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

            // busy spin
        }


        long opsPerSecond = (ITERATIONS * 1000L) / (System.currentTimeMillis() - start);
        queueConsumer.halt();
        future.cancel(true);


        Assert.assertEquals(expectedResult, queueConsumer.getValue());


        return opsPerSecond;
    }

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

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    Future f = delegate.asyncGet(toString(key));
    try {
      obj = f.get(timeout, TimeUnit.SECONDS);
    } catch (Exception ex) {
      log.error("Error in getObject(): " + ex.getMessage());
      f.cancel(true);
    }
    return obj;
  }


  public boolean put(Object key, Object value) {

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        if (errorIndex < futures.size()) {
            for (int index = 0; index < futures.size(); index++) {
                Future<Object> future = futures.get(index);
                if (future.isDone() == false) {
                    future.cancel(true);
                }
            }
        } else {
            for (int index = 0; index < futures.size(); index++) {
                Future<Object> future = futures.get(index);

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


        public synchronized void resumeForce() {
            if(q.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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            future.get(2, TimeUnit.SECONDS);
            fail("Should throw TimeoutException!");
        } catch (TimeoutException expected) {
        }
        assertFalse(future.isDone());
        assertTrue(future.cancel(true));
        assertTrue(future.isCancelled());
        assertTrue(future.isDone());


        try {
            future.get();

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