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The source code/* * $Header: /cvsroot/mvnforum/myvietnam/src/net/myvietnam/mvncore/util/TimerUtil.java,v 1.10 2005/01/18 12:16:46 minhnn Exp $ * $Author: minhnn $ * $Revision: 1.10 $ * $Date: 2005/01/18 12:16:46 $ * * ==================================================================== * * Copyright (C) 2002-2005 by MyVietnam.net * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or any later version. * * All copyright notices regarding MyVietnam and MyVietnam CoreLib * MUST remain intact in the scripts and source code. * * 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Correspondence and Marketing Questions can be sent to: * info@MyVietnam.net * * @author: Minh Nguyen minhnn@MyVietnam.net * @author: Mai Nguyen mai.nh@MyVietnam.net */ package net.myvietnam.mvncore.util; import java.util.Timer; import java.util.TimerTask; import java.util.Date; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public final class TimerUtil { // static variable private static Log log = LogFactory.getLog(TimerUtil.class); // static variable private static TimerUtil instance = null; // static variable private static boolean isCanceled = false; // instance variables private Timer timer = null; // private constructor will prevent any instatiation private TimerUtil() { log.debug("TimerUtil is instantiated."); timer = new Timer(); } private void reloadTimer() { log.info("Reload Timer in TimerUtil."); if (!isCanceled) { timer.cancel(); // Cancel the errored timer timer = new Timer(); } } /** * This static method is used to get the Singleton instance of TimerUtil * @return the singleton instance of TimerUtil */ public static synchronized TimerUtil getInstance() { if (instance == null) { instance = new TimerUtil(); } return instance; } public void cancel() { isCanceled = true; timer.cancel(); } public void schedule(TimerTask task, Date firstTime, long period) { if (!isCanceled) { try { timer.schedule(task, firstTime, period); } catch (IllegalStateException ex) { log.error("Cannot schedule task!", ex); reloadTimer(); } } } public void schedule(TimerTask task, Date time) { if (!isCanceled) { try { timer.schedule(task, time); } catch (IllegalStateException ex) { log.error("Cannot schedule task!", ex); reloadTimer(); } } } public void schedule(TimerTask task, long delay) { if (!isCanceled) { try { timer.schedule(task, delay); } catch (IllegalStateException ex) { log.error("Cannot schedule task!", ex); reloadTimer(); } } } public void schedule(TimerTask task, long delay, long period) { if (!isCanceled) { try { timer.schedule(task, delay, period); } catch (IllegalStateException ex) { log.error("Cannot schedule task!", ex); reloadTimer(); } } } public void scheduleAtFixedRate(TimerTask task, Date firstTime, long period) { if (!isCanceled) { try { timer.schedule(task, firstTime, period); } catch (IllegalStateException ex) { log.error("Cannot schedule task!", ex); reloadTimer(); } } } public void scheduleAtFixedRate(TimerTask task, long delay, long period) { if (!isCanceled) { try { timer.schedule(task, delay, period); } catch (IllegalStateException ex) { log.error("Cannot schedule task!", ex); reloadTimer(); } } } } |
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