/*
* JBoss, Home of Professional Open Source.
* Copyright 2000 - 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.cache.util.concurrent;
import org.jboss.cache.CacheException;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* An executor that works within the current thread.
*
* @author Manik Surtani (<a href="mailto:manik AT jboss DOT org">manik AT jboss DOT org</a>)
* @see <a href="http://jcip.net/">Java Concurrency In Practice</a>
* @since 3.0
*/
public class WithinThreadExecutor implements ExecutorService
{
boolean shutDown = false;
public void execute(Runnable command)
{
command.run();
}
public void shutdown()
{
shutDown = true;
}
public List<Runnable> shutdownNow()
{
shutDown = true;
return Collections.emptyList();
}
public boolean isShutdown()
{
return shutDown;
}
public boolean isTerminated()
{
return shutDown;
}
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException
{
return shutDown;
}
public <T> Future<T> submit(Callable<T> task)
{
try
{
final T resp = task.call();
return new Future<T>()
{
public boolean cancel(boolean mayInterruptIfRunning)
{
return false;
}
public boolean isCancelled()
{
return false;
}
public boolean isDone()
{
return true;
}
public T get() throws InterruptedException, ExecutionException
{
return resp;
}
public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
{
return resp;
}
};
}
catch (Exception e)
{
throw new CacheException(e);
}
}
public <T> Future<T> submit(Runnable task, T result)
{
throw new UnsupportedOperationException();
}
public Future<?> submit(Runnable task)
{
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
// unchecked on purpose due to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6267833
public List invokeAll(Collection tasks) throws InterruptedException
{
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
// unchecked on purpose due to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6267833
public List invokeAll(Collection tasks, long timeout, TimeUnit unit) throws InterruptedException
{
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
// unchecked on purpose due to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6267833
public Object invokeAny(Collection tasks) throws InterruptedException, ExecutionException
{
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
// unchecked on purpose due to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6267833
public Object invokeAny(Collection tasks, long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
{
throw new UnsupportedOperationException();
}
}