001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.concurrent;
016    
017    /**
018     * @author Shuyang Zhou
019     */
020    public class DiscardOldestPolicy implements RejectedExecutionHandler {
021    
022            @Override
023            public void rejectedExecution(
024                    Runnable runnable, ThreadPoolExecutor threadPoolExecutor) {
025    
026                    if (threadPoolExecutor.isShutdown()) {
027                            return;
028                    }
029    
030                    TaskQueue<Runnable> taskQueue = threadPoolExecutor.getTaskQueue();
031    
032                    taskQueue.poll();
033    
034                    threadPoolExecutor.execute(runnable);
035            }
036    
037    }