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/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/util/TimeoutController.java,v 1.4.2.1 2004/02/22 18:21:16 olegk Exp $
 * $Revision: 1.4.2.1 $
 * $Date: 2004/02/22 18:21:16 $
 *
 * ====================================================================
 *
 *  Copyright 1999-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient.util;

/**
 * 

* Executes a task with a specified timeout. *

* @author Ortwin Glück * @author Mike Bowler * @version $Revision: 1.4.2.1 $ * @since 2.0 */ public final class TimeoutController { /** * Do not instantiate objects of this class. Methods are static. */ private TimeoutController() { } /** * Executes task. Waits for timeout * milliseconds for the task to end and returns. If the task does not return * in time, the thread is interrupted and an Exception is thrown. * The caller should override the Thread.interrupt() method to something that * quickly makes the thread die or use Thread.isInterrupted(). * @param task The thread to execute * @param timeout The timeout in milliseconds. 0 means to wait forever. * @throws TimeoutException if the timeout passes and the thread does not return. */ public static void execute(Thread task, long timeout) throws TimeoutException { task.start(); try { task.join(timeout); } catch (InterruptedException e) { /* if somebody interrupts us he knows what he is doing */ } if (task.isAlive()) { task.interrupt(); throw new TimeoutException(); } } /** * Executes task in a new deamon Thread and waits for the timeout. * @param task The task to execute * @param timeout The timeout in milliseconds. 0 means to wait forever. * @throws TimeoutException if the timeout passes and the thread does not return. */ public static void execute(Runnable task, long timeout) throws TimeoutException { Thread t = new Thread(task, "Timeout guard"); t.setDaemon(true); execute(t, timeout); } /** * Signals that the task timed out. */ public static class TimeoutException extends Exception { /** Create an instance */ public TimeoutException() { } } }


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