Package io.vertx.reactivex.pgclient.pubsub

## Class PgChannel

- java.lang.Object
- - io.vertx.reactivex.pgclient.pubsub.PgChannel

- All Implemented Interfaces:
    `io.vertx.lang.rx.RxDelegate`, `ReadStream<String>`, `StreamBase`

      public class PgChannel
      extends Object
      implements io.vertx.lang.rx.RxDelegate, ReadStream<String>

  A channel to Postgres that tracks the subscription to a given Postgres channel using the `LISTEN/UNLISTEN` commands.

  When paused the channel discards the messages.

  NOTE: This class has been automatically generated from the `original` non RX-ified interface using Vert.x codegen.

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static io.vertx.lang.rx.TypeArg<PgChannel>` | `__TYPE_ARG` |

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `PgChannel​(PgChannel delegate)` |
    `PgChannel​(Object delegate)` |

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `PgChannel` | `endHandler​(Handler<Void> endHandler)` | Set an handler to be called when no more notifications will be received.
    `boolean` | `equals​(Object o)` |
    `PgChannel` | `exceptionHandler​(Handler<Throwable> handler)` | Set an exception handler on the read stream.
    `ReadStream<String>` | `fetch​(long amount)` | Fetch the specified `amount` of elements.
    `PgChannel` | `getDelegate()` |
    `PgChannel` | `handler​(Handler<String> handler)` | Set or unset an handler to be called when a the channel is notified by Postgres.
    `int` | `hashCode()` |
    `static PgChannel` | `newInstance​(PgChannel arg)` |
    `PgChannel` | `pause()` | Pause the channel, all notifications are discarded.
    `Pipe<String>` | `pipe()` | Pause this stream and return a to transfer the elements of this stream to a destination .
    `Future<Void>` | `pipeTo​(WriteStream<String> dst)` | Pipe this `ReadStream` to the `WriteStream`.
    `PgChannel` | `resume()` | Resume the channel.
    `Completable` | `rxPipeTo​(WriteStream<String> dst)` | Pipe this `ReadStream` to the `WriteStream`.
    `PgChannel` | `subscribeHandler​(Handler<Void> handler)` | Set an handler called when the the channel get subscribed.
    `Flowable<String>` | `toFlowable()` |
    `Observable<String>` | `toObservable()` |
    `String` | `toString()` |

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### __TYPE_ARG

          public static final io.vertx.lang.rx.TypeArg<PgChannel> __TYPE_ARG

  - ### Constructor Detail

    - #### PgChannel

          public PgChannel​(PgChannel delegate)

    - #### PgChannel

          public PgChannel​(Object delegate)

  - ### Method Detail

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### equals

          public boolean equals​(Object o)

      Overrides:
        `equals` in class `Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### getDelegate

          public PgChannel getDelegate()

      Specified by:
        `getDelegate` in interface `ReadStream<String>`
      Specified by:
        `getDelegate` in interface `io.vertx.lang.rx.RxDelegate`
      Specified by:
        `getDelegate` in interface `StreamBase`

    - #### toObservable

          public Observable<String> toObservable()

      Specified by:
        `toObservable` in interface `ReadStream<String>`

    - #### toFlowable

          public Flowable<String> toFlowable()

      Specified by:
        `toFlowable` in interface `ReadStream<String>`

    - #### fetch

          public ReadStream<String> fetch​(long amount)

      Fetch the specified `amount` of elements. If the `ReadStream` has been paused, reading will recommence with the specified `amount` of items, otherwise the specified `amount` will be added to the current stream demand.
      Specified by:
        `fetch` in interface `ReadStream<String>`
      Parameters:
        `amount` -
      Returns:
        a reference to this, so the API can be used fluently

    - #### pipe

          public Pipe<String> pipe()

      Pause this stream and return a to transfer the elements of this stream to a destination .

      The stream will be resumed when the pipe will be wired to a `WriteStream`.
      Specified by:
        `pipe` in interface `ReadStream<String>`
      Returns:
        a pipe

    - #### pipeTo

          public Future<Void> pipeTo​(WriteStream<String> dst)

      Pipe this `ReadStream` to the `WriteStream`.

      Elements emitted by this stream will be written to the write stream until this stream ends or fails.

      Specified by:
        `pipeTo` in interface `ReadStream<String>`
      Parameters:
        `dst` - the destination write stream
      Returns:
        a future notified when the write stream will be ended with the outcome

    - #### rxPipeTo

          public Completable rxPipeTo​(WriteStream<String> dst)

      Pipe this `ReadStream` to the `WriteStream`.

      Elements emitted by this stream will be written to the write stream until this stream ends or fails.

      Specified by:
        `rxPipeTo` in interface `ReadStream<String>`
      Parameters:
        `dst` - the destination write stream
      Returns:
        a future notified when the write stream will be ended with the outcome

    - #### subscribeHandler

          public PgChannel subscribeHandler​(Handler<Void> handler)

      Set an handler called when the the channel get subscribed.
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### handler

          public PgChannel handler​(Handler<String> handler)

      Set or unset an handler to be called when a the channel is notified by Postgres.

      - when the handler is set, the subscriber sends a `LISTEN` command if needed
      - when the handler is unset, the subscriber sends a `UNLISTEN` command if needed
      Specified by:
        `handler` in interface `ReadStream<String>`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### pause

          public PgChannel pause()

      Pause the channel, all notifications are discarded.
      Specified by:
        `pause` in interface `ReadStream<String>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### resume

          public PgChannel resume()

      Resume the channel.
      Specified by:
        `resume` in interface `ReadStream<String>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### endHandler

          public PgChannel endHandler​(Handler<Void> endHandler)

      Set an handler to be called when no more notifications will be received.
      Specified by:
        `endHandler` in interface `ReadStream<String>`
      Parameters:
        `endHandler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### exceptionHandler

          public PgChannel exceptionHandler​(Handler<Throwable> handler)

      Description copied from interface: `ReadStream`
      Set an exception handler on the read stream.
      Specified by:
        `exceptionHandler` in interface `ReadStream<String>`
      Specified by:
        `exceptionHandler` in interface `StreamBase`
      Parameters:
        `handler` - the exception handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### newInstance

          public static PgChannel newInstance​(PgChannel arg)