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  * Copyright (c) 2010-2011. Axon Framework
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.axonframework.eventhandling;
Abstract Cluster implementation that keeps track of Cluster members (EventListeners). This implementation is thread-safe. The getMembers() method returns a read-only runtime view of the members in the cluster.

Allard Buijze
public abstract class AbstractCluster implements Cluster {
    private final Set<EventListenereventListeners = new CopyOnWriteArraySet<EventListener>();
    private final Set<EventListenerimmutableEventListeners = Collections.unmodifiableSet();
    private final ClusterMetaData clusterMetaData = new DefaultClusterMetaData();
    public void subscribe(EventListener eventListener) {
    public void unsubscribe(EventListener eventListener) {
    public ClusterMetaData getMetaData() {
        return ;


This implementation returns a real-time view on the actual members, which changes when members join or leave the cluster. Iterators created from the returned set are thread-safe and iterate over the members available at the time the iterator was created. The iterator does not allow the java.util.Iterator.remove() method to be invoked.

    public Set<EventListenergetMembers() {
        return ;
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