Examples of java.util.concurrent.Future.cancel()

java.util.concurrent.Future.cancel()
Attempts to cancel execution of this task. This attempt will fail if the task has already completed, has already been cancelled, or could not be cancelled for some other reason. If successful, and this task has not started when {@code cancel} is called,this task should never run. If the task has already started, then the {@code mayInterruptIfRunning} parameter determineswhether the thread executing this task should be interrupted in an attempt to stop the task.
After this method returns, subsequent calls to {@link #isDone} willalways return {@code true}. Subsequent calls to {@link #isCancelled}will always return {@code true} if this method returned {@code true}. @param mayInterruptIfRunning {@code true} if the thread executing thistask should be interrupted; otherwise, in-progress tasks are allowed to complete @return {@code false} if the task could not be cancelled,typically because it has already completed normally; {@code true} otherwise

            } else {
                future.get();
            }
        } catch (TimeoutException e) {
            // timeout then cancel the task
            future.cancel(true);


            // signal we are forcing shutdown now, since timeout occurred
            this.forceShutdown = forceShutdown;


            // if set, stop processing and return false to indicate that the shutdown is aborting

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                                                              (" "+_jbr.getString(_jbr.M_LINK)+" "+keys[0])));
                String newreq = cmd+(linkName == null ? 
                                     (" "+_jbr.getString(_jbr.M_BRIDGE)+" "+_name):
                                     (" "+_jbr.getString(_jbr.M_LINK)+" "+linkName));
                if (cancelWait) {
                   if (future.cancel(true)) {
                       _logger.log(Level.WARNING, _jbr.getKString(_jbr.W_ASYNC_CMD_CANCELED, oldreq)); 
                   }
                }


                String emsg = _jbr.getKString(_jbr.W_ASYNC_CMD_IN_PROCESS, newreq, oldreq);

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        public void run() {
            boolean execute=true;
            synchronized(tasks) {
                Future future=tasks.get(token);
                if(future != null) {
                    future.cancel(false);
                    execute=true;
                }
                else {
                    execute=false;
                }

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    public void testTaskCancellationBeforeTaskHasRun() {
        Future future;
        StressTask task=new StressTask();
        future=timer.scheduleWithDynamicInterval(task);
        assertEquals(1, timer.size());
        future.cancel(true);
        assertEquals(1, timer.size());


        Util.sleep(200);
        int num_executions=task.getNum_executions();
        System.out.println("number of task executions=" + num_executions);

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        StressTask task=new StressTask();
        future=timer.scheduleWithDynamicInterval(task);
        assertEquals(1, timer.size());


        Util.sleep(200); // wait until task has executed
        future.cancel(true);
        assertEquals(1, timer.size());


        int num_executions=task.getNum_executions();
        System.out.println("number of task executions=" + num_executions);
        assertTrue("task should have executed at least 1 time, as it was cancelled after 200ms", num_executions >= 1);

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        RepeatingTask task=new RepeatingTask(500);
        future=timer.scheduleWithDynamicInterval(task);
        Util.sleep(5000);


        System.out.println("<<< cancelling task");
        future.cancel(true);
        Util.sleep(2000);
        int num=task.getNum();
        System.out.println("task executed " + num + " times");
        assertTrue(num >= 9 && num < 11);
    }

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        for(int i=0; i < 1000; i++) {
            for(int j=0; j < 1000; j++) {
                t=new StressTask();
                Future future=timer.scheduleWithDynamicInterval(t);
                future.cancel(true);
            }
            System.out.println(i + ": " + timer.size());
        }
        for(int i=0; i < 10; i++) {
            System.out.println(timer.size());

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        public void run() {
            boolean execute=true;
            synchronized(tasks) {
                Future future=tasks.get(token);
                if(future != null) {
                    future.cancel(false);
                    execute=true;
                }
                else {
                    execute=false;
                }

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        public void run() {
            boolean execute=true;
            synchronized(tasks) {
                Future future=tasks.get(token);
                if(future != null) {
                    future.cancel(false);
                    execute=true;
                }
                else {
                    execute=false;
                }

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      launcher.containerLauncher = mock(ExecutorService.class);
      Future future = mock(Future.class);
      when(launcher.containerLauncher.submit
          (any(Callable.class))).thenReturn(future);
      when(future.isDone()).thenReturn(false);
      when(future.cancel(false)).thenReturn(true);
      launcher.init(new Configuration());
      launcher.start();
      dispatcher.register(ContainersLauncherEventType.class, launcher);


      ctxt = mock(ContainerLaunchContext.class);

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