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/*
 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2007-2010 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
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 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
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package org.jvnet.hk2.component.concurrent;

import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * An executor service managing a pool of threads with a low and
 * high bounds for active, cached threads.  After inactivity, threads
 * are terminated. 
 *
 * 
 * If threads are busy, work happens on caller's thread.
 * 
 * @author Jeff Trent
 */
@SuppressWarnings("unchecked")
public class Hk2Executor extends ThreadPoolExecutor {

  public static final long KEEP_ALIVE = 20;
  
  public Hk2Executor(int corePoolSize, int maxPoolSize) {
    super(corePoolSize, maxPoolSize,
        KEEP_ALIVE, TimeUnit.SECONDS,
        new SynchronousQueue(),
        new ThreadPoolExecutor.CallerRunsPolicy());
    prestartAllCoreThreads();
  }
  
  public Hk2Executor(int corePoolSize, int maxPoolSize, ThreadFactory threadFactory) {
    super(corePoolSize, maxPoolSize,
        KEEP_ALIVE, TimeUnit.SECONDS,
        new SynchronousQueue(),
        threadFactory, new ThreadPoolExecutor.CallerRunsPolicy());
    prestartAllCoreThreads();
  }

}