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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
* Simon McDuff - http://bugs.eclipse.org/201266
* Simon McDuff - http://bugs.eclipse.org/230832
**************************************************************************/
package org.eclipse.emf.cdo.internal.common.revision;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.model.CDOClass;
import org.eclipse.emf.cdo.common.model.CDOPackageManager;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.CDORevisionResolver;
import org.eclipse.emf.cdo.common.revision.cache.CDORevisionCache;
import org.eclipse.emf.cdo.common.revision.cache.CDORevisionCacheUtil;
import org.eclipse.emf.cdo.internal.common.bundle.OM;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import org.eclipse.net4j.util.lifecycle.LifecycleUtil;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* @author Eike Stepper
*/
public abstract class CDORevisionResolverImpl extends Lifecycle implements CDORevisionResolver
{
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG_REVISION, CDORevisionResolverImpl.class);
private CDORevisionCache cache;
public CDORevisionResolverImpl()
{
}
public CDORevisionCache getCache()
{
return cache;
}
public void setCache(CDORevisionCache cache)
{
this.cache = cache;
}
public boolean containsRevision(CDOID id)
{
return cache.getRevision(id) != null;
}
public boolean containsRevisionByTime(CDOID id, long timeStamp)
{
return cache.getRevisionByTime(id, timeStamp) != null;
}
public boolean containsRevisionByVersion(CDOID id, int version)
{
return cache.getRevisionByVersion(id, version) != null;
}
public CDOClass getObjectType(CDOID id)
{
return cache.getObjectType(id);
}
public InternalCDORevision getRevision(CDOID id, int referenceChunk)
{
return getRevision(id, referenceChunk, true);
}
public InternalCDORevision getRevision(CDOID id, int referenceChunk, boolean loadOnDemand)
{
InternalCDORevision revision = cache.getRevision(id);
if (revision == null)
{
if (loadOnDemand)
{
if (TRACER.isEnabled())
{
TRACER.format("Loading revision {0}", id);
}
revision = loadRevision(id, referenceChunk);
addCachedRevisionIfNotNull(revision);
}
}
else
{
InternalCDORevision oldRevision = revision;
revision = verifyRevision(oldRevision, referenceChunk);
if (revision != oldRevision)
{
addCachedRevisionIfNotNull(revision);
}
}
return revision;
}
public InternalCDORevision getRevisionByTime(CDOID id, int referenceChunk, long timeStamp)
{
return getRevisionByTime(id, referenceChunk, timeStamp, true);
}
public InternalCDORevision getRevisionByTime(CDOID id, int referenceChunk, long timeStamp, boolean loadOnDemand)
{
InternalCDORevision revision = cache.getRevisionByTime(id, timeStamp);
if (revision == null)
{
if (loadOnDemand)
{
if (TRACER.isEnabled())
{
TRACER.format("Loading revision {0} by time {1,date} {1,time}", id, timeStamp);
}
revision = loadRevisionByTime(id, referenceChunk, timeStamp);
addCachedRevisionIfNotNull(revision);
}
}
else
{
InternalCDORevision verified = verifyRevision(revision, referenceChunk);
if (revision != verified)
{
addCachedRevisionIfNotNull(verified);
revision = verified;
}
}
return revision;
}
public synchronized InternalCDORevision getRevisionByVersion(CDOID id, int referenceChunk, int version)
{
return getRevisionByVersion(id, referenceChunk, version, true);
}
public InternalCDORevision getRevisionByVersion(CDOID id, int referenceChunk, int version, boolean loadOnDemand)
{
InternalCDORevision revision = cache.getRevisionByVersion(id, version);
if (revision == null)
{
if (loadOnDemand)
{
if (TRACER.isEnabled())
{
TRACER.format("Loading revision {0} by version {1}", id, version);
}
revision = loadRevisionByVersion(id, referenceChunk, version);
addCachedRevisionIfNotNull(revision);
}
}
return revision;
}
public List<CDORevision> getRevisions(Collection<CDOID> ids, int referenceChunk)
{
List<CDOID> missingIDs = new ArrayList<CDOID>(0);
List<CDORevision> revisions = new ArrayList<CDORevision>(ids.size());
for (CDOID id : ids)
{
InternalCDORevision revision = getRevision(id, referenceChunk, false);
revisions.add(revision);
if (revision == null)
{
missingIDs.add(id);
}
}
if (!missingIDs.isEmpty())
{
List<InternalCDORevision> missingRevisions = loadRevisions(missingIDs, referenceChunk);
handleMissingRevisions(revisions, missingRevisions);
}
return revisions;
}
public List<CDORevision> getRevisionsByTime(Collection<CDOID> ids, int referenceChunk, long timeStamp,
boolean loadMissingRevisions)
{
List<CDOID> missingIDs = loadMissingRevisions ? new ArrayList<CDOID>(0) : null;
List<CDORevision> revisions = new ArrayList<CDORevision>(ids.size());
for (CDOID id : ids)
{
InternalCDORevision revision = getRevisionByTime(id, referenceChunk, timeStamp, false);
revisions.add(revision);
if (revision == null && missingIDs != null)
{
missingIDs.add(id);
}
}
if (missingIDs != null && !missingIDs.isEmpty())
{
List<InternalCDORevision> missingRevisions = loadRevisionsByTime(missingIDs, referenceChunk, timeStamp);
handleMissingRevisions(revisions, missingRevisions);
}
return revisions;
}
public CDOID getResourceID(CDOID folderID, String name, long timeStamp)
{
return cache.getResourceID(folderID, name, timeStamp);
}
public List<CDORevision> getCachedRevisions()
{
return cache.getRevisions();
}
private void addCachedRevisionIfNotNull(InternalCDORevision revision)
{
if (revision != null)
{
cache.addRevision(revision);
}
}
public boolean addCachedRevision(InternalCDORevision revision)
{
if (revision != null)
{
return cache.addRevision(revision);
}
throw new IllegalArgumentException("revision == null");
}
public void removeCachedRevision(CDOID id, int version)
{
cache.removeRevision(id, version);
}
public void clearCache()
{
cache.clear();
}
protected InternalCDORevision verifyRevision(InternalCDORevision revision, int referenceChunk)
{
return revision;
}
protected abstract InternalCDORevision loadRevision(CDOID id, int referenceChunk);
protected abstract InternalCDORevision loadRevisionByTime(CDOID id, int referenceChunk, long timeStamp);
protected abstract InternalCDORevision loadRevisionByVersion(CDOID id, int referenceChunk, int version);
protected abstract List<InternalCDORevision> loadRevisions(Collection<CDOID> ids, int referenceChunk);
protected abstract List<InternalCDORevision> loadRevisionsByTime(Collection<CDOID> ids, int referenceChunk,
long timeStamp);
protected abstract CDOPackageManager getPackageManager();
@Override
protected void doBeforeActivate() throws Exception
{
super.doBeforeActivate();
if (cache == null)
{
cache = CDORevisionCacheUtil.createDefaultCache();
}
}
@Override
protected void doActivate() throws Exception
{
super.doActivate();
cache.setPackageManager(getPackageManager());
LifecycleUtil.activate(cache);
}
@Override
protected void doDeactivate() throws Exception
{
LifecycleUtil.deactivate(cache);
super.doDeactivate();
}
private void handleMissingRevisions(List<CDORevision> revisions, List<InternalCDORevision> missingRevisions)
{
Iterator<InternalCDORevision> it = missingRevisions.iterator();
for (int i = 0; i < revisions.size(); i++)
{
CDORevision revision = revisions.get(i);
if (revision == null)
{
InternalCDORevision missingRevision = it.next();
revisions.set(i, missingRevision);
addCachedRevisionIfNotNull(missingRevision);
}
}
}
}
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