How to know when ScheduledExecutorService is completed

Question

Sorry for my somewhat confusion but i am getting a little confused and need some assistance with concurrency.

If i have a thread pool in a class which calculates some value every 10 seconds such as this

private final ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);
executorService.schedule(callable, 10, TimeUnit.SECONDS);

How can I determine when the result has come back. When the result is ready I need to process a map and do some calculations and then delete / empty the map

The only way I can think of is to user Observable interface but I am guessing this is not the correct approach

Thanks

Why don't you initiate the followup action from within the scheduled task? That would be the most natural approach. — Marko Topolnik, Oct 07 '14 at 08:22
It returns a scheduled future < integer> however - this essentially won't run once, it will run continuously with the number changing, so do i just need to keep checking for scheduled future.isdone in a loop? once is done is true i have a new result? — Biscuit128, Oct 07 '14 at 08:27

score 1 · Answer 1 · answered Oct 07 '14 at 08:27

1

You can use ScheduledFuture and invoke isDone (because ScheduledFuture extends Future) like this

ScheduledFuture schedule = executorService.schedule(callable, 10, TimeUnit.SECONDS);
schedule.isDone()

answered Oct 07 '14 at 08:27

sol4me

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Hi I added a comment at the top which questions is done a little. Thanks – Biscuit128 Oct 07 '14 at 08:28
@Biscuit128 so you want to invoke/perform multiple actions when isDone() returns true ? – sol4me Oct 07 '14 at 08:31
Basically it's a lottery game but the number will keep changing every x seconds when it's done I need to do some checks of who won – Biscuit128 Oct 07 '14 at 08:32
Have you Taken a look at FutureWatcher utility https://gist.github.com/samhendley/6030565 – sol4me Oct 07 '14 at 08:35

How to know when ScheduledExecutorService is completed

1 Answers1