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);


            // if set, stop processing and return false to indicate that the shutdown is aborting
            if (abortAfterTimeout) {
                LOG.warn("Timeout occurred. Aborting the shutdown now.");
                return false;

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


            if (shutdownNowOnTimeout) {
                LOG.warn("Timeout occurred. Now forcing the routes to be shutdown now.");
                // force the routes to shutdown now
                shutdownRoutesNow(routesOrdered);

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


            // if set, stop processing and return false to indicate that the shutdown is aborting
            if (abortAfterTimeout) {
                LOG.warn("Timeout occurred. Aborting the shutdown now.");
                return false;

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


            // if set, stop processing and return false to indicate that the shutdown is aborting
            if (abortAfterTimeout) {
                LOG.warn("Timeout occurred. Aborting the shutdown now.");
                return 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(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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            } else {
                future.get();
            }
        } catch (TimeoutException e) {
            // timeout then cancel the task
            future.cancel(true);


            if (shutdownNowOnTimeout) {
                LOG.warn("Timeout occurred. Now forcing all routes to be shutdown now.");
                // force the routes to shutdown now
                shutdownRoutesNow(routes);

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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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        assertNull(out);
    }


    public void testConvertFutureCancelled() {
        Future future = template.asyncRequestBody("direct:foo", "Hello World");
        future.cancel(true);


        Object out = context.getTypeConverter().convertTo(String.class, future);
        // should be null since its cancelled
        assertNull(out);
    }

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