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 * Implements the same behavior as {@link 019 * java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy}. 020 * 021 * @author Shuyang Zhou 022 * @see java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy 023 */ 024 public class DiscardOldestPolicy implements RejectedExecutionHandler { 025 026 /** 027 * @see java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy#rejectedExecution( 028 * Runnable, java.util.concurrent.ThreadPoolExecutor) 029 */ 030 @Override 031 public void rejectedExecution( 032 Runnable runnable, ThreadPoolExecutor threadPoolExecutor) { 033 034 if (threadPoolExecutor.isShutdown()) { 035 return; 036 } 037 038 TaskQueue<Runnable> taskQueue = threadPoolExecutor.getTaskQueue(); 039 040 taskQueue.poll(); 041 042 threadPoolExecutor.execute(runnable); 043 } 044 045 }