org.jasig.portlet.spring

Class SingletonDoubleCheckedCreator<T>

java.lang.Object

org.jasig.portlet.spring.DoubleCheckedCreator<T>

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

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

Provides a DoubleCheckedCreator impl that tracks the singleton instance internally

Author:

Eric Dalquist

Field Summary

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

logger, readLock, writeLock

Constructor Summary

Constructors

Constructor and Description
SingletonDoubleCheckedCreator()

Method Summary

Modifier and Type	Method and Description
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.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

Parameters:

args - args to pass to singleton object creator

Returns:

object

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()