/******************************************************************************* | |
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. All rights reserved. | |
* This program and the accompanying materials are made available under the | |
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 | |
* which accompanies this distribution. | |
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html | |
* and the Eclipse Distribution License is available at | |
* http://www.eclipse.org/org/documents/edl-v10.php. | |
* | |
* Contributors: | |
* Oracle - initial API and implementation from Oracle TopLink | |
******************************************************************************/ | |
package org.eclipse.persistence.internal.identitymaps; | |
import org.eclipse.persistence.descriptors.ClassDescriptor; | |
import org.eclipse.persistence.internal.sessions.AbstractSession; | |
/** | |
* <p><b>Purpose</b>: A SoftIdentityMap holds all objects referenced by the application. | |
* The soft identity map is similar to the weak identity map except for the fact that it allows | |
* only garbage collects when memory is low. | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Guarantees identity. | |
* <li> Allows garbage collection when memory is low. | |
* </ul> | |
* @author James Sutherland | |
* @since TopLink 11g | |
*/ | |
public class SoftIdentityMap extends WeakIdentityMap { | |
public SoftIdentityMap(int size, ClassDescriptor descriptor, AbstractSession session, boolean isIsolated) { | |
super(size, descriptor, session, isIsolated); | |
this.cleanupCount = 0; | |
this.cleanupSize = size; | |
} | |
@Override | |
public CacheKey createCacheKey(Object primaryKey, Object object, Object writeLockValue, long readTime) { | |
return new SoftCacheKey(primaryKey, object, writeLockValue, readTime, isIsolated); | |
} | |
} |