001 /** 002 * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved. 003 * 004 * The contents of this file are subject to the terms of the Liferay Enterprise 005 * Subscription License ("License"). You may not use this file except in 006 * compliance with the License. You can obtain a copy of the License by 007 * contacting Liferay, Inc. See the License for the specific language governing 008 * permissions and limitations under the License, including but not limited to 009 * distribution rights of the Software. 010 * 011 * 012 * 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 }