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

                if(!renderingStopRequested) {
                    requests.put(new EndRequest());
                    painterFuture.get();
                }
            } catch(Exception e) {
                painterFuture.cancel(true);
                fireErrorEvent(e);
            } finally {
                if(localPool) {
                    localThreadPool.shutdown();
                }

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        } catch (Throwable e) {
            logger.error("task supervisor threw an exception", e);
            throwableCounter.increment();
        } finally {
            if (future != null) {
                future.cancel(true);
            }
        }
    }
}

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                    } catch (Exception e) {
                        logger.error("interceptor process error failed", e);
                    }


                } else {
                    future.cancel(true); // 对未完成的进行取消
                }
            }
        } else {
            for (int i = 0; i < futures.size(); i++) {// 收集一下正确处理完成的结果
                Future future = futures.get(i);

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    // 取消一下当前正在执行的异步任务
    private void cancel(List<Future> futures) {
        for (int i = 0; i < futures.size(); i++) {
            Future future = futures.get(i);
            if (future.isDone() == false) {
                future.cancel(true);// 中断之前的操作
            }
        }
    }


    // 调整一下线程池

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    // 取消一下当前正在执行的异步任务
    private void cancel(List<Future> futures) {
        for (int i = 0; i < futures.size(); i++) {
            Future future = futures.get(i);
            if (future.isDone() == false) {
                future.cancel(true);// 中断之前的操作
            }
        }
    }


    // 调整一下线程池

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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(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 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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