net.sf.ehcache.event

Class CacheManagerEventListenerRegistry

java.lang.Object

net.sf.ehcache.event.CacheManagerEventListenerRegistry

All Implemented Interfaces:

CacheManagerEventListener

public class CacheManagerEventListenerRegistry
extends Object
implements CacheManagerEventListener

Registered listeners for registering and unregistering CacheManagerEventListeners and sending notifications to registrants.

There is one of these per CacheManager. It is a composite listener.

Since:

1.3

Version:

$Id$

Author:

Greg Luck

Constructor Summary

Constructors

Constructor and Description
CacheManagerEventListenerRegistry() Construct a new registry

Method Summary

Modifier and Type	Method and Description
void	dispose() Tell listeners to dispose themselves.
Set	getRegisteredListeners() Gets a Set of the listeners registered to this class
Status	getStatus() Returns the listener status.
boolean	hasRegisteredListeners() Returns whether or not at least one cache manager event listeners has been registered.
void	init() Initialises the listeners, ready to receive events.
void	notifyCacheAdded(String cacheName) Called immediately after a cache has been added and activated.
void	notifyCacheRemoved(String cacheName) Called immediately after a cache has been disposed and removed.
boolean	registerListener(CacheManagerEventListener cacheManagerEventListener) Adds a listener to the notification service.
String	toString() Returns a string representation of the object.
boolean	unregisterListener(CacheManagerEventListener cacheManagerEventListener) Removes a listener from the notification service.

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheManagerEventListenerRegistry

public CacheManagerEventListenerRegistry()

Construct a new registry

Method Detail

registerListener

public final boolean registerListener(CacheManagerEventListener cacheManagerEventListener)

Adds a listener to the notification service. No guarantee is made that listeners will be notified in the order they were added.

Parameters:

cacheManagerEventListener - the listener to add. Can be null, in which case nothing happens

Returns:

true if the listener is being added and was not already added

unregisterListener

public final boolean unregisterListener(CacheManagerEventListener cacheManagerEventListener)

Removes a listener from the notification service.

Parameters:

cacheManagerEventListener - the listener to remove

Returns:

true if the listener was present

hasRegisteredListeners

public boolean hasRegisteredListeners()

Returns whether or not at least one cache manager event listeners has been registered.

Returns:

true if a one or more listeners have registered, otherwise false

getRegisteredListeners

public Set getRegisteredListeners()

Gets a Set of the listeners registered to this class

Returns:

a set of type CacheManagerEventListener

init

public void init()

Initialises the listeners, ready to receive events.

Specified by:

init in interface CacheManagerEventListener

getStatus

public Status getStatus()

Returns the listener status.

Specified by:

getStatus in interface CacheManagerEventListener

Returns:

the status at the point in time the method is called

dispose

public void dispose()

Tell listeners to dispose themselves. Because this method is only ever called from a synchronized cache method, it does not itself need to be synchronized.

Specified by:

dispose in interface CacheManagerEventListener

notifyCacheAdded

public void notifyCacheAdded(String cacheName)

Called immediately after a cache has been added and activated.

Note that the CacheManager calls this method from a synchronized method. Any attempt to call a synchronized method on CacheManager from this method will cause a deadlock.

Note that activation will also cause a CacheEventListener status change notification from Status.STATUS_UNINITIALISED to Status.STATUS_ALIVE. Care should be taken on processing that notification because:

• the cache will not yet be accessible from the CacheManager.
• the addCaches methods which cause this notification are synchronized on the CacheManager. An attempt to call CacheManager.getEhcache(String) will cause a deadlock.

The calling method will block until this method returns.

Specified by:

notifyCacheAdded in interface CacheManagerEventListener

Parameters:

cacheName - the name of the Cache the operation relates to

See Also:

CacheEventListener

notifyCacheRemoved

public void notifyCacheRemoved(String cacheName)

Called immediately after a cache has been disposed and removed. The calling method will block until this method returns.

Note that the CacheManager calls this method from a synchronized method. Any attempt to call a synchronized method on CacheManager from this method will cause a deadlock.

Note that a CacheEventListener status changed will also be triggered. Any attempt from that notification to access CacheManager will also result in a deadlock.

Specified by:

notifyCacheRemoved in interface CacheManagerEventListener

Parameters:

cacheName - the name of the Cache the operation relates to

toString

public String toString()

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read.

Overrides:

toString in class Object

Returns:

a string representation of the object.