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

    // This is where we instanciate a java.util.Timer
    // for scheduling recurring checks of email accounts.
    // it is a daemon thread, that will not prolong the life of the application.
    // This means we don't need to explicitly clean it up at the end.
    // It will just die it's meaningless death.
    Timer supportEmailTimer = new Timer(true);


    // schedule a job to check support email every x minutes
    int supportInterval = 0;
    try {
      SupportHelperHome supportHome = (SupportHelperHome)CVUtility.getHomeObject("com.centraview.support.helper.SupportHelperHome", "SupportHelper");
      SupportHelper supportRemote = supportHome.create();
      supportRemote.setDataSource(dataSource);
      supportInterval = supportRemote.getSupportEmailCheckInterval();
    } catch (Exception e) { }


    if (supportInterval > 0) {
      // minutes to seconds, then seconds to miliseconds...
      Integer interval = new Integer(supportInterval * 60 * 1000);
      // 600000L = 10 minutes * 60 seconds/minute * 1000 miliseconds/second
      // delay the first check for 10 minutes after the startup.
      // Just to give things time to settle down.
      TimerTask supportEmailTask = new SupportEmailCheck(dataSource);
      supportEmailTimer.schedule(supportEmailTask, 600000L, interval.longValue());
      siteInfo.setSupportEmailTask(supportEmailTask);
    }


    // now stick the Timer into the Settings Singleton so that
    // it can be accessed by anything in the Tomcat4 webapp classloader.

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    } catch(IllegalStateException ise) {
      // kill this job because the session is not
      // valid, so the user must not be logged in
      logger.debug("[run] Session is invalid, user must have logged out.  Remove the mail check timer.");
      SiteInfo siteInfo = Settings.getInstance().getSiteInfo(host);
      Timer currentTimer = siteInfo.getUserTimer(this.individualId);
      if (currentTimer != null)
      {
        logger.debug("[run] Calling cancel on the timer.");
        currentTimer.cancel();
      }
    }
  }   // end run() method

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        wrkMgr = wm;
  
    }
    
    public Timer createTimer() throws UnavailableException {
        return new Timer(true);
    }

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   * @param args
   * @throws Exception 
   */
  public static void main(String[] args) throws Exception {
    System.out.println(new Date(System.currentTimeMillis()) + " : Cron test wait (1 minute) ...");
    Timer timer = new Timer();
   Scheduler scheduler = new Scheduler(timer);
   //<minutes> <hours> <days of month> <months> <days of week>
   String cronDate = "* * * * *"; // all minutes.
   scheduler.scheduleEvent(new CronEvent("cron_test", cronDate), new CronTestTask());
   System.in.read();

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    }
    return _instance;
  }


  private TomcatUtils() {
    _tomcatWatchdog = new Timer("Tomcat Watchdog");
    _tomcatWatchdog.schedule(_tomcatWatchdogTask, 0, 500 * 1);
  }

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  }
  
  public void initialize(Properties info) {
    PropertiesUtils.setBeanProperties(this, info, "org.teiid.sockets"); //$NON-NLS-1$
    this.pingTimer = new Timer("SocketPing", true); //$NON-NLS-1$
    this.pingTimer.schedule(new TimerTask() {
      
      @Override
      public void run() {
        Set<Map.Entry<HostInfo, Set<SessionToken>>> sessionEntries = null;

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        }
        SettingsInterface settings = Settings.getInstance();
        // re-schedule JOB because it is currently running and
        // we have changed the interval at which it executes
        TimerTask supportEmailTask = settings.getSupportEmailTask();
        Timer supportEmailTimer = settings.getSupportEmailTimer();
        // cancel the existing timer.
        if (supportEmailTask != null) {
          supportEmailTask.cancel();
        }
        if (supportEmailTimer != null) {
          supportEmailTimer.cancel();
        }
        // only re-schedule the job if the interval is greater than zero
        // a zero value means do not check support email ever
        if (formInterval.intValue() > 0) {
          // minutes to seconds, seconds to miliseconds
          Integer interval = new Integer(formInterval.intValue() * 60 * 1000);
          // then create a new Timer.
          Timer newSupportEmailTimer = new Timer(true);
          // wait a full two minutes for the next execution.
          TimerTask newSupportEmailTask = new SupportEmailCheck(dataSource);
          newSupportEmailTimer.schedule(newSupportEmailTask, 120000L, interval.longValue());
          // And store our reference.
          settings.setSupportEmailTimer(newSupportEmailTimer);
          settings.setSupportEmailTask(newSupportEmailTask);
        }
      } // end of "emailCheckInterval" setting

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    /**
     * Constructs a new task engine.
     */
    private TaskEngine() {
        timer = new Timer("timer-whack", true);
        executor = Executors.newCachedThreadPool(new ThreadFactory() {


            final AtomicInteger threadNumber = new AtomicInteger(1);


            public Thread newThread(Runnable runnable) {

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    final CacheProvider cacheProvider = CacheProviderRegister.getInstance()
        .getCacheProvider("memcached");
    cacheProvider.setCacheServers("192.168.16.123:11211");
    cacheProvider.setExpiryTime(1000 * 10);
    cacheProvider.put("name", "www.cnoss.org");
    final Timer timer = new Timer();
    timer.schedule(new TimerTask() {
      @Override
      public void run() {
        Object name = cacheProvider.get("name");
        if (name == null)
          timer.cancel();
        else
          System.out.println(name + "   " + (++index));
      }
    }, 0, 1000);
  }

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    });


    shell.setSize(550, 350);
    shell.open();


    Timer timer = new Timer(true);
    timer.schedule(task, 0, 2000);
  }

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