| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2002 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Ant", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * 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 |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.tools.ant.util; |
| |
| import java.util.Enumeration; |
| import java.util.Vector; |
| |
| /** |
| * Generalization of <code>ExecuteWatchdog</code> |
| * |
| * @since Ant 1.5 |
| * |
| * @see org.apache.tools.ant.taskdefs.ExecuteWatchdog |
| * |
| * @author <a href="stefan.bodewig@epost.de">Stefan Bodewig</a> |
| * @author thomas.haas@softwired-inc.com |
| * @author <a href="mailto:sbailliez@imediation.com">Stephane Bailliez</a> |
| */ |
| public class Watchdog implements Runnable { |
| |
| private Vector observers = new Vector(1); |
| private long timeout = -1; |
| private boolean stopped = false; |
| |
| public Watchdog(long timeout) { |
| if (timeout < 1) { |
| throw new IllegalArgumentException("timeout lesser than 1."); |
| } |
| this.timeout = timeout; |
| } |
| |
| public void addTimeoutObserver(TimeoutObserver to) { |
| observers.addElement(to); |
| } |
| |
| public void removeTimeoutObserver(TimeoutObserver to) { |
| observers.removeElement(to); |
| } |
| |
| protected final void fireTimeoutOccured() { |
| Enumeration enum = observers.elements(); |
| while (enum.hasMoreElements()) { |
| ((TimeoutObserver) enum.nextElement()).timeoutOccured(this); |
| } |
| } |
| |
| public synchronized void start() { |
| stopped = false; |
| Thread t = new Thread(this, "WATCHDOG"); |
| t.setDaemon(true); |
| t.start(); |
| } |
| |
| public synchronized void stop() { |
| stopped = true; |
| notifyAll(); |
| } |
| |
| public synchronized void run() { |
| final long until = System.currentTimeMillis() + timeout; |
| long now; |
| while (!stopped && until > (now = System.currentTimeMillis())) { |
| try { |
| wait(until - now); |
| } catch (InterruptedException e) {} |
| } |
| if (!stopped) { |
| fireTimeoutOccured(); |
| } |
| } |
| |
| } |