org.jboss.kernel.plugins.event
Class AbstractEventEmitter

java.lang.Object
  org.jboss.kernel.plugins.event.AbstractEventEmitter

All Implemented Interfaces:

KernelEventEmitter

Direct Known Subclasses:

AbstractKernelObject

public class AbstractEventEmitter
extends Object
implements KernelEventEmitter

Abstract Event emitter.

Version:

$Revision: 59020 $

Author:

Adrian Brock

Field Summary

protected Map<KernelEventFilter,Map<Object,List<KernelEventListener>>>	eventListenerRegistry The registry Map>>
protected static Object	NULL Used to represent a null parameter
protected static KernelEventFilter	NULL_FILTER Used to represent a null filter

Constructor Summary

AbstractEventEmitter()

Method Summary

KernelEvent	createEvent(String type, Object context) Make a new event
void	fireKernelEvent(KernelEvent event) Fire an event
protected void	fireKernelEvent(KernelEventListener listener, KernelEvent event, Object handback) Fire a kernel event to a single listener
boolean	hasListeners() Do we have listeners
protected long	nextEmitterSequence() Get the next emitter sequence
void	registerListener(KernelEventListener listener, KernelEventFilter filter, Object handback) Register a listener
void	unregisterListener(KernelEventListener listener, KernelEventFilter filter, Object handback) Unregister a listener

Methods inherited from class java.lang.Object

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

Field Detail

NULL

protected static final Object NULL

Used to represent a null parameter

NULL_FILTER

protected static final KernelEventFilter NULL_FILTER

Used to represent a null filter

eventListenerRegistry

protected Map<KernelEventFilter,Map<Object,List<KernelEventListener>>> eventListenerRegistry

The registry Map>>

Constructor Detail

AbstractEventEmitter

public AbstractEventEmitter()

Method Detail

hasListeners

public boolean hasListeners()

Do we have listeners

Returns:

true when there are listeners

createEvent

public KernelEvent createEvent(String type,
                               Object context)

Make a new event

Parameters:

type - the event type

context - the context

Returns:

the event

registerListener

public void registerListener(KernelEventListener listener,
                             KernelEventFilter filter,
                             Object handback)
                      throws Throwable

Description copied from interface: KernelEventEmitter

Register a listener

Specified by:

registerListener in interface KernelEventEmitter

Parameters:

listener - the listener

filter - the filter

handback - the handback object

Throws:

Throwable - for any error

unregisterListener

public void unregisterListener(KernelEventListener listener,
                               KernelEventFilter filter,
                               Object handback)
                        throws Throwable

Description copied from interface: KernelEventEmitter

Unregister a listener

Specified by:

unregisterListener in interface KernelEventEmitter

Parameters:

listener - the listener

filter - the filter

handback - the handback object

Throws:

Throwable - for any error

fireKernelEvent

public void fireKernelEvent(KernelEvent event)

Description copied from interface: KernelEventEmitter

Fire an event

Specified by:

fireKernelEvent in interface KernelEventEmitter

Parameters:

event - the event

fireKernelEvent

protected void fireKernelEvent(KernelEventListener listener,
                               KernelEvent event,
                               Object handback)

Fire a kernel event to a single listener

Parameters:

listener - the listener

event - the event

handback - the handback object

nextEmitterSequence

protected long nextEmitterSequence()

Get the next emitter sequence

Returns:

the next emitter sequence