# Package io.vertx.core.shareddata

- Interface Summary
  Interface | Description
  --- | ---
  AsyncMap<K,V> | An asynchronous map.
  Counter | An asynchronous counter that can be used to across the cluster to maintain a consistent count.
  LocalMap<K,V> | Local maps can be used to share data safely in a single Vert.x instance.
  Lock | An asynchronous exclusive lock which can be obtained from any node in the cluster.
  Shareable | An interface which allows you to put arbitrary objects into a `LocalMap`.
  SharedData | Shared data allows you to share data safely between different parts of your application in a safe way.

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