org.jasig.portlet.newsreader.spring
Class SingletonDoubleCheckedCreator<T>

java.lang.Object
  org.jasig.portlet.newsreader.spring.DoubleCheckedCreator<T>
      org.jasig.portlet.newsreader.spring.SingletonDoubleCheckedCreator<T>

public abstract class SingletonDoubleCheckedCreator<T>
extends DoubleCheckedCreator<T>

Provides a DoubleCheckedCreator impl that tracks the singleton instance internally

Version:

$Revision$

Author:

Eric Dalquist

Field Summary

Fields inherited from class org.jasig.portlet.newsreader.spring.DoubleCheckedCreator

logger, readLock, writeLock

Constructor Summary

SingletonDoubleCheckedCreator()

Method Summary

protected T	create(Object... args)
protected abstract T	createSingleton(Object... args) Called only once as long as it returns successfully
boolean	isCreated()
protected T	retrieve(Object... args)
String	toString()

Methods inherited from class org.jasig.portlet.newsreader.spring.DoubleCheckedCreator

get, invalid

Methods inherited from class java.lang.Object

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

Constructor Detail

SingletonDoubleCheckedCreator

public SingletonDoubleCheckedCreator()

Method Detail

createSingleton

protected abstract T createSingleton(Object... args)

Called only once as long as it returns successfully

See Also:

DoubleCheckedCreator.create(Object...)

create

protected final T create(Object... args)

Specified by:

create in class DoubleCheckedCreator<T>

Parameters:

args - Arguments to use when creating the object

Returns:

A newly created object

retrieve

protected final T retrieve(Object... args)

Specified by:

retrieve in class DoubleCheckedCreator<T>

Parameters:

args - Arguments to use when retrieving the object

Returns:

An existing object if available

isCreated

public final boolean isCreated()

Returns:

true if the singleton has been created as of this call

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()