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/*
* Copyright (c) 2011, 2012, 2014, 2015 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:
* Caspar De Groot - initial API and implementation
*/
package org.eclipse.emf.cdo.server.internal.net4j.protocol;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDUtil;
import org.eclipse.emf.cdo.common.lock.CDOLockState;
import org.eclipse.emf.cdo.common.lock.CDOLockUtil;
import org.eclipse.emf.cdo.common.model.CDOClassInfo;
import org.eclipse.emf.cdo.common.protocol.CDODataInput;
import org.eclipse.emf.cdo.common.protocol.CDODataOutput;
import org.eclipse.emf.cdo.common.protocol.CDOProtocolConstants;
import org.eclipse.emf.cdo.server.IView;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.emf.cdo.spi.server.InternalLockManager;
import org.eclipse.emf.cdo.spi.server.InternalView;
import org.eclipse.net4j.util.concurrent.RWOLockManager.LockState;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
/**
* @author Caspar De Groot
*/
public class LockStateIndication extends CDOServerReadIndication
{
private Collection<CDOLockState> existingLockStates;
private int prefetchDepth = CDOLockState.DEPTH_NONE;
public LockStateIndication(CDOServerProtocol protocol)
{
super(protocol, CDOProtocolConstants.SIGNAL_LOCK_STATE);
}
@Override
protected void indicating(CDODataInput in) throws IOException
{
int viewID = in.readInt();
InternalView view = getSession().getView(viewID);
if (view == null)
{
throw new IllegalStateException("View not found");
}
InternalLockManager lockManager = getRepository().getLockingManager();
existingLockStates = new ArrayList<CDOLockState>();
int n = in.readInt();
if (n < 0)
{
n = -n;
prefetchDepth = in.readInt();
}
if (n == 0)
{
Collection<LockState<Object, IView>> lockStates = lockManager.getLockStates();
for (LockState<Object, IView> lockState : lockStates)
{
existingLockStates.add(CDOLockUtil.createLockState(lockState));
}
}
else
{
for (int i = 0; i < n; i++)
{
CDOID id = in.readCDOID();
prefetchLockStates(prefetchDepth >= CDOLockState.DEPTH_NONE ? prefetchDepth : Integer.MAX_VALUE, id, view);
}
}
}
private void prefetchLockStates(int depth, CDOID id, InternalView view)
{
addLockState(id, view);
if (depth > CDOLockState.DEPTH_NONE)
{
--depth;
InternalCDORevision revision = (InternalCDORevision)view.getRevision(id);
CDOClassInfo classInfo = revision.getClassInfo();
for (EStructuralFeature feature : classInfo.getAllPersistentFeatures())
{
if (feature instanceof EReference)
{
EReference reference = (EReference)feature;
if (reference.isContainment())
{
Object value = revision.getValue(reference);
if (value instanceof CDOID)
{
prefetchLockStates(depth, (CDOID)value, view);
}
else if (value instanceof Collection<?>)
{
Collection<?> c = (Collection<?>)value;
for (Object e : c)
{
// If this revision was loaded with referenceChunk != UNCHUNKED,
// then some elements might be uninitialized, i.e. not
// instanceof CDOID. (See bug 339313.)
if (e instanceof CDOID)
{
prefetchLockStates(depth, (CDOID)e, view);
}
}
}
}
}
}
}
}
private void addLockState(CDOID id, InternalView view)
{
Object key;
if (getRepository().isSupportingBranches())
{
key = CDOIDUtil.createIDAndBranch(id, view.getBranch());
}
else
{
key = id;
}
LockState<Object, IView> lockState = getRepository().getLockingManager().getLockState(key);
if (lockState != null)
{
existingLockStates.add(CDOLockUtil.createLockState(lockState));
}
}
@Override
protected void responding(CDODataOutput out) throws IOException
{
out.writeInt(existingLockStates.size());
for (CDOLockState lockState : existingLockStates)
{
out.writeCDOLockState(lockState);
}
}
}
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