001    /**
002     * Copyright (c) 2000-2011 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     * @author Shuyang Zhou
019     */
020    public class DiscardOldestPolicy implements RejectedExecutionHandler {
021    
022            public void rejectedExecution(
023                    Runnable runnable, ThreadPoolExecutor threadPoolExecutor) {
024    
025                    if (threadPoolExecutor.isShutdown()) {
026                            return;
027                    }
028    
029                    TaskQueue<Runnable> taskQueue = threadPoolExecutor.getTaskQueue();
030    
031                    taskQueue.poll();
032    
033                    threadPoolExecutor.execute(runnable);
034            }
035    
036    }