threadpoolexecutoradapter.java

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//========================================================================
//$$Id: ThreadPoolExecutorAdapter.java,v 1.3 2007/11/02 12:39:41 ludovic_orban Exp $$
//
//------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at 
//http://www.apache.org/licenses/LICENSE-2.0
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//========================================================================

package org.mortbay.jetty.j2se6;

import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.mortbay.component.LifeCycle;
import org.mortbay.log.Log;
import org.mortbay.thread.ThreadPool;

/**
 * Jetty {@link ThreadPool} that bridges requests to a {@link ThreadPoolExecutor}.
 * @author lorban
 */
public class ThreadPoolExecutorAdapter implements ThreadPool, LifeCycle
{
	
	private ThreadPoolExecutor executor;
	
	public ThreadPoolExecutorAdapter(ThreadPoolExecutor executor)
	{
		this.executor = executor;
	}

	public boolean dispatch(Runnable job)
	{
		try
        {       
			executor.execute(job);
            return true;
        }
        catch(RejectedExecutionException e)
        {
            Log.warn(e);
            return false;
        }
	}

	public int getIdleThreads()
	{
		return executor.getPoolSize()-executor.getActiveCount();
	}

	public int getThreads()
	{
		return executor.getPoolSize();
	}

	public boolean isLowOnThreads()
	{
		return executor.getActiveCount()>=executor.getMaximumPoolSize();
	}

	public void join() throws InterruptedException
	{
		executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
	}

	
	
	public boolean isFailed()
	{
		return false;
	}

	public boolean isRunning()
	{
		return !executor.isTerminated() && !executor.isTerminating();
	}

	public boolean isStarted()
	{
		return !executor.isTerminated() && !executor.isTerminating();
	}

	public boolean isStarting()
	{
		return false;
	}

	public boolean isStopped()
	{
		return executor.isTerminated();
	}

	public boolean isStopping()
	{
		return executor.isTerminating();
	}

	public void start() throws Exception
	{
		if (executor.isTerminated() || executor.isTerminating() || executor.isShutdown())
            throw new IllegalStateException("Cannot restart");
	}

	public void stop() throws Exception
	{
		executor.shutdown();
        if (!executor.awaitTermination(60,TimeUnit.SECONDS))
        	executor.shutdownNow();
	}

}