org.axonframework.eventhandling

Class AbstractCluster

java.lang.Object

org.axonframework.eventhandling.AbstractCluster

All Implemented Interfaces:

Cluster

Direct Known Subclasses:

SimpleCluster

public abstract class AbstractCluster
extends Object
implements Cluster

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.

Since:

1.2

Author:

Allard Buijze

Constructor Summary

Constructors

Constructor and Description
AbstractCluster()

Method Summary

Methods

Modifier and Type	Method and Description
Set<EventListener>	getMembers() Returns a read-only view on the members in the cluster.
ClusterMetaData	getMetaData() Returns the MetaData of this Cluster.
void	subscribe(EventListener eventListener) Subscribe the given eventListener to this cluster.
void	unsubscribe(EventListener eventListener) Unsubscribes the given eventListener from this cluster.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.axonframework.eventhandling.Cluster

publish

Constructor Detail

AbstractCluster

public AbstractCluster()

Method Detail

subscribe

public void subscribe(EventListener eventListener)

Description copied from interface: Cluster

Subscribe the given eventListener to this cluster. If the listener is already subscribed, nothing happens.

While the Event Listeners is subscribed, it will receive all messages published to the cluster.

Specified by:

subscribe in interface Cluster

Parameters:

eventListener - the Event Listener instance to subscribe

unsubscribe

public void unsubscribe(EventListener eventListener)

Description copied from interface: Cluster

Unsubscribes the given eventListener from this cluster. If the listener is already unsubscribed, or was never subscribed, nothing happens.

Specified by:

unsubscribe in interface Cluster

Parameters:

eventListener - the Event Listener instance to unsubscribe

getMetaData

public ClusterMetaData getMetaData()

Description copied from interface: Cluster

Returns the MetaData of this Cluster.

Specified by:

getMetaData in interface Cluster

Returns:

the MetaData of this Cluster

getMembers

public Set<EventListener> getMembers()

Returns a read-only view on the members in the cluster. This view may be updated by the Cluster when members subscribe or unsubscribe. Cluster implementations may also return the view representing the state at the moment this method is invoked.

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 Iterator.remove() method to be invoked.

Specified by:

getMembers in interface Cluster

Returns:

a view of the members of this cluster