CommonUtil.java

//  ---------------------------------------------------------------------------
//  jWebSocket - EventsPlugIn
//  Copyright (c) 2010 Innotrade GmbH, jWebSocket.org
//  ---------------------------------------------------------------------------
//  This program 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 3 of the License, or (at your
//  option) any later version.
//  This program 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.
//  You should have received a copy of the GNU Lesser General Public License along
//  with this program; if not, see <http://www.gnu.org/licenses/lgpl.html>.
//  ---------------------------------------------------------------------------
package org.jwebsocket.eventmodel.util;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

/**
 *
 * @author kyberneees
 */
public class CommonUtil {

	/**
	 * 
	 * @param pool
	 * @param allowedTime
	 * @throws Exception
	 */
	public static void shutdownThreadPoolAndAwaitTermination(ExecutorService pool, int allowedTime) throws Exception {
		pool.shutdown(); // Disable new tasks from being submitted
		try {
			// Wait a while for existing tasks to terminate
			if (!pool.awaitTermination(allowedTime, TimeUnit.SECONDS)) {
				pool.shutdownNow(); // Cancel currently executing tasks
				// Wait a while for tasks to respond to being cancelled
				if (!pool.awaitTermination(allowedTime, TimeUnit.SECONDS)) {
					throw new Exception("Pool did not terminate!");
				}
			}
		} catch (InterruptedException ie) {
			// (Re-)Cancel if current thread also interrupted
			pool.shutdownNow();
			// Preserve interrupt status
			Thread.currentThread().interrupt();
			throw ie;
		}
	}
}