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/**
* Copyright (c) 2004 - 2009 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.common.revision.cache.lru;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
/**
* @author Eike Stepper
*/
public class LRURevisionHolder extends DLRevisionHolder
{
private long usedStamp;
public LRURevisionHolder(InternalCDORevision revision)
{
super(null, revision);
usedStamp = System.currentTimeMillis();
}
@Override
public LRURevisionList getDLList()
{
return (LRURevisionList)super.getDLList();
}
@Override
protected void setDLList(DLRevisionList list)
{
if (list == null || list instanceof LRURevisionList)
{
super.setDLList(list);
}
else
{
throw new IllegalArgumentException("Not a " + LRURevisionList.class.getName() + ": " + list);
}
}
public long getUsedStamp()
{
return usedStamp;
}
@Override
public InternalCDORevision getRevision()
{
stamp();
return super.getRevision();
}
protected void stamp()
{
usedStamp = System.currentTimeMillis();
LRURevisionList list = getDLList();
if (list != null)
{
synchronized (list)
{
list.remove(this);
list.addHead(this);
}
}
}
}
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