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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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.net4j.util.tests.cache;
import org.eclipse.net4j.util.cache.Cache;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* @author Eike Stepper
*/
public class RevisionManager extends Cache<Revision>
{
private Map<Integer, TimeLine> timeLines = new HashMap<Integer, TimeLine>();
public RevisionManager()
{
}
public Revision getRevision(int id, int version)
{
TimeLine timeLine = getTimeLine(id);
return timeLine.getRevision(version);
}
public void evictElements(int elementCount)
{
}
protected TimeLine getTimeLine(int id)
{
TimeLine timeLine = timeLines.get(id);
if (timeLine == null)
{
timeLine = new TimeLine(id);
timeLines.put(id, timeLine);
}
return timeLine;
}
protected Revision loadRevision(int id, int version)
{
Revision revision = new Revision(this, id, version);
return revision;
}
protected void finalizeRevision(Revision revision)
{
// TimeLine timeLine = getTimeLine(revision.getID());
// timeLine.addRevision(revision);
}
@Override
protected void unreachableElement(Reference<? extends Revision> reference)
{
}
/**
* @author Eike Stepper
*/
private class TimeLine
{
private int id;
private List<Reference<Revision>> revisions = new ArrayList<Reference<Revision>>();
public TimeLine(int id)
{
this.id = id;
}
public int getID()
{
return id;
}
public Revision getRevision(int version)
{
for (Iterator<Reference<Revision>> it = revisions.iterator(); it.hasNext();)
{
Reference<Revision> reference = it.next();
Revision revision = reference.get();
if (revision != null)
{
if (revision.getVersion() == version)
{
return revision;
}
}
else
{
it.remove();
break;
}
}
long time = System.currentTimeMillis();
Revision revision = loadRevision(id, version);
time = System.currentTimeMillis() - time;
addRevision(revision);
return revision;
}
public void addRevision(Revision revision)
{
revisions.add(new CacheElement(revision, getReferenceQueue()));
}
}
/**
* @author Eike Stepper
*/
private static final class CacheElement extends SoftReference<Revision>
{
private int id;
private int version;
// private Reference<Revision> ref;
public CacheElement(Revision revision, ReferenceQueue<Revision> queue)
{
super(revision, queue);
// ref = new WeakReference<Revision>(revision, queue);
id = revision.getID();
version = revision.getVersion();
}
public int getID()
{
return id;
}
public int getVersion()
{
return version;
}
@Override
public String toString()
{
return "R" + id + "v" + version + (get() == null ? "" : " UNCLEARED");
}
}
}
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