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/**
* Copyright (c) 2004 - 2011 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:
* Simon McDuff - initial API and implementation
* Eike Stepper - maintenance
*/
package org.eclipse.emf.internal.cdo.object;
import org.eclipse.emf.cdo.CDOLock;
import org.eclipse.emf.cdo.common.lock.CDOLockOwner;
import org.eclipse.emf.cdo.common.lock.CDOLockUtil;
import org.eclipse.emf.cdo.util.LockTimeoutException;
import org.eclipse.net4j.util.WrappedException;
import org.eclipse.net4j.util.concurrent.IRWLockManager.LockType;
import org.eclipse.emf.spi.cdo.InternalCDOObject;
import java.text.MessageFormat;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.locks.Condition;
/**
* @author Simon McDuff
* @since 4.0
*/
public class CDOLockImpl implements CDOLock
{
public static final CDOLock NOOP = new NOOPLockImpl();
private final InternalCDOObject object;
private final LockType type;
private final CDOLockOwner owner;
public CDOLockImpl(InternalCDOObject object, LockType type)
{
this.object = object;
this.type = type;
owner = CDOLockUtil.createLockOwner(object.cdoView());
}
public LockType getType()
{
return type;
}
public boolean isLocked()
{
return object.cdoLockState().isLocked(type, owner, false);
}
/**
* @see org.eclipse.emf.cdo.CDOLock#isLockedByOthers()
*/
public boolean isLockedByOthers()
{
return object.cdoLockState().isLocked(type, owner, true);
}
public void lock()
{
try
{
object.cdoView().lockObjects(Collections.singletonList(object), type, WAIT);
}
catch (InterruptedException ex)
{
throw WrappedException.wrap(ex);
}
}
public void lock(long time, TimeUnit unit) throws TimeoutException
{
try
{
if (!tryLock(time, unit))
{
throw new TimeoutException();
}
}
catch (InterruptedException ex)
{
throw WrappedException.wrap(ex);
}
}
public void lock(long millis) throws TimeoutException
{
lock(millis, TimeUnit.MILLISECONDS);
}
public boolean tryLock(long millis) throws InterruptedException
{
return tryLock(millis, TimeUnit.MILLISECONDS);
}
public void lockInterruptibly() throws InterruptedException
{
lock();
}
public Condition newCondition()
{
throw new UnsupportedOperationException();
}
public boolean tryLock()
{
try
{
object.cdoView().lockObjects(Collections.singletonList(object), type, NO_WAIT);
return true;
}
catch (LockTimeoutException ex)
{
return false;
}
catch (InterruptedException ex)
{
throw WrappedException.wrap(ex);
}
}
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException
{
try
{
object.cdoView().lockObjects(Collections.singletonList(object), type, unit.toMillis(time));
return true;
}
catch (LockTimeoutException ex)
{
return false;
}
}
public void unlock()
{
object.cdoView().unlockObjects(Collections.singletonList(object), type);
}
@Override
public String toString()
{
return MessageFormat.format("CDOLock[object={0}, type={1}]", object, type);
}
/**
* @author Simon McDuff
*/
public static final class NOOPLockImpl implements CDOLock
{
private NOOPLockImpl()
{
}
public boolean isLocked()
{
return false;
}
/**
* @see org.eclipse.emf.cdo.CDOLock#isLockedByOthers()
*/
public boolean isLockedByOthers()
{
return false;
}
public void lock()
{
throw new UnsupportedOperationException();
}
public void lockInterruptibly() throws InterruptedException
{
throw new UnsupportedOperationException();
}
public Condition newCondition()
{
return null;
}
public void lock(long time, TimeUnit unit) throws TimeoutException
{
throw new UnsupportedOperationException();
}
public void lock(long millis) throws TimeoutException
{
throw new UnsupportedOperationException();
}
public boolean tryLock(long millis) throws InterruptedException
{
return false;
}
public boolean tryLock()
{
return false;
}
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException
{
return false;
}
public void unlock()
{
throw new UnsupportedOperationException();
}
public LockType getType()
{
return null;
}
}
}
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