package org.eclipse.jetty.http.spi;
   
   //========================================================================
   //Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
   //------------------------------------------------------------------------
   //All rights reserved. This program and the accompanying materials
   //are made available under the terms of the Eclipse Public License v1.0
   //and Apache License v2.0 which accompanies this distribution.
   //The Eclipse Public License is available at 
  //http://www.eclipse.org/legal/epl-v10.html
  //The Apache License v2.0 is available at
  //http://www.opensource.org/licenses/apache2.0.php
  //You may elect to redistribute this code under either of these licenses. 
  //========================================================================
  
  import java.util.concurrent.RejectedExecutionException;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  
  import org.eclipse.jetty.util.component.AbstractLifeCycle;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  import org.eclipse.jetty.util.thread.ThreadPool;
  
  /**
   * Jetty {@link ThreadPool} that bridges requests to a {@link ThreadPoolExecutor}.
   */
  public class ThreadPoolExecutorAdapter extends AbstractLifeCycle implements ThreadPool
  {
      private static final Logger LOG = Log.getLogger(ThreadPoolExecutorAdapter.class);
  
  	
  	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();
 	}
 
 	protected void doStart() throws Exception
 	{
 		if (executor.isTerminated() || executor.isTerminating() || executor.isShutdown())
             throw new IllegalStateException("Cannot restart");
 	}
 
 	protected void doStop() throws Exception
 	{
 		executor.shutdown();
         if (!executor.awaitTermination(60, TimeUnit.SECONDS))
         	executor.shutdownNow();
 	}
 
 }