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

    _sipFactory = (SipFactory) getServletContext().getAttribute(SipServlet.SIP_FACTORY);
    _bindings = new HashMap<String, SortedSet<Binding>>();
    
    getServletContext().setAttribute(Binding.class.getName(), _bindings);
    
    _timer = new Timer();
    _timer.scheduleAtFixedRate(new BindingScavenger(), 5000, 5000);
    
    _dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z", Locale.US);
    _dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
  }

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            if (Log.isDebugEnabled())
                Log.debug("starting local scavenger thread...(period: " + getScavengerPeriod() + " secs)");
            long delay = getScavengerPeriod() * 1000;
            boolean isDaemon = true;
            _scavenger = new Timer(isDaemon);
            _scavenger.scheduleAtFixedRate(new Scavenger(), delay, delay);
            Log.debug("...local scavenger thread started");
            _started = true;
        }

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    // Store LifeCycle
    public void start() throws Exception
    {
        boolean isDaemon = true;
        _scavenger = new Timer(isDaemon);
        long delay = _scavengerPeriod
                + Math.round(Math.random() * _scavengerPeriod);
        if (Log.isDebugEnabled())
          Log.debug("starting distributed scavenger thread...(period: "
                    + delay + " secs)");

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    public List<Member> getMembers(){
        return this.activeMembers;
    }


    public void startApplicationMembershipTimer(){
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new MemberActivatorTask(), 1000, 500);
    }

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        if (messageQueue.isPersistent()) {
            log.info("Loading the persisted messages if there are any to the message queue");
            messageQueue.load();
        }


        Timer samplingTimer = synapseEnvironment.getSynapseConfiguration().getSynapseTimer();
        messageProcessor = new MessageProcessor();
        log.info("Scheduling the sampling timer to invoke the message processor " +
                "at an interval of : " + unitTime);
        samplingTimer.schedule(messageProcessor, 0, unitTime);
    }

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      long cacheRefreshDelay, String refreshThreadName, SnapshotFileInspector inspectSnapshotFiles) {
    this.fs = fs;
    this.fileInspector = inspectSnapshotFiles;
    this.snapshotDir = SnapshotDescriptionUtils.getSnapshotsDir(rootDir);
    // periodically refresh the file cache to make sure we aren't superfluously saving files.
    this.refreshTimer = new Timer(refreshThreadName, true);
    this.refreshTimer.scheduleAtFixedRate(new RefreshCacheTask(), cacheRefreshDelay,
      cacheRefreshPeriod);
  }

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    /**
     * Starts timer if it is not already started
     */
    private synchronized void startTimer() {
         if (timer == null) {
            timer = new Timer();
            TimerTask task = new TimerTask() {
                public void run() {
                  try {
                    timerEvent();
                  }

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    //GBeanLifeCycle
    public synchronized void doStart() throws Exception {
        load();
        if (!readOnly) {
            timer = new Timer(true);
        }
        log.debug("Started LocalAttributeManager with data on " + serverOverride.getConfigurations().size() + " configurations");
    }

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            }


            synchronized (this) {
                reconfigure();


                timer = new Timer(true);


                // Periodically check the configuration file
                schedule();
            }

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        this.executor = executor;
        this.transactionManager = transactionManager;
    }


    public void doStart() throws Exception {
        delegate = new Timer(true);
    }

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