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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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.concurrent;
import org.eclipse.net4j.util.WrappedException;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* @author Eike Stepper
*/
public class RWLock extends ReentrantReadWriteLock
{
private static final long serialVersionUID = 1L;
private long timeoutMillis;
public RWLock(long timeoutMillis)
{
this.timeoutMillis = timeoutMillis;
}
public RWLock(long timeoutMillis, boolean fair)
{
super(fair);
this.timeoutMillis = timeoutMillis;
}
public <V> V read(Callable<V> callable)
{
return call(callable, readLock(), timeoutMillis);
}
public void read(Runnable runnable)
{
run(runnable, readLock(), timeoutMillis);
}
public <V> V write(Callable<V> callable)
{
return call(callable, writeLock(), timeoutMillis);
}
public void write(Runnable runnable)
{
run(runnable, writeLock(), timeoutMillis);
}
public static <V> V call(Callable<V> callable, Lock lock, long timeoutMillis)
{
try
{
boolean locked = lock.tryLock(timeoutMillis, TimeUnit.MILLISECONDS);
if (locked)
{
try
{
return callable.call();
}
finally
{
lock.unlock();
}
}
throw new TimeoutException("Acquisition of lock timed out after " + timeoutMillis + " millis"); //$NON-NLS-1$ //$NON-NLS-2$
}
catch (Exception ex)
{
throw WrappedException.wrap(ex);
}
}
public static void run(Runnable runnable, Lock lock, long timeoutMillis)
{
try
{
boolean locked = lock.tryLock(timeoutMillis, TimeUnit.MILLISECONDS);
if (locked)
{
try
{
runnable.run();
}
finally
{
lock.unlock();
}
}
else
{
throw new TimeoutException("Acquisition of lock timed out after " + timeoutMillis + " millis"); //$NON-NLS-1$ //$NON-NLS-2$
}
}
catch (Exception ex)
{
throw WrappedException.wrap(ex);
}
}
}
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