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

    return new FlatXmlDataSet(TestCrawlRssFeed.class
        .getResourceAsStream("/TestCrawlRssFeed-input.xml"));
  }


  public void testRun() throws Exception{
    Timer timer = new Timer();
    timer.schedule(crawlRssFeed,0);
    crawlRssFeed.awaitAndShutdown(60,TimeUnit.SECONDS);
        
    Folder folder66 = folderManager.getUserFolder(new User(2), "latest news");
    Folder folder67 = folderManager.getUserFolder(new User(2), "news2");
    assertTrue(folder66.getSize()>0);

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  /**
   * Starts to update the values with the previously set period. Default is 1 second.
   */
  public void start() {
    if (isRunning()) return;
    timer = new Timer(true); // do not block the application on exit
    timer.scheduleAtFixedRate(new TimerTask() {
      public void run() {
        try {
          step();
        } catch (DataException e) {

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    permanentBans = new LinkedList<InetAddressMask>();
    temporalBans = Collections.synchronizedList(new LinkedList<InetAddressMask>());


    /* read ban list from configuration */
    loadBannedIPNetworkListFromDB();
    timer = new Timer();
  }

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     * Sets up a timer to check for hangs frequently.
     */
    private void initTimer() {
        final long initialDelayMs = 0;
        final boolean isDaemon = true;
        Timer timer = new Timer("EventDispatchThreadHangMonitor", isDaemon);
        timer.schedule(new HangChecker(), initialDelayMs, CHECK_INTERVAL_MS);
    }

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     * Creates a timer for use by the Resource Adapter.
     * @return Timer object
     * @throws UnavailableException if a Timer instance is unavailable
     */
    public Timer createTimer() throws UnavailableException {
        return new Timer(true);
    }

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      {
         return;
      }
      
      //Needs to be daemon
      timer = new Timer(true);
      
      //Add a random delay to prevent all timers starting at once
      long delay = (long)(period * Math.random());
      
      task = new SendStatsTimerTask();

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     * 
     * @see java.lang.Thread#run()
     */
    public void run()
    {
        Timer timer = null;


        this._readpool = ThreadPoolFactory.createFixedThreadPool( this._serverInfo.getMaxReadProcessors(),
                                                                  this._readGroup );
        // create a global ThreadPool for network write operations
        this._writePool = ThreadPoolFactory.createFixedThreadPool( this._serverInfo.getMaxWriteProcessors(),
                                                                   this._writeGroup );


        // shall we monitor the ThreadPools and resize them
        // according to server load (this will also recreate died worker
        // threads)
        if ( this._serverInfo.isAutomaticThreadPoolResize() )
        {
            timer = new Timer();


            // schedule a monitor task for the read-process-thread-pool
            timer.schedule( new ThreadPoolResizer( this._readpool, this._serverInfo.getMaxReadProcessors(),
                                                   EJConstants.EJOE_POOL_RESIZER_SHRINKWAIT ), this._serverInfo
                    .getPoolResizePeriod(), this._serverInfo.getPoolResizePeriod() );
            // schedule a monitor task for the writer-thread-pool
            timer.schedule( new ThreadPoolResizer( this._writePool, this._serverInfo.getMaxWriteProcessors(),
                                                   EJConstants.EJOE_POOL_RESIZER_SHRINKWAIT ), this._serverInfo
                    .getPoolResizePeriod(), this._serverInfo.getPoolResizePeriod() );
        }


        try
        {
            Iterator it;
            SocketChannel cChannel;
            SelectionKey selKey;
            ConnectionHeader clientInfo;
            Set keys;


            while ( !isInterrupted() )
            {
                this._load = 0;


                // (pre)register interested socket channels
                registerAspirants();


                // just try endless new selects until there are interested
                // socket channels
                if ( _selector.select() == 0 ) continue;


                keys = this._selector.selectedKeys();
                this._load = keys.size();
                it = this._selector.selectedKeys().iterator();


                // loop over all selected channels, just take care of thread
                // interruption
                while ( it.hasNext() && !isInterrupted() )
                {
                    selKey = (SelectionKey) it.next();
                    // remove the SelectionKey from the Iterator otherwise it
                    // will be lost
                    it.remove();


                    try
                    {
                        // validate the key
                        if ( !selKey.isValid() ) continue;


                        // at least our ConnectionAcceptor has created a client
                        // ConnectionHeader
                        clientInfo = (ConnectionHeader) selKey.attachment();


                        // first check read-availbility
                        if ( selKey.isReadable() )
                        {
                            // get the underlying socket channel
                            cChannel = (SocketChannel) selKey.channel();
                            // cancel the channels registration with our
                            // Selector
                            selKey.cancel();


                            // little bit paranoia
                            if ( cChannel != null && cChannel.isOpen() )
                            {
                                // don't we support NIO?
                                if ( !this._serverInfo.hasNonBlockingReadWrite() )
                                {
                                    logger.log( Level.FINEST,
                                                "Setting socket to blocking mode for further io operations..." );


                                    // prepare the channel for upcoming blocking
                                    // network operations
                                    cChannel.configureBlocking( true );
                                }


                                // schedule a asynchronious read-process operation
                                this._readpool.invokeLater( new ConnectionReader( this, this._serverInfo, clientInfo ) );
                            }
                        }
                        else if ( selKey.isWritable() )
                        {
                            // get the underlying socket channel
                            cChannel = (SocketChannel) selKey.channel();
                            // cancel the channels registration with our
                            // Selector
                            selKey.cancel();


                            // little bit paranoia
                            if ( cChannel != null && cChannel.isOpen() )
                            {
                                // don't we support NIO?
                                if ( !this._serverInfo.hasNonBlockingReadWrite() )
                                {
                                    if ( !clientInfo.hasAttachment() ) continue;
                                    // prepare the channel for upcoming blocking
                                    // network operations
                                    cChannel.configureBlocking( true );
                                }


                                // schedule a asynchronious socket-write
                                // operation
                                this._writePool
                                        .invokeLater( new ConnectionWriter( this, this._serverInfo, clientInfo ) );
                            }
                        }
                    }
                    catch ( CancelledKeyException cke )
                    {
                        logger.log( Level.WARNING, "Key cancelled!", cke );
                    }
                    finally
                    {
                        this._load--;
                    }
                }
            }
        }
        catch ( IOException e )
        {
            logger.log( Level.SEVERE, "!!! IOException occured !!! ", e );
            throw new RuntimeException( e );
        }
        finally
        {
            // kill our ThreadPool monitors if existent
            if ( timer != null ) timer.cancel();


            try
            {
                // shutdown the Read-Process-ThreadPool if existent
                if ( this._readpool != null )

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  public void initialize() {
    // No operation.
  }


  public void startService(){
    mTimer = new Timer();
    mTimer.schedule(this, 200, 1000);
    mLog.info("Pulse service started");
//    addEverySecondListener(this);
//    addCustomTimeListener(this);    
  }

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  private TimerTask monitorPathTask;
  private StatusUpdateTask statusUpdateTask;
  
  public NotificationTimer()
  {
    timer = new Timer();
  }

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        addMouseListener(new MouseAdapter()
        {
            TimerTask timerTask;
            public void mousePressed(MouseEvent mouseevent)
            {
                Timer timer = new Timer();
                timerTask = new TimerTask()
                {
                    public void run()
                    {
                        showSliderMenu();
                    }
                };


                timer.schedule(timerTask, 1000);
            }


            public void mouseReleased(MouseEvent mouseevent)
            {
                if (!sliderMenuVisible)

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