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

    } catch (JMuleManagerException e) {
      e.printStackTrace();
      return;
    }
    _network_manager = (InternalNetworkManager) NetworkManagerSingleton.getInstance();
    need_more_peers_timer = new Timer( "Need more peers timer", true );
    need_more_peers_timer.scheduleAtFixedRate( new TimerTask() {
      @Override
      public void run() {
        Set<FileHash> file_hashes = session_list.keySet();
        List<FileHash> file_hashes_needed_help = new ArrayList<FileHash>();

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        }
        synchronized (this) {
            _accumulator += zoomIncrement;
            if (_zoomAccumulator != null)
                return;
            _zoomAccumulator = new Timer();
            _zoomAccumulator.schedule(new TimerTask() {
                public void run() {
                    int accuCopy;
                    synchronized (ViewTransform.this) {
                        accuCopy = _accumulator;

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      super.start();
    } catch (JMuleManagerException e) {
      e.printStackTrace();
      return ;
    }
    remove_temp_banned_peers_timer = new Timer( "Remove temp banned peers timer", true );
    remove_temp_banned_peers_timer.scheduleAtFixedRate(new TimerTask() {
      @Override
      public void run() {
        for(TemporaryBannedIP banned_ip : temporary_banned_peers) 
          if( ( System.currentTimeMillis() - banned_ip.getWhenBanned() ) >= banned_ip.getHowLong() )
            temporary_banned_peers.remove( banned_ip );
      }
    }, (long)1, REMOVE_TEMP_BANNED_PEERS_INTERVAL);
    
    remove_temp_banned_servers_timer = new Timer( "Remove temp banned servers timer", true);
    remove_temp_banned_servers_timer.scheduleAtFixedRate(new TimerTask() {
      @Override
      public void run() {
        for(TemporaryBannedIP banned_ip : temporary_banned_servers) 
          if( ( System.currentTimeMillis() - banned_ip.getWhenBanned() ) >= banned_ip.getHowLong() )

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            TimerTask task = new TimerTask() {
                public void run() {
                    getResendInitiator().run();
                }
            };
            timer = new Timer();
            timer.schedule(task, getBaseRetransmissionInterval(), getBaseRetransmissionInterval());  
        }
    }

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            destination = new RMDestination(this);
            destination.restore();
        }
        
        if (null == timer) {
            timer = new Timer();
        }
        
        if (!busLifeCycleListenerRegistered) {
            getBinding().getBus().getLifeCycleManager()
                .registerLifeCycleListener(new RMBusLifeCycleListener(getSource()));

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         // if there is a timer and no change about the refreshperiod, let it do its job
        if (_refreshPeriodChanged || _timer == null){
            _refreshPeriodChanged = false;
            if (_timer!=null) 
                _timer.cancel();
            _timer = new Timer(true); // do not block the application on exit
            _timer.schedule(new SceneTimerTask(),0,_refreshPeriod);
        }
    }

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      public void run() {
        interrupt();
      }
    };


    timer = new Timer("TimeLimitCursor", true);
    timer.schedule(tt, timeLimit);
  }

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    else if (syncDelay > 0L) {
      synchronized (syncTimerSemaphore) {
        // Sync in syncDelay milliseconds
        if (syncTimer == null) {
          // Create the syncTimer on a deamon thread
          syncTimer = new Timer("MemoryStore synchronization", true);
        }


        if (syncTimerTask != null) {
          logger.error("syncTimerTask is not null");
        }

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    }


  static public void main(String[] args) {
    Calendar c = Calendar.getInstance(); // contains current startup time
    //c.add(Calendar.SECOND, 30); // starting in 30 seconds
    Timer timer = new Timer();
    timer.schedule(new TestMetarEncoding(), c.getTime(), (long) 1000 * 120); // delay 2 min between runs
  }

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    }
  }


  // ÿ�����ϰ�ҹʱ���Զ�����
  private void manager() {
    Timer timer = new Timer();
    TimerTask tt2 = new TimerTask() {
      public void run() {
        loadNewWords();
      }
    };


    Date date = Config.update_keys_time();
    timer.schedule(tt2, date, Config.update_keys_interval() * 60000);


  }

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