infinispan.com.mchange.v1.cachedstore.SoftReferenceCachedStore Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.7
*
* Copyright (C) 2014 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.cachedstore;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;
/**
* by default, this class is NOT thread safe!!! use the synchronized
* wrappers defined in CachedStoreUtils for multithreaded situations!
*
* @see CachedStoreUtils#synchronizedCachedStore
* @see CachedStoreUtils#synchronizedTweakableCachedStore
*/
class SoftReferenceCachedStore extends ValueTransformingCachedStore
{
public SoftReferenceCachedStore(CachedStore.Manager manager)
{ super( manager ); }
protected Object toUserValue( Object cacheValue )
{ return cacheValue == null ? null : ((SoftReference) cacheValue).get(); }
protected Object toCacheValue( Object userValue )
{ return userValue == null ? null : new SoftReference( userValue ); }
}