Examples of java.util.concurrent.ScheduledExecutorService.scheduleAtFixedRate()

Class java.util.concurrent.ScheduledExecutorService

Examples of java.util.concurrent.ScheduledExecutorService.scheduleAtFixedRate()

java.util.concurrent.ScheduledExecutorService.scheduleAtFixedRate()
Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after {@code initialDelay} then {@code initialDelay+period}, then {@code initialDelay + 2 * period}, and so on. If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor. If any execution of this task takes longer than its period, then subsequent executions may start late, but will not concurrently execute. @param command the task to execute @param initialDelay the time to delay first execution @param period the period between successive executions @param unit the time unit of the initialDelay and period parameters @return a ScheduledFuture representing pending completion ofthe task, and whose {@code get()} method will throw anexception upon cancellation @throws RejectedExecutionException if the task cannot bescheduled for execution @throws NullPointerException if command is null @throws IllegalArgumentException if period less than or equal to zero

    final List<Integer> pool = new ArrayList<Integer>();
    final ScheduledFuture<?> f1 = scheduler.scheduleAtFixedRate(new SleepingRunnable(1, 10, pool), 0, 10, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f2 = scheduler.scheduleAtFixedRate(new SleepingRunnable(2, 10, pool), 0, 10, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f3 = scheduler.scheduleAtFixedRate(new SleepingRunnable(3, 10, pool), 0, 10, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f4 = scheduler.scheduleAtFixedRate(new SleepingRunnable(4, 10, pool), 0, 10, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f5 = scheduler.scheduleAtFixedRate(new SleepingRunnable(5, 50, pool), 0, 10, TimeUnit.MILLISECONDS);
    Thread.sleep(180);
    f1.cancel(true);
    f2.cancel(true);
    f3.cancel(true);
    f4.cancel(true);

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  @Test
  public void scheduleUpdateOperation_executionOrderPredictableWhenSingleThreaded_2() throws InterruptedException, ExecutionException {
    final ScheduledExecutorService scheduler = ExecutorServices.createScheduler();
    final List<Integer> pool = new ArrayList<Integer>();
    final ScheduledFuture<?> f1 = scheduler.scheduleAtFixedRate(new SleepingRunnable(1, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f5 = scheduler.scheduleAtFixedRate(new SleepingRunnable(5, 50, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f4 = scheduler.scheduleAtFixedRate(new SleepingRunnable(4, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f3 = scheduler.scheduleAtFixedRate(new SleepingRunnable(3, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f2 = scheduler.scheduleAtFixedRate(new SleepingRunnable(2, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    Thread.sleep(90);

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  @Test
  public void scheduleUpdateOperation_executionOrderPredictableWhenSingleThreaded_2() throws InterruptedException, ExecutionException {
    final ScheduledExecutorService scheduler = ExecutorServices.createScheduler();
    final List<Integer> pool = new ArrayList<Integer>();
    final ScheduledFuture<?> f1 = scheduler.scheduleAtFixedRate(new SleepingRunnable(1, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f5 = scheduler.scheduleAtFixedRate(new SleepingRunnable(5, 50, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f4 = scheduler.scheduleAtFixedRate(new SleepingRunnable(4, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f3 = scheduler.scheduleAtFixedRate(new SleepingRunnable(3, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f2 = scheduler.scheduleAtFixedRate(new SleepingRunnable(2, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    Thread.sleep(90);
    f1.cancel(true);

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  public void scheduleUpdateOperation_executionOrderPredictableWhenSingleThreaded_2() throws InterruptedException, ExecutionException {
    final ScheduledExecutorService scheduler = ExecutorServices.createScheduler();
    final List<Integer> pool = new ArrayList<Integer>();
    final ScheduledFuture<?> f1 = scheduler.scheduleAtFixedRate(new SleepingRunnable(1, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f5 = scheduler.scheduleAtFixedRate(new SleepingRunnable(5, 50, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f4 = scheduler.scheduleAtFixedRate(new SleepingRunnable(4, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f3 = scheduler.scheduleAtFixedRate(new SleepingRunnable(3, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f2 = scheduler.scheduleAtFixedRate(new SleepingRunnable(2, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    Thread.sleep(90);
    f1.cancel(true);
    f2.cancel(true);

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    final ScheduledExecutorService scheduler = ExecutorServices.createScheduler();
    final List<Integer> pool = new ArrayList<Integer>();
    final ScheduledFuture<?> f1 = scheduler.scheduleAtFixedRate(new SleepingRunnable(1, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f5 = scheduler.scheduleAtFixedRate(new SleepingRunnable(5, 50, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f4 = scheduler.scheduleAtFixedRate(new SleepingRunnable(4, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f3 = scheduler.scheduleAtFixedRate(new SleepingRunnable(3, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f2 = scheduler.scheduleAtFixedRate(new SleepingRunnable(2, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    Thread.sleep(90);
    f1.cancel(true);
    f2.cancel(true);
    f3.cancel(true);

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    final List<Integer> pool = new ArrayList<Integer>();
    final ScheduledFuture<?> f1 = scheduler.scheduleAtFixedRate(new SleepingRunnable(1, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f5 = scheduler.scheduleAtFixedRate(new SleepingRunnable(5, 50, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f4 = scheduler.scheduleAtFixedRate(new SleepingRunnable(4, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f3 = scheduler.scheduleAtFixedRate(new SleepingRunnable(3, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    final ScheduledFuture<?> f2 = scheduler.scheduleAtFixedRate(new SleepingRunnable(2, 10, pool), 0, 100, TimeUnit.MILLISECONDS);
    Thread.sleep(90);
    f1.cancel(true);
    f2.cancel(true);
    f3.cancel(true);
    f4.cancel(true);

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      }
      
    };


    ScheduledExecutorService ioLoop = Executors.newSingleThreadScheduledExecutor();
    ioLoop.scheduleAtFixedRate(ioLoopTask, 0, 1, TimeUnit.MILLISECONDS);


    final CountDownLatch latch = new CountDownLatch(n);
    ScheduledExecutorService workerThreads = Executors.newScheduledThreadPool(nThreads);
    Runnable work = new Runnable() {

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        }
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                final ScheduledExecutorService ses = Executors.newScheduledThreadPool(1, new DaemonThreadFactory(ThreadStackRule.class.getSimpleName() + "-"));
                final ScheduledFuture<?> task = ses.scheduleAtFixedRate(new Runnable() {
                    @Override
                    public void run() {
                        final RuntimeMXBean bean = ManagementFactory.getRuntimeMXBean();


                        String pid = bean.getName();

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     * Due to the lack of contract in CDI guaranteeing when beans will be available, we use an
     * executor to search for the beans every 100ms until it finds them. Or, after a 25 seconds,
     * blow up if they don't become available.
     */
    final ScheduledExecutorService startupScheduler = Executors.newScheduledThreadPool(1);
    startupScheduler.scheduleAtFixedRate(new StartupCallback(beanManager, bus, startupScheduler, 25), 0, 100,
            TimeUnit.MILLISECONDS);


    for (final Class<?> remoteInterfaceType : managedTypes.getRemoteInterfaces()) {
      createRPCScaffolding(remoteInterfaceType, bus, beanManager);
    }

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        org.apache.cassandra.SchemaLoader.loadSchema();
        org.apache.cassandra.SchemaLoader.schemaDefinition(""); // leave def. blank to maintain old behaviour
        final AtomicLong count = new AtomicLong();
        final long start = System.currentTimeMillis();
        System.out.println(String.format(format, "seconds", "max_mb", "allocated_mb", "free_mb", "diffrence", "count"));
        scheduled.scheduleAtFixedRate(new Runnable() {
            long lastUpdate = 0;


            public void run() {
                Runtime runtime = Runtime.getRuntime();
                long maxMemory = mb(runtime.maxMemory());

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