# Package io.vertx.core.spi.cluster

- Interface Summary
  Interface | Description
  --- | ---
  AsyncMultiMap<K,V> | An asynchronous multi-map.
  ChoosableIterable<T> | An extension of Iterable which allows keeps track of an iterator internally to allow the next element to be chosen
  ClusterManager | A cluster provider for Vert.x must implement this interface.
  NodeListener | A NodeListener is called when nodes join or leave the cluster

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