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/*
* Copyright (c) 2008, 2009, 2011-2013, 2015, 2016 Eike Stepper (Loehne, 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
* Martin Taal - Implementation
*/
package org.eclipse.emf.cdo.server.internal.hibernate;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.revision.CDOList;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.server.hibernate.IHibernateStoreChunkReader;
import org.eclipse.emf.cdo.server.internal.hibernate.tuplizer.WrappedHibernateList;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.emf.cdo.spi.server.StoreChunkReader;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.CollectionEntry;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.persister.collection.QueryableCollection;
import java.util.List;
/**
* @author Eike Stepper
*/
public class HibernateStoreChunkReader extends StoreChunkReader implements IHibernateStoreChunkReader
{
public HibernateStoreChunkReader(HibernateStoreAccessor accessor, CDORevision revision, EStructuralFeature feature)
{
super(accessor, revision, feature);
}
@Override
public HibernateStoreAccessor getAccessor()
{
return (HibernateStoreAccessor)super.getAccessor();
}
public List<Chunk> executeRead()
{
// get a transaction, the hibernateStoreAccessor is placed in a threadlocal
// so all db access uses the same session.
final Session session = getAccessor().getHibernateSession();
// reread the revision as it is probably unreferenced
final InternalCDORevision latestRevision = getLatestRevision(session);
Object value = latestRevision.getValue(getFeature());
if (value instanceof WrappedHibernateList)
{
value = ((WrappedHibernateList)value).getDelegate();
}
// hibernate details...
boolean useExtraLazyMode = false;
boolean standardCDOList = false;
QueryableCollection persister = null;
CollectionEntry entry = null;
if (value instanceof PersistentCollection)
{
final PersistentCollection persistentCollection = (PersistentCollection)value;
persister = (QueryableCollection)((SessionFactoryImplementor)session.getSessionFactory()).getCollectionPersister(persistentCollection.getRole());
entry = ((SessionImplementor)session).getPersistenceContext().getCollectionEntry(persistentCollection);
useExtraLazyMode = !persister.getElementType().isEntityType();
if (useExtraLazyMode && ((PersistentCollection)value).hasQueuedOperations())
{
session.flush();
}
}
else
{
standardCDOList = true;
}
final List<Chunk> chunks = getChunks();
for (Chunk chunk : chunks)
{
final int startIndex = chunk.getStartIndex();
final int maxElements = chunk.size();
if (standardCDOList)
{
// for eattributes just read them all, no chunking there...
final CDOList list = (CDOList)value;
if (startIndex >= list.size())
{
return chunks;
}
for (int i = startIndex; i < startIndex + maxElements; i++)
{
if (i >= list.size())
{
break;
}
addToChunk(chunk, i - startIndex, list.get(i));
}
}
else if (useExtraLazyMode)
{
if (getFeature() instanceof EReference)
{
for (int i = startIndex; i < startIndex + maxElements; i++)
{
final Object object = persister.getElementByIndex(entry.getLoadedKey(), i, (SessionImplementor)session, latestRevision);
// could happen if the index > size)
if (object == null)
{
continue;
}
addToChunk(chunk, i - startIndex, object);
}
}
else
{
// for eattributes just read them all, no chunking there...
final List<?> list = (List<?>)value;
if (startIndex >= list.size())
{
return chunks;
}
for (int i = startIndex; i < startIndex + maxElements; i++)
{
if (i >= list.size())
{
break;
}
addToChunk(chunk, i - startIndex, list.get(i));
}
}
}
else
{
final Query filterQuery = session.createFilter(value, "");
filterQuery.setMaxResults(maxElements);
filterQuery.setFirstResult(startIndex);
int i = 0;
for (Object object : filterQuery.list())
{
addToChunk(chunk, i++, object);
}
}
}
return chunks;
}
private InternalCDORevision getLatestRevision(Session session)
{
final CDOID id = getRevision().getID();
final HibernateStore store = getAccessor().getStore();
if (store.isAuditing() && store.getHibernateAuditHandler().getCDOAuditHandler().isAudited(id))
{
InternalCDORevision revision = store.getHibernateAuditHandler().readRevision(session, id, getRevision().getTimeStamp());
// found one, use it
if (revision != null)
{
return revision;
}
}
return HibernateUtil.getInstance().getCDORevision(id);
}
private void addToRevisionCache(Object revision)
{
final InternalCDORevision internalRevision = (InternalCDORevision)revision;
for (EStructuralFeature feature : internalRevision.getEClass().getEAllStructuralFeatures())
{
if (!isMappedFeature(internalRevision, feature))
{
continue;
}
if (feature.isMany() || feature instanceof EReference)
{
final Object value = internalRevision.getValue(feature);
if (value instanceof WrappedHibernateList)
{
// force the size to be cached
((WrappedHibernateList)value).size();
}
}
}
getAccessor().addToRevisionCache(revision);
}
private void addToChunk(Chunk chunk, int i, Object object)
{
if (object instanceof CDORevision)
{
addToRevisionCache(object);
chunk.add(i, HibernateUtil.getInstance().getCDOID(object));
}
else
{
chunk.add(i, object);
}
}
private boolean isMappedFeature(InternalCDORevision revision, EStructuralFeature feature)
{
try
{
int featureID = revision.getClassInfo().getEClass().getFeatureID(feature);
revision.getClassInfo().getPersistentFeatureIndex(featureID);
return true;
}
catch (IllegalArgumentException ex)
{
return false;
}
catch (ArrayIndexOutOfBoundsException ex)
{
return false;
}
}
}
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