Examples of java.util.Timer

java.util.Timer
A facility for threads to schedule tasks for future execution in a background thread. Tasks may be scheduled for one-time execution, or for repeated execution at regular intervals.
Corresponding to each Timer object is a single background thread that is used to execute all of the timer's tasks, sequentially. Timer tasks should complete quickly. If a timer task takes excessive time to complete, it "hogs" the timer's task execution thread. This can, in turn, delay the execution of subsequent tasks, which may "bunch up" and execute in rapid succession when (and if) the offending task finally completes.
After the last live reference to a Timer object goes away and all outstanding tasks have completed execution, the timer's task execution thread terminates gracefully (and becomes subject to garbage collection). However, this can take arbitrarily long to occur. By default, the task execution thread does not run as a daemon thread, so it is capable of keeping an application from terminating. If a caller wants to terminate a timer's task execution thread rapidly, the caller should invoke the timer's cancel method.
If the timer's task execution thread terminates unexpectedly, for example, because its stop method is invoked, any further attempt to schedule a task on the timer will result in an IllegalStateException, as if the timer's cancel method had been invoked.
This class is thread-safe: multiple threads can share a single Timer object without the need for external synchronization.
This class does not offer real-time guarantees: it schedules tasks using the Object.wait(long) method.
Implementation note: This class scales to large numbers of concurrently scheduled tasks (thousands should present no problem). Internally, it uses a binary heap to represent its task queue, so the cost to schedule a task is O(log n), where n is the number of concurrently scheduled tasks.
Implementation note: All constructors start a timer thread. @author Josh Bloch @version 1.19, 01/27/06 @see TimerTask @see Object#wait(long) @since 1.3

  }


  private class GarbageTask extends TimerTask {
    private GarbageTask() {
      if (NTransaction.this.timer == null)
        NTransaction.this.timer = new Timer();
      if (logFile.garbageTimeOut > 0) {
        try {
          NTransaction.this.timer.schedule(this, logFile.garbageTimeOut, logFile.garbageTimeOut);
        } catch (Exception exc) {
          logmon.log(BasicLevel.ERROR,

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   */
  protected void startTimer() {
    if (mRefreshListTimer != null) {
      mRefreshListTimer.cancel();
    }
    mRefreshListTimer = new Timer("Refresh channel list");
    mRefreshListTimer.schedule(new TimerTask() {
      public void run() {
        if (!mListUpdating) {
          mListUpdating = true;
          fillAvailableChannelsListBox();

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  /**
   * Returns a shared timer provided by the agent server.
   */
  public static synchronized final Timer getTimer() {
    if (timer == null) {
      timer = new Timer();
    }
    return timer;
  }

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    if (AgentServer.isHAServer() && !AgentServer.isMasterHAServer())
      return;


    if (period > 0) {
      try {
        Timer timer = AgentServer.getTimer();
        if (!schedule) {
          timer.schedule(this, period, period);
          schedule = true;
        }
      } catch (Exception exc) {
        if (logger.isLoggable(BasicLevel.WARN))
          logger.log(BasicLevel.WARN, "--- " + this, exc);

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    Log.set(Log.LEVEL_DEBUG);
  }


  protected void setUp () throws Exception {
    System.out.println("---- " + getClass().getSimpleName());
    timer = new Timer();
  }

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    {
      HttpSession session = request.getSession();
      UserObject userObject = (UserObject)session.getAttribute("userobject");
      
      int individualID = userObject.getIndividualID();    // logged in user
      Timer userTimer = siteInfo.getUserTimer(individualID);
      if (userTimer != null)
      {
        userTimer.cancel();
      }
      if (session != null) 
      {
        session.invalidate();
      }

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          // minutes to seconds, then seconds to miliseconds...
          Integer interval = new Integer(userInterval * 60 * 1000);
          
          // make sure this job isn't already scheduled for some unknown reason...
          // .. by "make sure", I mean blindly cancel the job registered for this user.
          Timer currentTimer = siteInfo.getUserTimer(individualId);
          if (currentTimer != null) {
            currentTimer.cancel();
          }


          TimerTask currentTask = siteInfo.getUserTask(individualId);
          if (currentTask != null) {
            currentTask.cancel();
          }


          Timer newTimer = new Timer(true);
          TimerTask userEmailCheck = new UserEmailCheck(individualId, session, dataSource, host);
          newTimer.schedule(userEmailCheck, 300000L, interval.longValue());
          siteInfo.setUserTimer(individualId, newTimer, userEmailCheck);
        }


        // code added for concurrent user maintinance
        session.setAttribute(SessionAlive.IS_ALIVE, new SessionAlive());

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    public void start() throws ServiceException {
        if(perfmonIntervalnMills == -1 || !LOG.isInfoEnabled()) {
            return;
        }
        PerfmonTask task = new PerfmonTask();
        Timer timer = new Timer(SRV_NAME, true);
        timer.scheduleAtFixedRate(task, 1000, perfmonIntervalnMills);
        this._timer = timer;
        this._status = Status.started;
    }

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    private final Timer _sweepTimer;


    public ConcurrentKeyedStackObjectPool(String sweepThreadName, PoolableObjectFactory<K, V> factory) {
        this._factory = factory;
        this._poolMap = ConcurrentCollectionProvider.createConcurrentMap(8);
        this._sweepTimer = new Timer("ObjPoolExpirer#" + sweepThreadName, true);
        _sweepTimer.scheduleAtFixedRate(new Expirer(factory.geTimeToLive()), 3000, factory.getSweepInterval());
    }

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                public void run() {
                    System.err.println("Execution Timeout: " + sw.toString());
                    System.exit(1);
                }
            };
            Timer timer = new Timer();
            timer.schedule(cancel, timeout * 1000);
            try {
                execute(reader);
            } catch (XQueryException e) {
                timer.cancel();
                throw e;
            }
            timer.cancel();
        } else {
            execute(reader);
        }
        if(_timing) {
            if(_timing_in_msec) {

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