com.liferay.portal.kernel.concurrent.DiscardOldestPolicy Maven / Gradle / Ivy

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Contains interfaces for the portal services. Interfaces are only loaded by the global class loader and are shared by all plugins.

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/**
 * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.concurrent;

/**
 * Implements the same behavior as {@link
 * java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy}.
 *
 * @author Shuyang Zhou
 * @see    java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy
 */
public class DiscardOldestPolicy implements RejectedExecutionHandler {

	/**
	 * @see java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy#rejectedExecution(
	 *      Runnable, java.util.concurrent.ThreadPoolExecutor)
	 */
	@Override
	public void rejectedExecution(
		Runnable runnable, ThreadPoolExecutor threadPoolExecutor) {

		if (threadPoolExecutor.isShutdown()) {
			return;
		}

		TaskQueue taskQueue = threadPoolExecutor.getTaskQueue();

		taskQueue.poll();

		threadPoolExecutor.execute(runnable);
	}

}