如何以固定速率加入时间表

Question

If you have a an executor service which you submit via scheduleAtFixedRate such as this

public void methodName() {
    executorService.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            //do some operations
            //getSomeResults()
        }

    }, x, y, TimeUnit.SECONDS);
}

Is it possible to join with another thread which is responsible for getSomeResults()? For example, I want the thread to wait for the getSomeResults() to finish before it continues - is this possible?

Thanks

Answer 1

Yes, you want to submit a FutureTask rather than a Runnable . (A FutureTask is a Runnable , so you don't need to change anything else.)

If you create a FutureTask then you can have another thread invoke its .get() method, which will block until the task is complete, and it will return the result.

(The cleanest way will be to get rid of your getSomeResults() method entirely, and just use the get() method of FutureTask ; but there's nothing to stop you leaving your code more or less as it is, and just using get() as a way of blocking, if you want to try that first to check it's all working.)