsyncResult<String>> handler)` Get all the fields in a hash
    `RedisClient` | RedisClient.`hlen(String key, Handler<AsyncResult<Long>> handler)` Get the number of fields in a hash
    `RedisTransaction` | RedisTransaction.`hlen(String key, Handler<AsyncResult<String>> handler)` Get the number of fields in a hash
    `RedisClient` | RedisClient.`hmget(String key, List<String> fields, Handler<AsyncResult<JsonArray>> handler)` Get the values of all the given hash fields
    `RedisTransaction` | RedisTransaction.`hmget(String key, List<String> fields, Handler<AsyncResult<String>> handler)` Get the values of all the given hash fields
    `RedisClient` | RedisClient.`hmset(String key, JsonObject values, Handler<AsyncResult<String>> handler)` Set multiple hash fields to multiple values
    `RedisTransaction` | RedisTransaction.`hmset(String key, JsonObject values, Handler<AsyncResult<String>> handler)` Set multiple hash fields to multiple values
    `RedisClient` | RedisClient.`hscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate hash fields and associated values
    `RedisTransaction` | RedisTransaction.`hscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate hash fields and associated values
    `RedisClient` | RedisClient.`hset(String key, String field, String value, Handler<AsyncResult<Long>> handler)` Set the string value of a hash field
    `RedisTransaction` | RedisTransaction.`hset(String key, String field, String value, Handler<AsyncResult<String>> handler)` Set the string value of a hash field
    `RedisClient` | RedisClient.`hsetnx(String key, String field, String value, Handler<AsyncResult<Long>> handler)` Set the value of a hash field, only if the field does not exist
    `RedisTransaction` | RedisTransaction.`hsetnx(String key, String field, String value, Handler<AsyncResult<String>> handler)` Set the value of a hash field, only if the field does not exist
    `RedisClient` | RedisClient.`hstrlen(String key, String field, Handler<AsyncResult<Long>> handler)` Get the length of the value of a hash field.
    `RedisClient` | RedisClient.`hvals(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the values in a hash
    `RedisTransaction` | RedisTransaction.`hvals(String key, Handler<AsyncResult<String>> handler)` Get all the values in a hash
    `RedisClient` | RedisClient.`incr(String key, Handler<AsyncResult<Long>> handler)` Increment the integer value of a key by one
    `RedisTransaction` | RedisTransaction.`incr(String key, Handler<AsyncResult<String>> handler)` Increment the integer value of a key by one
    `RedisClient` | RedisClient.`incrby(String key, long increment, Handler<AsyncResult<Long>> handler)` Increment the integer value of a key by the given amount
    `RedisTransaction` | RedisTransaction.`incrby(String key, long increment, Handler<AsyncResult<String>> handler)` Increment the integer value of a key by the given amount
    `RedisClient` | RedisClient.`incrbyfloat(String key, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a key by the given amount
    `RedisTransaction` | RedisTransaction.`incrbyfloat(String key, double increment, Handler<AsyncResult<String>> handler)` Increment the float value of a key by the given amount
    `RedisClient` | RedisClient.`info(Handler<AsyncResult<JsonObject>> handler)` Get information and statistics about the server
    `RedisTransaction` | RedisTransaction.`info(Handler<AsyncResult<String>> handler)` Get information and statistics about the server
    `RedisClient` | RedisClient.`infoSection(String section, Handler<AsyncResult<JsonObject>> handler)` Get information and statistics about the server
    `RedisTransaction` | RedisTransaction.`infoSection(String section, Handler<AsyncResult<String>> handler)` Get information and statistics about the server
    `RedisClient` | RedisClient.`keys(String pattern, Handler<AsyncResult<JsonArray>> handler)` Find all keys matching the given pattern
    `RedisTransaction` | RedisTransaction.`keys(String pattern, Handler<AsyncResult<String>> handler)` Find all keys matching the given pattern
    `RedisClient` | RedisClient.`lastsave(Handler<AsyncResult<Long>> handler)` Get the UNIX time stamp of the last successful save to disk
    `RedisTransaction` | RedisTransaction.`lastsave(Handler<AsyncResult<String>> handler)` Get the UNIX time stamp of the last successful save to disk
    `RedisClient` | RedisClient.`lindex(String key, int index, Handler<AsyncResult<String>> handler)` Get an element from a list by its index
    `RedisTransaction` | RedisTransaction.`lindex(String key, int index, Handler<AsyncResult<String>> handler)` Get an element from a list by its index
    `RedisClient` | RedisClient.`linsert(String key, InsertOptions option, String pivot, String value, Handler<AsyncResult<Long>> handler)` Insert an element before or after another element in a list
    `RedisTransaction` | RedisTransaction.`linsert(String key, InsertOptions option, String pivot, String value, Handler<AsyncResult<String>> handler)` Insert an element before or after another element in a list
    `RedisClient` | RedisClient.`llen(String key, Handler<AsyncResult<Long>> handler)` Get the length of a list
    `RedisTransaction` | RedisTransaction.`llen(String key, Handler<AsyncResult<String>> handler)` Get the length of a list
    `RedisClient` | RedisClient.`lpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the first element in a list
    `RedisTransaction` | RedisTransaction.`lpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the first element in a list
    `RedisClient` | RedisClient.`lpush(String key, String value, Handler<AsyncResult<Long>> handler)` Prepend one value to a list
    `RedisTransaction` | RedisTransaction.`lpush(String key, String value, Handler<AsyncResult<String>> handler)` Prepend one value to a list
    `RedisClient` | RedisClient.`lpushMany(String key, List<String> values, Handler<AsyncResult<Long>> handler)` Prepend one or multiple values to a list
    `RedisTransaction` | RedisTransaction.`lpushMany(String key, List<String> values, Handler<AsyncResult<String>> handler)` Prepend one or multiple values to a list
    `RedisClient` | RedisClient.`lpushx(String key, String value, Handler<AsyncResult<Long>> handler)` Prepend a value to a list, only if the list exists
    `RedisTransaction` | RedisTransaction.`lpushx(String key, String value, Handler<AsyncResult<String>> handler)` Prepend a value to a list, only if the list exists
    `RedisClient` | RedisClient.`lrange(String key, long from, long to, Handler<AsyncResult<JsonArray>> handler)` Get a range of elements from a list
    `RedisTransaction` | RedisTransaction.`lrange(String key, long from, long to, Handler<AsyncResult<String>> handler)` Get a range of elements from a list
    `RedisClient` | RedisClient.`lrem(String key, long count, String value, Handler<AsyncResult<Long>> handler)` Remove elements from a list
    `RedisTransaction` | RedisTransaction.`lrem(String key, long count, String value, Handler<AsyncResult<String>> handler)` Remove elements from a list
    `RedisClient` | RedisClient.`lset(String key, long index, String value, Handler<AsyncResult<String>> handler)` Set the value of an element in a list by its index
    `RedisTransaction` | RedisTransaction.`lset(String key, long index, String value, Handler<AsyncResult<String>> handler)` Set the value of an element in a list by its index
    `RedisClient` | RedisClient.`ltrim(String key, long from, long to, Handler<AsyncResult<String>> handler)` Trim a list to the specified range
    `RedisTransaction` | RedisTransaction.`ltrim(String key, long from, long to, Handler<AsyncResult<String>> handler)` Trim a list to the specified range
    `RedisClient` | RedisClient.`mget(String key, Handler<AsyncResult<JsonArray>> handler)` Get the value of the given key
    `RedisTransaction` | RedisTransaction.`mget(String key, Handler<AsyncResult<String>> handler)` Get the value of the given key
    `RedisClient` | RedisClient.`mgetMany(List<String> keys, Handler<AsyncResult<JsonArray>> handler)` Get the values of all the given keys
    `RedisTransaction` | RedisTransaction.`mgetMany(List<String> keys, Handler<AsyncResult<String>> handler)` Get the values of all the given keys
    `RedisClient` | RedisClient.`migrate(String host, int port, String key, int destdb, long timeout, MigrateOptions options, Handler<AsyncResult<String>> handler)` Atomically transfer a key from a Redis instance to another one.
    `RedisTransaction` | RedisTransaction.`migrate(String host, int port, String key, int destdb, long timeout, MigrateOptions options, Handler<AsyncResult<String>> handler)` Atomically transfer a key from a Redis instance to another one.
    `RedisTransaction` | RedisTransaction.`monitor(Handler<AsyncResult<String>> handler)` Listen for all requests received by the server in real time
    `RedisClient` | RedisClient.`monitor(Handler<AsyncResult<Void>> handler)` Listen for all requests received by the server in real time
    `RedisClient` | RedisClient.`move(String key, int destdb, Handler<AsyncResult<Long>> handler)` Move a key to another database
    `RedisTransaction` | RedisTransaction.`move(String key, int destdb, Handler<AsyncResult<String>> handler)` Move a key to another database
    `RedisClient` | RedisClient.`mset(JsonObject keyvals, Handler<AsyncResult<String>> handler)` Set multiple keys to multiple values
    `RedisTransaction` | RedisTransaction.`mset(JsonObject keyvals, Handler<AsyncResult<String>> handler)` Set multiple keys to multiple values
    `RedisClient` | RedisClient.`msetnx(JsonObject keyvals, Handler<AsyncResult<Long>> handler)` Set multiple keys to multiple values, only if none of the keys exist
    `RedisTransaction` | RedisTransaction.`msetnx(JsonObject keyvals, Handler<AsyncResult<String>> handler)` Set multiple keys to multiple values, only if none of the keys exist
    `RedisTransaction` | RedisTransaction.`multi(Handler<AsyncResult<String>> handler)` Mark the start of a RedisTransaction block
    `RedisTransaction` | RedisTransaction.`object(String key, ObjectCmd cmd, Handler<AsyncResult<String>> handler)` Inspect the internals of Redis objects
    `RedisClient` | RedisClient.`object(String key, ObjectCmd cmd, Handler<AsyncResult<Void>> handler)` Inspect the internals of Redis objects
    `RedisClient` | RedisClient.`persist(String key, Handler<AsyncResult<Long>> handler)` Remove the expiration from a key
    `RedisTransaction` | RedisTransaction.`persist(String key, Handler<AsyncResult<String>> handler)` Remove the expiration from a key
    `RedisClient` | RedisClient.`pexpire(String key, long millis, Handler<AsyncResult<Long>> handler)` Set a key's time to live in milliseconds
    `RedisTransaction` | RedisTransaction.`pexpire(String key, long millis, Handler<AsyncResult<String>> handler)` Set a key's time to live in milliseconds
    `RedisClient` | RedisClient.`pexpireat(String key, long millis, Handler<AsyncResult<Long>> handler)` Set the expiration for a key as a UNIX timestamp specified in milliseconds
    `RedisTransaction` | RedisTransaction.`pexpireat(String key, long millis, Handler<AsyncResult<String>> handler)` Set the expiration for a key as a UNIX timestamp specified in milliseconds
    `RedisClient` | RedisClient.`pfadd(String key, String element, Handler<AsyncResult<Long>> handler)` Adds the specified element to the specified HyperLogLog.
    `RedisTransaction` | RedisTransaction.`pfadd(String key, String element, Handler<AsyncResult<String>> handler)` Adds the specified element to the specified HyperLogLog.
    `RedisClient` | RedisClient.`pfaddMany(String key, List<String> elements, Handler<AsyncResult<Long>> handler)` Adds the specified elements to the specified HyperLogLog.
    `RedisTransaction` | RedisTransaction.`pfaddMany(String key, List<String> elements, Handler<AsyncResult<String>> handler)` Adds the specified elements to the specified HyperLogLog.
    `RedisClient` | RedisClient.`pfcount(String key, Handler<AsyncResult<Long>> handler)` Return the approximated cardinality of the set observed by the HyperLogLog at key.
    `RedisTransaction` | RedisTransaction.`pfcount(String key, Handler<AsyncResult<String>> handler)` Return the approximated cardinality of the set observed by the HyperLogLog at key.
    `RedisClient` | RedisClient.`pfcountMany(List<String> keys, Handler<AsyncResult<Long>> handler)` Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
    `RedisTransaction` | RedisTransaction.`pfcountMany(List<String> keys, Handler<AsyncResult<String>> handler)` Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
    `RedisClient` | RedisClient.`pfmerge(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Merge N different HyperLogLogs into a single one.
    `RedisTransaction` | RedisTransaction.`pfmerge(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Merge N different HyperLogLogs into a single one.
    `RedisClient` | RedisClient.`ping(Handler<AsyncResult<String>> handler)` Ping the server
    `RedisTransaction` | RedisTransaction.`ping(Handler<AsyncResult<String>> handler)` Ping the server
    `RedisTransaction` | RedisTransaction.`psetex(String key, long millis, String value, Handler<AsyncResult<String>> handler)` Set the value and expiration in milliseconds of a key
    `RedisClient` | RedisClient.`psetex(String key, long millis, String value, Handler<AsyncResult<Void>> handler)` Set the value and expiration in milliseconds of a key
    `RedisClient` | RedisClient.`psubscribe(String pattern, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to channels matching the given pattern
    `RedisTransaction` | RedisTransaction.`psubscribe(String pattern, Handler<AsyncResult<String>> handler)` Listen for messages published to channels matching the given pattern
    `RedisClient` | RedisClient.`psubscribeMany(List<String> patterns, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to channels matching the given patterns
    `RedisTransaction` | RedisTransaction.`psubscribeMany(List<String> patterns, Handler<AsyncResult<String>> handler)` Listen for messages published to channels matching the given patterns
    `RedisClient` | RedisClient.`pttl(String key, Handler<AsyncResult<Long>> handler)` Get the time to live for a key in milliseconds
    `RedisTransaction` | RedisTransaction.`pttl(String key, Handler<AsyncResult<String>> handler)` Get the time to live for a key in milliseconds
    `RedisClient` | RedisClient.`publish(String channel, String message, Handler<AsyncResult<Long>> handler)` Post a message to a channel
    `RedisTransaction` | RedisTransaction.`publish(String channel, String message, Handler<AsyncResult<String>> handler)` Post a message to a channel
    `RedisClient` | RedisClient.`pubsubChannels(String pattern, Handler<AsyncResult<JsonArray>> handler)` Lists the currently active channels - only those matching the pattern
    `RedisTransaction` | RedisTransaction.`pubsubChannels(String pattern, Handler<AsyncResult<String>> handler)` Lists the currently active channels - only those matching the pattern
    `RedisClient` | RedisClient.`pubsubNumpat(Handler<AsyncResult<Long>> handler)` Returns the number of subscriptions to patterns (that are performed using the PSUBSCRIBE command)
    `RedisTransaction` | RedisTransaction.`pubsubNumpat(Handler<AsyncResult<String>> handler)` Returns the number of subscriptions to patterns (that are performed using the PSUBSCRIBE command)
    `RedisClient` | RedisClient.`pubsubNumsub(List<String> channels, Handler<AsyncResult<JsonArray>> handler)` Returns the number of subscribers (not counting clients subscribed to patterns) for the specified channels
    `RedisTransaction` | RedisTransaction.`pubsubNumsub(List<String> channels, Handler<AsyncResult<String>> handler)` Returns the number of subscribers (not counting clients subscribed to patterns) for the specified channels
    `RedisTransaction` | RedisTransaction.`punsubscribe(List<String> patterns, Handler<AsyncResult<String>> handler)` Stop listening for messages posted to channels matching the given patterns
    `RedisClient` | RedisClient.`punsubscribe(List<String> patterns, Handler<AsyncResult<Void>> handler)` Stop listening for messages posted to channels matching the given patterns
    `RedisClient` | RedisClient.`randomkey(Handler<AsyncResult<String>> handler)` Return a random key from the keyspace
    `RedisTransaction` | RedisTransaction.`randomkey(Handler<AsyncResult<String>> handler)` Return a random key from the keyspace
    `RedisClient` | RedisClient.`rename(String key, String newkey, Handler<AsyncResult<String>> handler)` Rename a key
    `RedisTransaction` | RedisTransaction.`rename(String key, String newkey, Handler<AsyncResult<String>> handler)` Rename a key
    `RedisClient` | RedisClient.`renamenx(String key, String newkey, Handler<AsyncResult<Long>> handler)` Rename a key, only if the new key does not exist
    `RedisTransaction` | RedisTransaction.`renamenx(String key, String newkey, Handler<AsyncResult<String>> handler)` Rename a key, only if the new key does not exist
    `RedisClient` | RedisClient.`restore(String key, long millis, String serialized, Handler<AsyncResult<String>> handler)` Create a key using the provided serialized value, previously obtained using DUMP.
    `RedisTransaction` | RedisTransaction.`restore(String key, long millis, String serialized, Handler<AsyncResult<String>> handler)` Create a key using the provided serialized value, previously obtained using DUMP.
    `RedisClient` | RedisClient.`role(Handler<AsyncResult<JsonArray>> handler)` Return the role of the instance in the context of replication
    `RedisTransaction` | RedisTransaction.`role(Handler<AsyncResult<String>> handler)` Return the role of the instance in the context of replication
    `RedisClient` | RedisClient.`rpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the last element in a list
    `RedisTransaction` | RedisTransaction.`rpop(String key, Handler<AsyncResult<String>> handler)` Remove and get the last element in a list
    `RedisClient` | RedisClient.`rpoplpush(String key, String destkey, Handler<AsyncResult<String>> handler)` Remove the last element in a list, append it to another list and return it
    `RedisTransaction` | RedisTransaction.`rpoplpush(String key, String destkey, Handler<AsyncResult<String>> handler)` Remove the last element in a list, append it to another list and return it
    `RedisClient` | RedisClient.`rpush(String key, String value, Handler<AsyncResult<Long>> handler)` Append one or multiple values to a list
    `RedisTransaction` | RedisTransaction.`rpush(String key, String value, Handler<AsyncResult<String>> handler)` Append one or multiple values to a list
    `RedisClient` | RedisClient.`rpushMany(String key, List<String> values, Handler<AsyncResult<Long>> handler)` Append one or multiple values to a list
    `RedisTransaction` | RedisTransaction.`rpushMany(String key, List<String> values, Handler<AsyncResult<String>> handler)` Append one or multiple values to a list
    `RedisClient` | RedisClient.`rpushx(String key, String value, Handler<AsyncResult<Long>> handler)` Append a value to a list, only if the list exists
    `RedisTransaction` | RedisTransaction.`rpushx(String key, String value, Handler<AsyncResult<String>> handler)` Append a value to a list, only if the list exists
    `RedisClient` | RedisClient.`sadd(String key, String member, Handler<AsyncResult<Long>> handler)` Add a member to a set
    `RedisTransaction` | RedisTransaction.`sadd(String key, String member, Handler<AsyncResult<String>> handler)` Add a member to a set
    `RedisClient` | RedisClient.`saddMany(String key, List<String> members, Handler<AsyncResult<Long>> handler)` Add one or more members to a set
    `RedisTransaction` | RedisTransaction.`saddMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Add one or more members to a set
    `RedisClient` | RedisClient.`save(Handler<AsyncResult<String>> handler)` Synchronously save the dataset to disk
    `RedisTransaction` | RedisTransaction.`save(Handler<AsyncResult<String>> handler)` Synchronously save the dataset to disk
    `RedisClient` | RedisClient.`scan(String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate the keys space
    `RedisTransaction` | RedisTransaction.`scan(String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate the keys space
    `RedisClient` | RedisClient.`scard(String key, Handler<AsyncResult<Long>> handler)` Get the number of members in a set
    `RedisTransaction` | RedisTransaction.`scard(String key, Handler<AsyncResult<String>> handler)` Get the number of members in a set
    `RedisClient` | RedisClient.`scriptDebug(ScriptDebugOptions scriptDebugOptions, Handler<AsyncResult<String>> handler)` Set the debug mode for executed scripts.
    `RedisClient` | RedisClient.`scriptExists(String script, Handler<AsyncResult<JsonArray>> handler)` Check existence of script in the script cache.
    `RedisTransaction` | RedisTransaction.`scriptExists(String script, Handler<AsyncResult<String>> handler)` Check existence of script in the script cache.
    `RedisClient` | RedisClient.`scriptExistsMany(List<String> scripts, Handler<AsyncResult<JsonArray>> handler)` Check existence of scripts in the script cache.
    `RedisTransaction` | RedisTransaction.`scriptExistsMany(List<String> scripts, Handler<AsyncResult<String>> handler)` Check existence of scripts in the script cache.
    `RedisClient` | RedisClient.`scriptFlush(Handler<AsyncResult<String>> handler)` Remove all the scripts from the script cache.
    `RedisTransaction` | RedisTransaction.`scriptFlush(Handler<AsyncResult<String>> handler)` Remove all the scripts from the script cache.
    `RedisClient` | RedisClient.`scriptKill(Handler<AsyncResult<String>> handler)` Kill the script currently in execution.
    `RedisTransaction` | RedisTransaction.`scriptKill(Handler<AsyncResult<String>> handler)` Kill the script currently in execution.
    `RedisClient` | RedisClient.`scriptLoad(String script, Handler<AsyncResult<String>> handler)` Load the specified Lua script into the script cache.
    `RedisTransaction` | RedisTransaction.`scriptLoad(String script, Handler<AsyncResult<String>> handler)` Load the specified Lua script into the script cache.
    `RedisClient` | RedisClient.`sdiff(String key, List<String> cmpkeys, Handler<AsyncResult<JsonArray>> handler)` Subtract multiple sets
    `RedisTransaction` | RedisTransaction.`sdiff(String key, List<String> cmpkeys, Handler<AsyncResult<String>> handler)` Subtract multiple sets
    `RedisClient` | RedisClient.`sdiffstore(String destkey, String key, List<String> cmpkeys, Handler<AsyncResult<Long>> handler)` Subtract multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sdiffstore(String destkey, String key, List<String> cmpkeys, Handler<AsyncResult<String>> handler)` Subtract multiple sets and store the resulting set in a key
    `RedisClient` | RedisClient.`select(int dbindex, Handler<AsyncResult<String>> handler)` Change the selected database for the current connection
    `RedisTransaction` | RedisTransaction.`select(int dbindex, Handler<AsyncResult<String>> handler)` Change the selected database for the current connection
    `RedisTransaction` | RedisTransaction.`set(String key, String value, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`set(String key, String value, Handler<AsyncResult<Void>> handler)` Set the string value of a key
    `RedisTransaction` | RedisTransaction.`setBinary(String key, Buffer value, Handler<AsyncResult<String>> handler)` Set the binary string value of a key - without encoding as utf-8
    `RedisClient` | RedisClient.`setBinary(String key, Buffer value, Handler<AsyncResult<Void>> handler)` Set the binary string value of a key - without encoding as utf-8
    `RedisTransaction` | RedisTransaction.`setBinaryWithOptions(String key, Buffer value, SetOptions options, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`setBinaryWithOptions(String key, Buffer value, SetOptions options, Handler<AsyncResult<Void>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`setbit(String key, long offset, int bit, Handler<AsyncResult<Long>> handler)` Sets or clears the bit at offset in the string value stored at key
    `RedisTransaction` | RedisTransaction.`setbit(String key, long offset, int bit, Handler<AsyncResult<String>> handler)` Sets or clears the bit at offset in the string value stored at key
    `RedisClient` | RedisClient.`setex(String key, long seconds, String value, Handler<AsyncResult<String>> handler)` Set the value and expiration of a key
    `RedisTransaction` | RedisTransaction.`setex(String key, long seconds, String value, Handler<AsyncResult<String>> handler)` Set the value and expiration of a key
    `RedisClient` | RedisClient.`setnx(String key, String value, Handler<AsyncResult<Long>> handler)` Set the value of a key, only if the key does not exist
    `RedisTransaction` | RedisTransaction.`setnx(String key, String value, Handler<AsyncResult<String>> handler)` Set the value of a key, only if the key does not exist
    `RedisClient` | RedisClient.`setrange(String key, int offset, String value, Handler<AsyncResult<Long>> handler)` Overwrite part of a string at key starting at the specified offset
    `RedisTransaction` | RedisTransaction.`setrange(String key, int offset, String value, Handler<AsyncResult<String>> handler)` Overwrite part of a string at key starting at the specified offset
    `RedisClient` | RedisClient.`setWithOptions(String key, String value, SetOptions options, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisTransaction` | RedisTransaction.`setWithOptions(String key, String value, SetOptions options, Handler<AsyncResult<String>> handler)` Set the string value of a key
    `RedisClient` | RedisClient.`sinter(List<String> keys, Handler<AsyncResult<JsonArray>> handler)` Intersect multiple sets
    `RedisTransaction` | RedisTransaction.`sinter(List<String> keys, Handler<AsyncResult<String>> handler)` Intersect multiple sets
    `RedisClient` | RedisClient.`sinterstore(String destkey, List<String> keys, Handler<AsyncResult<Long>> handler)` Intersect multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sinterstore(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Intersect multiple sets and store the resulting set in a key
    `RedisClient` | RedisClient.`sismember(String key, String member, Handler<AsyncResult<Long>> handler)` Determine if a given value is a member of a set
    `RedisTransaction` | RedisTransaction.`sismember(String key, String member, Handler<AsyncResult<String>> handler)` Determine if a given value is a member of a set
    `RedisClient` | RedisClient.`slaveof(String host, int port, Handler<AsyncResult<String>> handler)` Make the server a slave of another instance
    `RedisTransaction` | RedisTransaction.`slaveof(String host, int port, Handler<AsyncResult<String>> handler)` Make the server a slave of another instance
    `RedisClient` | RedisClient.`slaveofNoone(Handler<AsyncResult<String>> handler)` Make this server a master
    `RedisTransaction` | RedisTransaction.`slaveofNoone(Handler<AsyncResult<String>> handler)` Make this server a master
    `RedisClient` | RedisClient.`slowlogGet(int limit, Handler<AsyncResult<JsonArray>> handler)` Read the Redis slow queries log
    `RedisTransaction` | RedisTransaction.`slowlogGet(int limit, Handler<AsyncResult<String>> handler)` Read the Redis slow queries log
    `RedisClient` | RedisClient.`slowlogLen(Handler<AsyncResult<Long>> handler)` Get the length of the Redis slow queries log
    `RedisTransaction` | RedisTransaction.`slowlogLen(Handler<AsyncResult<String>> handler)` Get the length of the Redis slow queries log
    `RedisTransaction` | RedisTransaction.`slowlogReset(Handler<AsyncResult<String>> handler)` Reset the Redis slow queries log
    `RedisClient` | RedisClient.`slowlogReset(Handler<AsyncResult<Void>> handler)` Reset the Redis slow queries log
    `RedisClient` | RedisClient.`smembers(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the members in a set
    `RedisTransaction` | RedisTransaction.`smembers(String key, Handler<AsyncResult<JsonArray>> handler)` Get all the members in a set
    `RedisClient` | RedisClient.`smove(String key, String destkey, String member, Handler<AsyncResult<Long>> handler)` Move a member from one set to another
    `RedisTransaction` | RedisTransaction.`smove(String key, String destkey, String member, Handler<AsyncResult<String>> handler)` Move a member from one set to another
    `RedisClient` | RedisClient.`sort(String key, SortOptions options, Handler<AsyncResult<JsonArray>> handler)` Sort the elements in a list, set or sorted set
    `RedisTransaction` | RedisTransaction.`sort(String key, SortOptions options, Handler<AsyncResult<String>> handler)` Sort the elements in a list, set or sorted set
    `RedisClient` | RedisClient.`spop(String key, Handler<AsyncResult<String>> handler)` Remove and return a random member from a set
    `RedisTransaction` | RedisTransaction.`spop(String key, Handler<AsyncResult<String>> handler)` Remove and return a random member from a set
    `RedisClient` | RedisClient.`spopMany(String key, int count, Handler<AsyncResult<JsonArray>> handler)` Remove and return random members from a set
    `RedisTransaction` | RedisTransaction.`spopMany(String key, int count, Handler<AsyncResult<String>> handler)` Remove and return random members from a set
    `RedisClient` | RedisClient.`srandmember(String key, Handler<AsyncResult<String>> handler)` Get one or multiple random members from a set
    `RedisTransaction` | RedisTransaction.`srandmember(String key, Handler<AsyncResult<String>> handler)` Get one or multiple random members from a set
    `RedisClient` | RedisClient.`srandmemberCount(String key, int count, Handler<AsyncResult<JsonArray>> handler)` Get one or multiple random members from a set
    `RedisTransaction` | RedisTransaction.`srandmemberCount(String key, int count, Handler<AsyncResult<String>> handler)` Get one or multiple random members from a set
    `RedisClient` | RedisClient.`srem(String key, String member, Handler<AsyncResult<Long>> handler)` Remove one member from a set
    `RedisTransaction` | RedisTransaction.`srem(String key, String member, Handler<AsyncResult<String>> handler)` Remove one member from a set
    `RedisClient` | RedisClient.`sremMany(String key, List<String> members, Handler<AsyncResult<Long>> handler)` Remove one or more members from a set
    `RedisTransaction` | RedisTransaction.`sremMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Remove one or more members from a set
    `RedisClient` | RedisClient.`sscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate Set elements
    `RedisTransaction` | RedisTransaction.`sscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate Set elements
    `RedisClient` | RedisClient.`strlen(String key, Handler<AsyncResult<Long>> handler)` Get the length of the value stored in a key
    `RedisTransaction` | RedisTransaction.`strlen(String key, Handler<AsyncResult<String>> handler)` Get the length of the value stored in a key
    `RedisClient` | RedisClient.`subscribe(String channel, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to the given channels
    `RedisTransaction` | RedisTransaction.`subscribe(String channel, Handler<AsyncResult<String>> handler)` Listen for messages published to the given channels
    `RedisClient` | RedisClient.`subscribeMany(List<String> channels, Handler<AsyncResult<JsonArray>> handler)` Listen for messages published to the given channels
    `RedisTransaction` | RedisTransaction.`subscribeMany(List<String> channels, Handler<AsyncResult<String>> handler)` Listen for messages published to the given channels
    `RedisClient` | RedisClient.`sunion(List<String> keys, Handler<AsyncResult<JsonArray>> handler)` Add multiple sets
    `RedisTransaction` | RedisTransaction.`sunion(List<String> keys, Handler<AsyncResult<String>> handler)` Add multiple sets
    `RedisClient` | RedisClient.`sunionstore(String destkey, List<String> keys, Handler<AsyncResult<Long>> handler)` Add multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sunionstore(String destkey, List<String> keys, Handler<AsyncResult<String>> handler)` Add multiple sets and store the resulting set in a key
    `RedisTransaction` | RedisTransaction.`sync(Handler<AsyncResult<String>> handler)` Internal command used for replication
    `RedisClient` | RedisClient.`sync(Handler<AsyncResult<Void>> handler)` Internal command used for replication
    `RedisClient` | RedisClient.`time(Handler<AsyncResult<JsonArray>> handler)` Return the current server time
    `RedisTransaction` | RedisTransaction.`time(Handler<AsyncResult<String>> handler)` Return the current server time
    `RedisClient` | RedisClient.`touch(String key, Handler<AsyncResult<Long>> handler)` Alters the last access time of a key(s).
    `RedisClient` | RedisClient.`touchMany(List<String> keys, Handler<AsyncResult<Long>> handler)` Alters the last access time of a key(s).
    `RedisClient` | RedisClient.`ttl(String key, Handler<AsyncResult<Long>> handler)` Get the time to live for a key
    `RedisTransaction` | RedisTransaction.`ttl(String key, Handler<AsyncResult<String>> handler)` Get the time to live for a key
    `RedisClient` | RedisClient.`type(String key, Handler<AsyncResult<String>> handler)` Determine the type stored at key
    `RedisTransaction` | RedisTransaction.`type(String key, Handler<AsyncResult<String>> handler)` Determine the type stored at key
    `RedisTransaction` | RedisTransaction.`unsubscribe(List<String> channels, Handler<AsyncResult<String>> handler)` Stop listening for messages posted to the given channels
    `RedisClient` | RedisClient.`unsubscribe(List<String> channels, Handler<AsyncResult<Void>> handler)` Stop listening for messages posted to the given channels
    `RedisTransaction` | RedisTransaction.`unwatch(Handler<AsyncResult<String>> handler)` Forget about all watched keys
    `RedisClient` | RedisClient.`wait(long numSlaves, long timeout, Handler<AsyncResult<String>> handler)` Wait for the synchronous replication of all the write commands sent in the context of the current connection.
    `RedisTransaction` | RedisTransaction.`wait(long numSlaves, long timeout, Handler<AsyncResult<String>> handler)` Wait for the synchronous replication of all the write commands sent in the context of the current connection.
    `RedisTransaction` | RedisTransaction.`watch(String key, Handler<AsyncResult<String>> handler)` Watch the given keys to determine execution of the MULTI/EXEC block
    `RedisTransaction` | RedisTransaction.`watchMany(List<String> keys, Handler<AsyncResult<String>> handler)` Watch the given keys to determine execution of the MULTI/EXEC block
    `RedisClient` | RedisClient.`zadd(String key, double score, String member, Handler<AsyncResult<Long>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisTransaction` | RedisTransaction.`zadd(String key, double score, String member, Handler<AsyncResult<String>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisClient` | RedisClient.`zaddMany(String key, Map<String,Double> members, Handler<AsyncResult<Long>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisTransaction` | RedisTransaction.`zaddMany(String key, Map<String,Double> members, Handler<AsyncResult<String>> handler)` Add one or more members to a sorted set, or update its score if it already exists
    `RedisClient` | RedisClient.`zcard(String key, Handler<AsyncResult<Long>> handler)` Get the number of members in a sorted set
    `RedisTransaction` | RedisTransaction.`zcard(String key, Handler<AsyncResult<String>> handler)` Get the number of members in a sorted set
    `RedisClient` | RedisClient.`zcount(String key, double min, double max, Handler<AsyncResult<Long>> handler)` Count the members in a sorted set with scores within the given values
    `RedisTransaction` | RedisTransaction.`zcount(String key, double min, double max, Handler<AsyncResult<String>> handler)` Count the members in a sorted set with scores within the given values
    `RedisClient` | RedisClient.`zincrby(String key, double increment, String member, Handler<AsyncResult<String>> handler)` Increment the score of a member in a sorted set
    `RedisTransaction` | RedisTransaction.`zincrby(String key, double increment, String member, Handler<AsyncResult<String>> handler)` Increment the score of a member in a sorted set
    `RedisClient` | RedisClient.`zinterstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key
    `RedisTransaction` | RedisTransaction.`zinterstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key
    `RedisClient` | RedisClient.`zinterstoreWeighed(String destkey, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key using weights for scoring
    `RedisTransaction` | RedisTransaction.`zinterstoreWeighed(String destkey, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Intersect multiple sorted sets and store the resulting sorted set in a new key using weights for scoring
    `RedisClient` | RedisClient.`zlexcount(String key, String min, String max, Handler<AsyncResult<Long>> handler)` Count the number of members in a sorted set between a given lexicographical range
    `RedisTransaction` | RedisTransaction.`zlexcount(String key, String min, String max, Handler<AsyncResult<String>> handler)` Count the number of members in a sorted set between a given lexicographical range
    `RedisClient` | RedisClient.`zrange(String key, long start, long stop, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by index
    `RedisTransaction` | RedisTransaction.`zrange(String key, long start, long stop, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by index
    `RedisClient` | RedisClient.`zrangebylex(String key, String min, String max, LimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by lexicographical range
    `RedisTransaction` | RedisTransaction.`zrangebylex(String key, String min, String max, LimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by lexicographical range
    `RedisClient` | RedisClient.`zrangebyscore(String key, String min, String max, RangeLimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by score
    `RedisTransaction` | RedisTransaction.`zrangebyscore(String key, String min, String max, RangeLimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by score
    `RedisClient` | RedisClient.`zrangeWithOptions(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by index
    `RedisTransaction` | RedisTransaction.`zrangeWithOptions(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by index
    `RedisClient` | RedisClient.`zrank(String key, String member, Handler<AsyncResult<Long>> handler)` Determine the index of a member in a sorted set
    `RedisTransaction` | RedisTransaction.`zrank(String key, String member, Handler<AsyncResult<String>> handler)` Determine the index of a member in a sorted set
    `RedisClient` | RedisClient.`zrem(String key, String member, Handler<AsyncResult<Long>> handler)` Remove one member from a sorted set
    `RedisTransaction` | RedisTransaction.`zrem(String key, String member, Handler<AsyncResult<String>> handler)` Remove one member from a sorted set
    `RedisClient` | RedisClient.`zremMany(String key, List<String> members, Handler<AsyncResult<Long>> handler)` Remove one or more members from a sorted set
    `RedisTransaction` | RedisTransaction.`zremMany(String key, List<String> members, Handler<AsyncResult<String>> handler)` Remove one or more members from a sorted set
    `RedisClient` | RedisClient.`zremrangebylex(String key, String min, String max, Handler<AsyncResult<Long>> handler)` Remove all members in a sorted set between the given lexicographical range
    `RedisTransaction` | RedisTransaction.`zremrangebylex(String key, String min, String max, Handler<AsyncResult<String>> handler)` Remove all members in a sorted set between the given lexicographical range
    `RedisClient` | RedisClient.`zremrangebyrank(String key, long start, long stop, Handler<AsyncResult<Long>> handler)` Remove all members in a sorted set within the given indexes
    `RedisTransaction` | RedisTransaction.`zremrangebyrank(String key, long start, long stop, Handler<AsyncResult<String>> handler)` Remove all members in a sorted set within the given indexes
    `RedisClient` | RedisClient.`zremrangebyscore(String key, String min, String max, Handler<AsyncResult<Long>> handler)` Remove all members in a sorted set within the given scores
    `RedisTransaction` | RedisTransaction.`zremrangebyscore(String key, String min, String max, Handler<AsyncResult<String>> handler)` Remove all members in a sorted set within the given scores
    `RedisClient` | RedisClient.`zrevrange(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by index, with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrange(String key, long start, long stop, RangeOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by index, with scores ordered from high to low
    `RedisClient` | RedisClient.`zrevrangebylex(String key, String max, String min, LimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by score, between the given lexicographical range with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrangebylex(String key, String max, String min, LimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by score, between the given lexicographical range with scores ordered from high to low
    `RedisClient` | RedisClient.`zrevrangebyscore(String key, String max, String min, RangeLimitOptions options, Handler<AsyncResult<JsonArray>> handler)` Return a range of members in a sorted set, by score, with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrangebyscore(String key, String max, String min, RangeLimitOptions options, Handler<AsyncResult<String>> handler)` Return a range of members in a sorted set, by score, with scores ordered from high to low
    `RedisClient` | RedisClient.`zrevrank(String key, String member, Handler<AsyncResult<Long>> handler)` Determine the index of a member in a sorted set, with scores ordered from high to low
    `RedisTransaction` | RedisTransaction.`zrevrank(String key, String member, Handler<AsyncResult<String>> handler)` Determine the index of a member in a sorted set, with scores ordered from high to low
    `RedisClient` | RedisClient.`zscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<JsonArray>> handler)` Incrementally iterate sorted sets elements and associated scores
    `RedisTransaction` | RedisTransaction.`zscan(String key, String cursor, ScanOptions options, Handler<AsyncResult<String>> handler)` Incrementally iterate sorted sets elements and associated scores
    `RedisClient` | RedisClient.`zscore(String key, String member, Handler<AsyncResult<String>> handler)` Get the score associated with the given member in a sorted set
    `RedisTransaction` | RedisTransaction.`zscore(String key, String member, Handler<AsyncResult<String>> handler)` Get the score associated with the given member in a sorted set
    `RedisClient` | RedisClient.`zunionstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Add multiple sorted sets and store the resulting sorted set in a new key
    `RedisTransaction` | RedisTransaction.`zunionstore(String destkey, List<String> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Add multiple sorted sets and store the resulting sorted set in a new key
    `RedisClient` | RedisClient.`zunionstoreWeighed(String key, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<Long>> handler)` Add multiple sorted sets using weights, and store the resulting sorted set in a new key
    `RedisTransaction` | RedisTransaction.`zunionstoreWeighed(String key, Map<String,Double> sets, AggregateOptions options, Handler<AsyncResult<String>> handler)` Add multiple sorted sets using weights, and store the resulting sorted set in a new key

  - ### Uses of Handler in io.vertx.rxjava.servicediscovery

    Methods in io.vertx.rxjava.servicediscovery with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static ServiceDiscovery` | ServiceDiscovery.`create(Vertx vertx, Handler<ServiceDiscovery> completionHandler)` Creates a new instance of `ServiceDiscovery` using the default configuration.
    `static ServiceDiscovery` | ServiceDiscovery.`create(Vertx vertx, ServiceDiscoveryOptions options, Handler<ServiceDiscovery> completionHandler)` Creates an instance of `ServiceDiscovery`.
    `void` | ServiceDiscovery.`getRecord(java.util.function.Function<Record,Boolean> filter, boolean includeOutOfService, Handler<AsyncResult<Record>> resultHandler)` Lookups for a single record.
    `void` | ServiceDiscovery.`getRecord(java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<Record>> resultHandler)` Lookups for a single record.
    `void` | ServiceDiscovery.`getRecord(JsonObject filter, Handler<AsyncResult<Record>> resultHandler)` Lookups for a single record.
    `void` | ServiceDiscovery.`getRecords(java.util.function.Function<Record,Boolean> filter, boolean includeOutOfService, Handler<AsyncResult<List<Record>>> resultHandler)` Lookups for a set of records.
    `void` | ServiceDiscovery.`getRecords(java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<List<Record>>> resultHandler)` Lookups for a set of records.
    `void` | ServiceDiscovery.`getRecords(JsonObject filter, Handler<AsyncResult<List<Record>>> resultHandler)` Lookups for a set of records.
    `void` | ServiceDiscovery.`publish(Record record, Handler<AsyncResult<Record>> resultHandler)` Publishes a record.
    `ServiceDiscovery` | ServiceDiscovery.`registerServiceExporter(ServiceExporter exporter, JsonObject configuration, Handler<AsyncResult<Void>> completionHandler)` Registers a discovery bridge.
    `ServiceDiscovery` | ServiceDiscovery.`registerServiceImporter(ServiceImporter importer, JsonObject configuration, Handler<AsyncResult<Void>> completionHandler)` Registers a discovery service importer.
    `void` | ServiceDiscovery.`unpublish(String id, Handler<AsyncResult<Void>> resultHandler)` Un-publishes a record.
    `void` | ServiceDiscovery.`update(Record record, Handler<AsyncResult<Record>> resultHandler)` Updates the given record.

  - ### Uses of Handler in io.vertx.rxjava.servicediscovery.spi

    Methods in io.vertx.rxjava.servicediscovery.spi with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ServiceExporter.`close(Handler<Void> closeHandler)` Close the exporter
    `void` | ServiceImporter.`close(Handler<Void> closeHandler)` Closes the importer
    `void` | ServicePublisher.`publish(Record record, Handler<AsyncResult<Record>> resultHandler)` Publishes a record.
    `void` | ServicePublisher.`unpublish(String id, Handler<AsyncResult<Void>> resultHandler)` Un-publishes a record.

  - ### Uses of Handler in io.vertx.rxjava.servicediscovery.types

    Methods in io.vertx.rxjava.servicediscovery.types with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject conf, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, JsonObject filter, JsonObject conf, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static <T> void` | MessageSource.`getConsumer(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<MessageConsumer<T>>> resultHandler)` Convenient method that looks for a message source and provides the configured .
    `static <T> void` | MessageSource.`getConsumer(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<MessageConsumer<T>>> resultHandler)` Convenient method that looks for a message source and provides the configured .
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject consumerConfiguration, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, JsonObject filter, JsonObject consumerConfiguration, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | MongoDataSource.`getMongoClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<MongoClient>> resultHandler)` Convenient method that looks for a Mongo datasource source and provides the configured `MongoClient`.
    `static void` | MongoDataSource.`getMongoClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<MongoClient>> resultHandler)` Convenient method that looks for a Mongo datasource source and provides the configured `MongoClient`.
    `static void` | MongoDataSource.`getMongoClient(ServiceDiscovery discovery, JsonObject filter, JsonObject consumerConfiguration, Handler<AsyncResult<MongoClient>> resultHandler)` Convenient method that looks for a Mongo datasource source and provides the configured `MongoClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject consumerConfiguration, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, JsonObject filter, JsonObject consumerConfiguration, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static <T> T` | EventBusService.`getServiceProxy(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Class<T> clientClass, Handler<AsyncResult<T>> resultHandler)` Lookup for a service record and if found, retrieve it and return the service object (used to consume the service).
    `static <T> T` | EventBusService.`getServiceProxyWithJsonFilter(ServiceDiscovery discovery, JsonObject filter, Class<T> clientClass, Handler<AsyncResult<T>> resultHandler)` Lookup for a service record and if found, retrieve it and return the service object (used to consume the service).
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject conf, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, JsonObject filter, JsonObject conf, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .

  - ### Uses of Handler in io.vertx.servicediscovery

    Methods in io.vertx.servicediscovery with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static ServiceDiscovery` | ServiceDiscovery.`create(Vertx vertx, Handler<ServiceDiscovery> completionHandler)` Creates a new instance of `ServiceDiscovery` using the default configuration.
    `static ServiceDiscovery` | ServiceDiscovery.`create(Vertx vertx, ServiceDiscoveryOptions options, Handler<ServiceDiscovery> completionHandler)` Creates an instance of `ServiceDiscovery`.
    `void` | ServiceDiscovery.`getRecord(java.util.function.Function<Record,Boolean> filter, boolean includeOutOfService, Handler<AsyncResult<Record>> resultHandler)` Lookups for a single record.
    `void` | ServiceDiscovery.`getRecord(java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<Record>> resultHandler)` Lookups for a single record.
    `void` | ServiceDiscovery.`getRecord(JsonObject filter, Handler<AsyncResult<Record>> resultHandler)` Lookups for a single record.
    `void` | ServiceDiscovery.`getRecords(java.util.function.Function<Record,Boolean> filter, boolean includeOutOfService, Handler<AsyncResult<List<Record>>> resultHandler)` Lookups for a set of records.
    `void` | ServiceDiscovery.`getRecords(java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<List<Record>>> resultHandler)` Lookups for a set of records.
    `void` | ServiceDiscovery.`getRecords(JsonObject filter, Handler<AsyncResult<List<Record>>> resultHandler)` Lookups for a set of records.
    `void` | ServiceDiscovery.`publish(Record record, Handler<AsyncResult<Record>> resultHandler)` Publishes a record.
    `ServiceDiscovery` | ServiceDiscovery.`registerServiceExporter(ServiceExporter exporter, JsonObject configuration, Handler<AsyncResult<Void>> completionHandler)` Registers a discovery bridge.
    `ServiceDiscovery` | ServiceDiscovery.`registerServiceImporter(ServiceImporter importer, JsonObject configuration, Handler<AsyncResult<Void>> completionHandler)` Registers a discovery service importer.
    `void` | ServiceDiscovery.`unpublish(String id, Handler<AsyncResult<Void>> resultHandler)` Un-publishes a record.
    `void` | ServiceDiscovery.`update(Record record, Handler<AsyncResult<Record>> resultHandler)` Updates the given record.

  - ### Uses of Handler in io.vertx.servicediscovery.backend.redis

    Methods in io.vertx.servicediscovery.backend.redis with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | RedisBackendService.`getRecord(String uuid, Handler<AsyncResult<Record>> resultHandler)`
    `void` | RedisBackendService.`getRecords(Handler<AsyncResult<List<Record>>> resultHandler)`
    `void` | RedisBackendService.`remove(Record record, Handler<AsyncResult<Record>> resultHandler)`
    `void` | RedisBackendService.`remove(String uuid, Handler<AsyncResult<Record>> resultHandler)`
    `void` | RedisBackendService.`store(Record record, Handler<AsyncResult<Record>> resultHandler)`
    `void` | RedisBackendService.`update(Record record, Handler<AsyncResult<Void>> resultHandler)`

  - ### Uses of Handler in io.vertx.servicediscovery.consul

    Methods in io.vertx.servicediscovery.consul with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ConsulServiceImporter.`close(Handler<Void> completionHandler)`

  - ### Uses of Handler in io.vertx.servicediscovery.docker

    Methods in io.vertx.servicediscovery.docker with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | DockerLinksServiceImporter.`close(Handler<Void> completionHandler)`

  - ### Uses of Handler in io.vertx.servicediscovery.kubernetes

    Methods in io.vertx.servicediscovery.kubernetes with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | KubernetesServiceImporter.`close(Handler<Void> completionHandler)`

  - ### Uses of Handler in io.vertx.servicediscovery.spi

    Methods in io.vertx.servicediscovery.spi with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `void` | ServiceExporter.`close(Handler<Void> closeHandler)` Close the exporter
    `default void` | ServiceImporter.`close(Handler<Void> closeHandler)` Closes the importer
    `void` | ServiceDiscoveryBackend.`getRecord(String uuid, Handler<AsyncResult<Record>> resultHandler)` Get the record with the given uuid.
    `void` | ServiceDiscoveryBackend.`getRecords(Handler<AsyncResult<List<Record>>> resultHandler)` Gets all the records
    `void` | ServicePublisher.`publish(Record record, Handler<AsyncResult<Record>> resultHandler)` Publishes a record.
    `void` | ServiceDiscoveryBackend.`remove(Record record, Handler<AsyncResult<Record>> resultHandler)` Removes a record.
    `void` | ServiceDiscoveryBackend.`remove(String uuid, Handler<AsyncResult<Record>> resultHandler)` Removes a records based on its UUID.
    `void` | ServiceDiscoveryBackend.`store(Record record, Handler<AsyncResult<Record>> resultHandler)` Stores a record.
    `void` | ServicePublisher.`unpublish(String id, Handler<AsyncResult<Void>> resultHandler)` Un-publishes a record.
    `void` | ServiceDiscoveryBackend.`update(Record record, Handler<AsyncResult<Void>> resultHandler)` Updates a record

  - ### Uses of Handler in io.vertx.servicediscovery.types

    Methods in io.vertx.servicediscovery.types with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `HttpClient`.
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject conf, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `HttpClient`.
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `HttpClient`.
    `static void` | HttpEndpoint.`getClient(ServiceDiscovery discovery, JsonObject filter, JsonObject conf, Handler<AsyncResult<HttpClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `HttpClient`.
    `static <T> void` | MessageSource.`getConsumer(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<MessageConsumer<T>>> resultHandler)` Convenient method that looks for a message source and provides the configured `MessageConsumer`.
    `static <T> void` | MessageSource.`getConsumer(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<MessageConsumer<T>>> resultHandler)` Convenient method that looks for a message source and provides the configured `MessageConsumer`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject consumerConfiguration, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | JDBCDataSource.`getJDBCClient(ServiceDiscovery discovery, JsonObject filter, JsonObject consumerConfiguration, Handler<AsyncResult<JDBCClient>> resultHandler)` Convenient method that looks for a JDBC datasource source and provides the configured `JDBCClient`.
    `static void` | MongoDataSource.`getMongoClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<MongoClient>> resultHandler)` Convenient method that looks for a Mongo datasource source and provides the configured `MongoClient`.
    `static void` | MongoDataSource.`getMongoClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<MongoClient>> resultHandler)` Convenient method that looks for a Mongo datasource source and provides the configured `MongoClient`.
    `static void` | MongoDataSource.`getMongoClient(ServiceDiscovery discovery, JsonObject filter, JsonObject consumerConfiguration, Handler<AsyncResult<MongoClient>> resultHandler)` Convenient method that looks for a Mongo datasource source and provides the configured `MongoClient`.
    `static <T> T` | EventBusService.`getProxy(ServiceDiscovery discovery, Class<T> itf, Handler<AsyncResult<T>> resultHandler)` Lookup for a service record and if found, retrieve it and return the service object (used to consume the service).
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject consumerConfiguration, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static void` | RedisDataSource.`getRedisClient(ServiceDiscovery discovery, JsonObject filter, JsonObject consumerConfiguration, Handler<AsyncResult<RedisClient>> resultHandler)` Convenient method that looks for a Redis data source and provides the configured `RedisClient`.
    `static <T> T` | EventBusService.`getServiceProxy(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Class<T> clientClass, Handler<AsyncResult<T>> resultHandler)` Lookup for a service record and if found, retrieve it and return the service object (used to consume the service).
    `static <T> T` | EventBusService.`getServiceProxyWithJsonFilter(ServiceDiscovery discovery, JsonObject filter, Class<T> clientClass, Handler<AsyncResult<T>> resultHandler)` Lookup for a service record and if found, retrieve it and return the service object (used to consume the service).
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `WebClient`.
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, java.util.function.Function<Record,Boolean> filter, JsonObject conf, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `WebClient`.
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, JsonObject filter, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured .
    `static void` | HttpEndpoint.`getWebClient(ServiceDiscovery discovery, JsonObject filter, JsonObject conf, Handler<AsyncResult<WebClient>> resultHandler)` Convenient method that looks for a HTTP endpoint and provides the configured `WebClient`.

  - ### Uses of Handler in io.vertx.serviceproxy

    Classes in io.vertx.serviceproxy that implement Handler
    Modifier and Type | Class and Description
    --- | ---
    `class` | `ProxyHandler`

  - ### Uses of Handler in io.vertx.spi.cluster.hazelcast

    Methods in io.vertx.spi.cluster.hazelcast with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `<K,V> void` | HazelcastClusterManager.`getAsyncMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> resultHandler)`
    `<K,V> void` | HazelcastClusterManager.`getAsyncMultiMap(String name, Handler<AsyncResult<AsyncMultiMap<K,V>>> resultHandler)` Every eventbus handler has an ID.
    `void` | HazelcastClusterManager.`getCounter(String name, Handler<AsyncResult<Counter>> resultHandler)`
    `void` | HazelcastClusterManager.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> resultHandler)`
    `void` | HazelcastClusterManager.`join(Handler<AsyncResult<Void>> resultHandler)`
    `void` | HazelcastClusterManager.`leave(Handler<AsyncResult<Void>> resultHandler)`

  - ### Uses of Handler in io.vertx.spi.cluster.ignite

    Methods in io.vertx.spi.cluster.ignite with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `<K,V> void` | IgniteClusterManager.`getAsyncMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> handler)`
    `<K,V> void` | IgniteClusterManager.`getAsyncMultiMap(String name, Handler<AsyncResult<AsyncMultiMap<K,V>>> handler)`
    `void` | IgniteClusterManager.`getCounter(String name, Handler<AsyncResult<Counter>> handler)`
    `void` | IgniteClusterManager.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> handler)`
    `void` | IgniteClusterManager.`join(Handler<AsyncResult<Void>> handler)`
    `void` | IgniteClusterManager.`leave(Handler<AsyncResult<Void>> handler)`

  - ### Uses of Handler in io.vertx.spi.cluster.zookeeper

    Methods in io.vertx.spi.cluster.zookeeper with parameters of type Handler
    Modifier and Type | Method and Description
    --- | ---
    `<K,V> void` | ZookeeperClusterManager.`getAsyncMap(String name, Handler<AsyncResult<AsyncMap<K,V>>> handler)`
    `<K,V> void` | ZookeeperClusterManager.`getAsyncMultiMap(String name, Handler<AsyncResult<AsyncMultiMap<K,V>>> handler)` Every eventbus handler has an ID.
    `void` | ZookeeperClusterManager.`getCounter(String name, Handler<AsyncResult<Counter>> resultHandler)`
    `void` | ZookeeperClusterManager.`getLockWithTimeout(String name, long timeout, Handler<AsyncResult<Lock>> resultHandler)`
    `void` | ZookeeperClusterManager.`join(Handler<AsyncResult<Void>> resultHandler)`
    `void` | ZookeeperClusterManager.`leave(Handler<AsyncResult<Void>> resultHandler)`

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