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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/213402
**************************************************************************/
package org.eclipse.emf.cdo.internal.server;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDTemp;
import org.eclipse.emf.cdo.common.model.CDOClass;
import org.eclipse.emf.cdo.common.model.CDOClassProxy;
import org.eclipse.emf.cdo.common.model.CDOFeature;
import org.eclipse.emf.cdo.common.model.CDOPackage;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.delta.CDORevisionDelta;
import org.eclipse.emf.cdo.internal.server.bundle.OM;
import org.eclipse.emf.cdo.server.ISession;
import org.eclipse.emf.cdo.server.IStoreAccessor;
import org.eclipse.emf.cdo.server.IView;
import org.eclipse.emf.cdo.server.IStoreWriter.CommitContext;
import org.eclipse.emf.cdo.spi.common.InternalCDOClass;
import org.eclipse.emf.cdo.spi.common.InternalCDORevision;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import java.util.ArrayList;
import java.util.List;
/**
* @author Eike Stepper
*/
public abstract class StoreAccessor extends Lifecycle implements IStoreAccessor
{
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG, StoreAccessor.class);
private List<CommitContext> commitContexts = new ArrayList<CommitContext>();
private Store store;
private Object context;
private boolean reader;
private StoreAccessor(Store store, Object context, boolean reader)
{
this.store = store;
this.context = context;
this.reader = reader;
}
protected StoreAccessor(Store store, ISession session)
{
this(store, session, true);
}
protected StoreAccessor(Store store, IView view)
{
this(store, view, false);
}
public Store getStore()
{
return store;
}
public boolean isReader()
{
return reader;
}
public ISession getSession()
{
if (context instanceof IView)
{
return ((IView)context).getSession();
}
return (ISession)context;
}
public IView getView()
{
if (context instanceof IView)
{
return (IView)context;
}
return null;
}
public InternalCDORevision verifyRevision(CDORevision revision)
{
return (InternalCDORevision)revision;
}
/**
* @since 2.0
*/
public void write(CommitContext context)
{
if (TRACER.isEnabled())
{
TRACER.format("Writing transaction: {0}", getView());
}
commitContexts.add(context);
writePackages(context.getNewPackages());
addIDMappings(context);
context.applyIDMappings();
writeRevisions(context.getNewObjects());
if (store.hasWriteDeltaSupport() && store.getRepository().isSupportingRevisionDeltas())
{
writeRevisionDeltas(context.getDirtyObjectDeltas());
}
else
{
writeRevisions(context.getDirtyObjects());
}
detachObjects(context.getDetachedObjects());
}
/**
* @since 2.0
*/
public void commit()
{
}
public void rollback(CommitContext commitContext)
{
}
public void rollback()
{
if (TRACER.isEnabled())
{
TRACER.format("Rolling back transaction: {0}", getView());
}
for (CommitContext commitContext : commitContexts)
{
rollback(commitContext);
}
}
public final void release()
{
store.releaseAccessor(this);
commitContexts.clear();
}
protected void addIDMappings(CommitContext context)
{
if (store instanceof LongIDStore)
{
LongIDStore longIDStore = (LongIDStore)getStore();
for (CDORevision revision : context.getNewObjects())
{
CDOIDTemp oldID = (CDOIDTemp)revision.getID();
CDOID newID = longIDStore.getNextCDOID();
if (newID == null || newID.isNull() || newID.isTemporary())
{
throw new IllegalStateException("newID=" + newID);
}
context.addIDMapping(oldID, newID);
}
}
}
protected void writePackages(CDOPackage... cdoPackages)
{
for (CDOPackage cdoPackage : cdoPackages)
{
writePackage(cdoPackage);
}
}
protected void writePackage(CDOPackage cdoPackage)
{
for (CDOClass cdoClass : cdoPackage.getClasses())
{
writeClass((InternalCDOClass)cdoClass);
}
}
protected void writeClass(InternalCDOClass cdoClass)
{
for (CDOClassProxy superType : cdoClass.getSuperTypeProxies())
{
writeSuperType(cdoClass, superType);
}
for (CDOFeature feature : cdoClass.getFeatures())
{
writeFeature(feature);
}
}
protected void writeSuperType(InternalCDOClass type, CDOClassProxy superType)
{
throw new UnsupportedOperationException();
}
protected void writeFeature(CDOFeature feature)
{
throw new UnsupportedOperationException();
}
protected void writeRevisions(CDORevision[] revisions)
{
for (CDORevision revision : revisions)
{
writeRevision(revision);
}
}
/**
* @since 2.0
*/
protected void detachObjects(CDOID[] detachedObjects)
{
for (CDOID id : detachedObjects)
{
detachObject(id);
}
}
protected void writeRevision(CDORevision revision)
{
throw new UnsupportedOperationException();
}
protected void writeRevisionDeltas(CDORevisionDelta[] revisionDeltas)
{
for (CDORevisionDelta revisionDelta : revisionDeltas)
{
writeRevisionDelta(revisionDelta);
}
}
protected void writeRevisionDelta(CDORevisionDelta revisionDelta)
{
throw new UnsupportedOperationException();
}
/**
* @since 2.0
*/
protected void detachObject(CDOID id)
{
throw new UnsupportedOperationException();
}
@Override
protected abstract void doActivate() throws Exception;
@Override
protected abstract void doDeactivate() throws Exception;
/**
* @since 2.0
*/
protected abstract void doPassivate() throws Exception;
/**
* @since 2.0
*/
protected abstract void doUnpassivate() throws Exception;
}
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