com.liferay.portal.kernel.util.ClearTimerThreadUtil 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.util;

import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 * @author Shuyang Zhou
 */
public class ClearTimerThreadUtil {

	public static void clearTimerThread() throws Exception {
		if (!_initialized) {
			return;
		}

		Thread[] threads = ThreadUtil.getThreads();

		for (Thread thread : threads) {
			if (thread == null) {
				continue;
			}

			Class threadClass = thread.getClass();

			String threadClassName = threadClass.getName();

			if (!threadClassName.equals("java.util.TimerThread")) {
				continue;
			}

			Object queue = _queueField.get(thread);

			synchronized (queue) {
				_newTasksMayBeScheduledField.setBoolean(thread, false);

				_clearMethod.invoke(queue);

				queue.notify();
			}
		}
	}

	private static Log _log = LogFactoryUtil.getLog(ClearTimerThreadUtil.class);

	private static Method _clearMethod;
	private static boolean _initialized;
	private static Field _newTasksMayBeScheduledField;
	private static Field _queueField;

	static {
		try {
			Class timeThreadClass = Class.forName("java.util.TimerThread");

			_newTasksMayBeScheduledField = ReflectionUtil.getDeclaredField(
				timeThreadClass, "newTasksMayBeScheduled");
			_queueField = ReflectionUtil.getDeclaredField(
				timeThreadClass, "queue");

			Class taskQueueClass = Class.forName("java.util.TaskQueue");

			_clearMethod = ReflectionUtil.getDeclaredMethod(
				taskQueueClass, "clear");

			_initialized = true;
		}
		catch (Throwable t) {
			_initialized = false;

			if (_log.isWarnEnabled()) {
				_log.warn("Failed to initialize ClearTimerThreadUtil");
			}
		}
	}

}