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/*
 * @(#)MQTimer.java	1.12 06/29/07
 */ 

package com.sun.messaging.jmq.util.timer;


import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import com.sun.messaging.jmq.util.log.*;
import com.sun.messaging.jmq.resources.*;

public class MQTimer extends java.util.Timer {

    private static boolean DEBUG = false;

    private static SharedResources myrb = SharedResources.getResources();
    private static Logger logger = null;

    public static void setLogger(Logger l) {
        logger = l;
		if (l.getLevel() <= Logger.DEBUG) DEBUG = true;
    }

    /**
     * This object causes the timer's task execution thread to exit
     * gracefully when there are no live references to the Timer object and no
     * tasks in the timer queue.  It is used in preference to a finalizer on
     * Timer as such a finalizer would be susceptible to a subclass's
     * finalizer forgetting to call it.
     */
    private Object mqTimerObject = new Object() {
        protected void finalize() throws Throwable {
            if (DEBUG && logger != null) {
                Exception ex = new RuntimeException("MQTimer.mqtimerObject: finalize");
                ex.fillInStackTrace();
                logger.logStack(Logger.INFO,  "Internal Error: timer canceled ", ex);
            }
        }
    };

    public MQTimer() {
        this(false);
    }

    public MQTimer(boolean isDaemon) {
        super("MQTimer-Thread", isDaemon);
    }

    public void initUncaughtExceptionHandler() {
        TimerTask uehtask = new TimerTask() {
           public void run() {
               Thread thr = Thread.currentThread();
               Thread.UncaughtExceptionHandler ueh = thr.getUncaughtExceptionHandler();
               try {
                   thr.setUncaughtExceptionHandler(new MQTimerUncaughtExceptionHandler(ueh));
               } catch (Exception e) {
                   if (logger != null) {
                       logger.log(Logger.WARNING, 
                              myrb.getKString(myrb.W_SET_UNCAUGHT_EX_HANDLER_FAIL,
                              getClass().getName()));
                   }
               }
               cancel();
               
           }
        };
        try {
            schedule(uehtask, new Date());
        } catch (Exception ex) {
            if (logger != null) {
                logger.log(Logger.WARNING, 
                       myrb.getKString(myrb.W_SCHEDULE_UNCAUGHT_EX_HANDLER_TASK_FAIL,
                                       ex.getMessage()));
            }
        }
    } 

    class MQTimerUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler { 
        Thread.UncaughtExceptionHandler parent = null;

        public MQTimerUncaughtExceptionHandler(Thread.UncaughtExceptionHandler parent) {
            this.parent = parent;
        }
    
        public void uncaughtException(Thread t, Throwable e) { 
            if (logger != null) {
                logger.logStack(Logger.ERROR, 
                       myrb.getKString(myrb.E_UNCAUGHT_EX_IN_THREAD, 
                                       e.getMessage(), t.getName()), e);
            }
            parent.uncaughtException(t, e);
        }
    }

    public void cancel() {
        super.cancel();
        if (logger != null && (DEBUG || logger.getLevel() < Logger.DEBUG)) {
            Exception ex = new RuntimeException("MQTimer: cancel");
            ex.fillInStackTrace();
            logger.logStack(Logger.INFO, "Internal Error: timer canceled ", ex);
        }
    }
}
