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

        Future future;
        StressTask task=new StressTask();
        try {
            future=timer.scheduleWithDynamicInterval(task);
            assert timer.size() == 1;
            future.cancel(true);
            assert timer.size() == 1;
            Util.sleep(200);
            int num_executions=task.getNumExecutions();
            System.out.println("number of task executions=" + num_executions);
            assert num_executions ==0 : "task should never have executed as it was cancelled before execution";

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        try {
            future=timer.scheduleWithDynamicInterval(task);
            assert timer.size() == 1;


            Util.sleep(500); // wait until task has executed
            future.cancel(true);
            int size=timer.size();
            assert size == 1 : " timer size should be 1, but is " + size;


            int num_executions=task.getNumExecutions();
            System.out.println("number of task executions=" + num_executions);

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        try {
            future=timer.scheduleAtFixedRate(task, 0, 300, TimeUnit.MILLISECONDS);
            Util.sleep(3200);


            System.out.println("<<< cancelling task");
            future.cancel(true);
            Util.sleep(1000);
            int num=task.getNum();
            System.out.println("task executed " + num + " times");
            
            assert num >= 8 && num <= 11 : "number of executions is " + num + ", but should be >= 8 and <= 11\n" +

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            System.out.println("-- adding "+ (NUM_A * NUM_B) + " tasks...");
            for(int i=0; i < NUM_A; i++) {
                for(int j=0; j < NUM_B; j++) {
                    t=new StressTask();
                    Future future=timer.scheduleWithDynamicInterval(t);
                    future.cancel(true);
                    cnt++;
                    if(cnt > 0 && cnt % print == 0)
                        System.out.println(cnt);
                }
            }

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            Future future;
            synchronized(resume_tasks) {
                future=resume_tasks.remove(merge_id);
            }
            if(future != null)
                future.cancel(true);
            resumeForce();
        }


        public synchronized void resumeForce() {
            if(queue.closed())

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

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      return future.get(_timeout, TimeUnit.MILLISECONDS);
    }
    catch (Exception e)
    {
      System.out.println("script did not terminate within " + _timeout + " ms");
      future.cancel(true);
      return null;
    }
  }


  /*

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        else
          break;
      }


      if (future != null)
        future.cancel(true);
    }
    
    _futureSet.clear();
  }

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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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