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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:
* Simon McDuff - initial API and implementation
* Eike Stepper - maintenance
**************************************************************************/
package org.eclipse.emf.cdo.internal.server;
import org.eclipse.emf.cdo.protocol.CDOID;
import org.eclipse.emf.cdo.protocol.revision.CDORevision;
import org.eclipse.emf.cdo.server.ISession;
import org.eclipse.emf.cdo.server.IView;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
/**
* @author Simon McDuff
*/
public class MEMStore extends Store
{
public static final String TYPE = "mem";
private Map<CDOID, List<CDORevision>> revisions = new HashMap<CDOID, List<CDORevision>>()
{
private static final long serialVersionUID = 1L;
@Override
public String toString()
{
List<Entry<CDOID, List<CDORevision>>> entries = new ArrayList<Entry<CDOID, List<CDORevision>>>(entrySet());
Collections.sort(entries, new Comparator<Entry<CDOID, List<CDORevision>>>()
{
public int compare(Entry<CDOID, List<CDORevision>> o1, Entry<CDOID, List<CDORevision>> o2)
{
return o1.getKey().compareTo(o2.getKey());
}
});
StringBuilder builder = new StringBuilder();
for (Entry<CDOID, List<CDORevision>> entry : entries)
{
builder.append(entry.getKey());
builder.append(" -->");
for (CDORevision revision : entry.getValue())
{
builder.append(" ");
builder.append(revision);
}
builder.append("\n");
}
return builder.toString();
}
};
public MEMStore()
{
super(TYPE);
}
public synchronized CDORevision getRevision(CDOID id)
{
List<CDORevision> list = revisions.get(id);
if (list != null)
{
return list.get(list.size() - 1);
}
return null;
}
public synchronized CDORevision getRevisionByVersion(CDOID id, int version)
{
List<CDORevision> list = revisions.get(id);
if (list != null)
{
return getRevisionByVersion(list, version);
}
return null;
}
public synchronized void addRevision(CDORevision revision)
{
CDOID id = revision.getID();
List<CDORevision> list = revisions.get(id);
if (list == null)
{
list = new ArrayList<CDORevision>();
revisions.put(id, list);
}
CDORevision rev = getRevisionByVersion(list, revision.getVersion());
if (rev != null)
{
throw new IllegalStateException("Concurrent modification of revision " + rev);
}
list.add(revision);
}
public synchronized boolean removeRevision(CDORevision revision)
{
CDOID id = revision.getID();
List<CDORevision> list = revisions.get(id);
if (list == null)
{
return false;
}
for (Iterator<CDORevision> it = list.iterator(); it.hasNext();)
{
CDORevision rev = it.next();
if (rev.getVersion() == revision.getVersion())
{
it.remove();
return true;
}
}
return false;
}
@Override
public boolean hasWriteDeltaSupport()
{
return true;
}
@Override
public boolean hasAuditingSupport()
{
return true;
}
public void repairAfterCrash()
{
}
@Override
public MEMStoreAccessor createReader(ISession session)
{
return new MEMStoreAccessor(this, session);
}
@Override
public MEMStoreAccessor createWriter(IView view)
{
return new MEMStoreAccessor(this, view);
}
@Override
protected void doDeactivate() throws Exception
{
revisions.clear();
super.doDeactivate();
}
private CDORevision getRevisionByVersion(List<CDORevision> list, int version)
{
for (CDORevision revision : list)
{
if (revision.getVersion() == version)
{
return revision;
}
}
return null;
}
}
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