org.oddjob.arooa.utils

Class ListenerSupportBase<T>

java.lang.Object

org.oddjob.arooa.utils.ListenerSupportBase<T>

Type Parameters:

T - The type of the listener.

Direct Known Subclasses:

ConfigurationOwnerSupport, ConfigurationSessionSupport

public class ListenerSupportBase<T>
extends Object

A Helper Class for tracking Listeners. Allows commands to be run on the first listener and when there are no more listeners. This is useful when the events are being notified in a chain and there is no need to subscribe when nothing is listening. For instance in the Oddjob JMX handlers.

Author:

rob

Constructor Summary

Constructors

Constructor and Description
ListenerSupportBase()

Method Summary

Modifier and Type	Method and Description
protected void	addListener(T listener)
protected List<T>	copy()
void	destroy() Remove listeners on run onEmpty.
Runnable	getOnEmpty()
Runnable	getOnFirst()
protected void	removeListener(T listener)
void	setOnEmpty(Runnable onEmpty) Set an action to be run when the last listener has been removed.
void	setOnFirst(Runnable onFirst) Set an action to run when the first listener is added.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListenerSupportBase

public ListenerSupportBase()

Method Detail

copy

protected List<T> copy()

addListener

protected void addListener(T listener)

removeListener

protected void removeListener(T listener)

getOnFirst

public Runnable getOnFirst()

setOnFirst

public void setOnFirst(Runnable onFirst)

Set an action to run when the first listener is added.

Parameters:

onFirst -

getOnEmpty

public Runnable getOnEmpty()

setOnEmpty

public void setOnEmpty(Runnable onEmpty)

Set an action to be run when the last listener has been removed.

Parameters:

onEmpty -

destroy

public void destroy()

Remove listeners on run onEmpty.