org.apache.activemq.artemis.api.core.client

## Interface ClusterTopologyListener

-     public interface ClusterTopologyListener

  A cluster topology listener.

  Used to get notification of topology events. After adding a listener to the cluster connection, the listener receives `nodeUP(TopologyMember, boolean)` for all the current topology members.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `nodeDown(long eventUID, String nodeID)` Triggered when a node leaves the cluster.
    `void` | `nodeUP(TopologyMember member, boolean last)` Triggered when a node joins the cluster.

- - ### Method Detail

    - #### nodeUP

          void nodeUP(TopologyMember member,
                      boolean last)

      Triggered when a node joins the cluster.
      Parameters:
        `member` -
        `last` - if the whole cluster topology is being transmitted (after adding the listener to the cluster connection) this parameter will be `true` for the last topology member.

    - #### nodeDown

          void nodeDown(long eventUID,
                        String nodeID)

      Triggered when a node leaves the cluster.
      Parameters:
        `eventUID` -
        `nodeID` - the id of the node leaving the cluster

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