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/**
* Copyright (c) 2004 - 2010 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
* Simon McDuff - bug 201266
* Simon McDuff - bug 230832
*/
package org.eclipse.emf.cdo.internal.common.revision.cache.two;
import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.branch.CDOBranchPoint;
import org.eclipse.emf.cdo.common.branch.CDOBranchVersion;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.cache.CDORevisionCache;
import org.eclipse.emf.cdo.common.revision.cache.InternalCDORevisionCache;
import org.eclipse.emf.cdo.internal.common.bundle.OM;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.net4j.util.CheckUtil;
import org.eclipse.net4j.util.event.IEvent;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import org.eclipse.net4j.util.lifecycle.LifecycleUtil;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import org.eclipse.emf.ecore.EClass;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @author Eike Stepper
*/
public class TwoLevelRevisionCache extends Lifecycle implements InternalCDORevisionCache, IListener
{
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG_REVISION, TwoLevelRevisionCache.class);
private InternalCDORevisionCache level1;
private InternalCDORevisionCache level2;
public TwoLevelRevisionCache()
{
}
public InternalCDORevisionCache instantiate(CDORevision revision)
{
TwoLevelRevisionCache cache = new TwoLevelRevisionCache();
cache.setLevel1(level1.instantiate(revision));
cache.setLevel2(level2.instantiate(revision));
return cache;
}
public boolean isSupportingBranches()
{
return false;
}
public InternalCDORevisionCache getLevel1()
{
return level1;
}
public void setLevel1(InternalCDORevisionCache level1)
{
this.level1 = level1;
}
public InternalCDORevisionCache getLevel2()
{
return level2;
}
public void setLevel2(InternalCDORevisionCache level2)
{
this.level2 = level2;
}
public EClass getObjectType(CDOID id)
{
EClass objectType = level1.getObjectType(id);
if (objectType == null)
{
objectType = level2.getObjectType(id);
}
return objectType;
}
public CDORevision getRevision(CDOID id, CDOBranchPoint branchPoint)
{
CDORevision revision = level1.getRevision(id, branchPoint);
if (revision == null)
{
revision = level2.getRevision(id, branchPoint);
}
return revision;
}
public CDORevision getRevisionByVersion(CDOID id, CDOBranchVersion branchVersion)
{
CDORevision revision = level1.getRevisionByVersion(id, branchVersion);
if (revision == null)
{
revision = level2.getRevisionByVersion(id, branchVersion);
}
return revision;
}
public List<CDORevision> getCurrentRevisions()
{
List<CDORevision> revisions = new ArrayList<CDORevision>();
revisions.addAll(level1.getCurrentRevisions());
revisions.addAll(level2.getCurrentRevisions());
return revisions;
}
public boolean addRevision(CDORevision revision)
{
CheckUtil.checkArg(revision, "revision");
boolean added = level1.addRevision(revision);
// Bugzilla 292372: If a new current revision was added to level1, we must check whether
// level2 contains a stale current revision, and revise that revision if possible
if (added && !revision.isHistorical())
{
CDOID id = revision.getID();
CDORevision revisionInLevel2 = level2.getRevision(id, revision);
if (revisionInLevel2 != null && !revisionInLevel2.isHistorical())
{
// We can only revise if the revisions are consecutive
if (revision.getVersion() == revisionInLevel2.getVersion() + 1)
{
((InternalCDORevision)revisionInLevel2).setRevised(revision.getTimeStamp() - 1);
}
else
{
level2.removeRevision(id, revision.getBranch().getVersion(revisionInLevel2.getVersion()));
}
}
}
return added;
}
public CDORevision removeRevision(CDOID id, CDOBranchVersion branchVersion)
{
CDORevision revision1 = level1.removeRevision(id, branchVersion);
CDORevision revision2 = level2.removeRevision(id, branchVersion);
return revision1 != null ? revision1 : revision2;
}
public void clear()
{
level1.clear();
level2.clear();
}
public Map<CDOBranch, List<CDORevision>> getAllRevisions()
{
throw new UnsupportedOperationException();
}
public void notifyEvent(IEvent event)
{
if (event instanceof EvictionEvent)
{
EvictionEvent e = (EvictionEvent)event;
CDORevision revision = e.getRevision();
if (revision != null)
{
CDORevisionCache cache = e.getSource();
if (cache == level1)
{
evictedFromLevel1(revision);
}
else if (cache == level2)
{
evictedFromLevel2(revision);
}
}
}
}
protected void evictedFromLevel1(CDORevision revision)
{
level2.addRevision(revision);
if (TRACER.isEnabled())
{
TRACER.format("Recached revision {0}", revision); //$NON-NLS-1$
}
}
protected void evictedFromLevel2(CDORevision revision)
{
}
@Override
protected void doBeforeActivate() throws Exception
{
super.doBeforeActivate();
checkState(level1, "level1"); //$NON-NLS-1$
checkState(level2, "level2"); //$NON-NLS-1$
}
@Override
protected void doActivate() throws Exception
{
super.doActivate();
level1.addListener(this);
level2.addListener(this);
LifecycleUtil.activate(level1);
LifecycleUtil.activate(level2);
}
@Override
protected void doDeactivate() throws Exception
{
LifecycleUtil.deactivate(level2);
LifecycleUtil.deactivate(level1);
level2.removeListener(this);
level1.removeListener(this);
super.doDeactivate();
}
}
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