org.axonframework.eventhandling

Class AbstractClusterSelector

java.lang.Object

org.axonframework.eventhandling.AbstractClusterSelector

All Implemented Interfaces:

ClusterSelector

Direct Known Subclasses:

AnnotationClusterSelector, ClassNamePatternClusterSelector, ClassNamePrefixClusterSelector

public abstract class AbstractClusterSelector
extends Object
implements ClusterSelector

Abstract implementation of the ClusterSelector interface that detects proxies and passes the actual Class of the Event Listener implementation. Typically, this occurs when annotated event handlers are used. The doSelectCluster(org.axonframework.eventhandling.EventListener, Class) method, in such case, returns the Class of the annotated listener.

Since:

2.0

Author:

Allard Buijze

Constructor Summary

Constructors

Constructor and Description
AbstractClusterSelector()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract Cluster	doSelectCluster(EventListener eventListener, Class<?> listenerType) Select a cluster for the given eventListener, which has the actual class listenerType.
Cluster	selectCluster(EventListener eventListener) Selects the cluster instance that the given eventListener should be member of.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractClusterSelector

public AbstractClusterSelector()

Method Detail

selectCluster

public Cluster selectCluster(EventListener eventListener)

Description copied from interface: ClusterSelector

Selects the cluster instance that the given eventListener should be member of. This may be an existing (or pre-configured) cluster, as well as a newly created cluster.

When null is returned, this may cause the Event Listener not to be subscribed to any cluster at all.

Specified by:

selectCluster in interface ClusterSelector

Parameters:

eventListener - the event listener to select a cluster for

Returns:

The Cluster assigned to the listener

doSelectCluster

protected abstract Cluster doSelectCluster(EventListener eventListener,
                      Class<?> listenerType)

Select a cluster for the given eventListener, which has the actual class listenerType. Note that the given listenerType does not have to be assignable to EventListener, as it is possible that the eventListener acts as a proxy to an instance of listenerType.

Parameters:

eventListener - The listener instance handling the events, possibly a proxy

listenerType - The actual type of the Event Listener

Returns:

the cluster to assign the Event Listener to