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

        assertNull(out);
    }


    public void testConvertFutureCancelledThenOkay() {
        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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            } 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 f = new GDataIndexer.FinishingFuture();
        assertNull(f.get());
        assertNull(f.get(0,TimeUnit.MICROSECONDS));
        assertTrue(f.isDone());
        assertFalse(f.isCancelled());
        assertFalse(f.cancel(true));
        
    }

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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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    // 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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        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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        assertNull(out);
    }


    public void testConvertFutureCancelledThenOkay() {
        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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            } 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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    public void cancel() {
        logger.info("canal Futures[{}]", futures.size());
        for (int i = 0; i < futures.size(); i++) {
            Future future = futures.get(i);
            if (!future.isDone() && !future.isCancelled()) {
                future.cancel(true);
            }
        }
    }


    // 调整一下线程池

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    synchronized (monitoredFutures) {
      Iterator it = monitoredFutures.iterator();
      while (it.hasNext()) {
        Future future = (Future) it.next();
        if (!future.equals(successFuture)) {
          future.cancel(true);
        }
      }
    }
  }

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