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

        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);


            // 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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                log.trace("suspended ViewHandler");
            Resumer resumer=new Resumer(merge_id, resume_tasks, this);
            Future future=timer.schedule(resumer, resume_task_timeout, TimeUnit.MILLISECONDS);
            Future old_future=resume_tasks.put(merge_id, future);
            if(old_future != null)
                old_future.cancel(true);


        }




        public synchronized void resume(Object merge_id) {

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

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                Future future;
                synchronized(resume_tasks) {
                    future=resume_tasks.remove(merge_id);
                }
                if(future != null)
                    future.cancel(true);
            }
            merge_id=null;
            if(thread == null || !thread.isAlive()) {
                thread=getProtocolStack().getThreadFactory().newThread(this, "ViewHandler");                
                thread.setDaemon(false); // thread cannot terminate if we have tasks left, e.g. when we as coord leave

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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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        for (int i = 0; i < copiers.size(); i++) {
            copiers.get(i).stop();
            final Future future = futures.get(i);


            if (!future.isDone()) {
                future.cancel(true);
            }
        }
    }


    public boolean awaitStreamCopiers(long duration, TimeUnit unit) {

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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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            } 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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      }


      if (future == null)
        break;


      future.cancel(true);
    }
  }


  @SuppressWarnings("unchecked")
  void removeFuture(Future future)

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