Groups > comp.lang.java.programmer > #22536

Re: Concurrency and restarting tasks

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Date	Tue, 26 Feb 2013 08:09:14 -0800 (PST)
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Subject	Re: Concurrency and restarting tasks
From	me 2 <winona_whitener@yahoo.com>
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On Tuesday, February 26, 2013 9:58:28 AM UTC-5, Joerg Meier wrote:
> On Tue, 26 Feb 2013 06:32:28 -0800 (PST), me 2 wrote:
> 
> 
> 
> > I have an interesting (to me at least!) puzzle.
> 
> 
> 
> > I have a task that can take a long time that I need to run periodically.  I want to be able to cancel the execution of that task.  I've been looking at the Scheduler and Future objects, but I haven't seen how to cleanly stop, wait for a couple of seconds and restart the task on schedule.  And my task won't always take X seconds--sometimes it will generate exceptions or take longer or shorter or any number of other things.
> 
> 
> 
> > There are plenty of examples that show the first steps--setting up the schedule and canceling.  Restarting apparently is not as common.
> 
> 
> 
> As I understand, ThreadS are simply not made to be resumed after being
> 
> cancelled. What you want might simply not be possible. That being said, it
> 
> shouldn't be too hard to simply make a new Thread with your Runnable and
> 
> start that instead of restarting the cancelled one.
> 
> 
> 
> Alternatively, you can make your long running task somehow check for a
> 
> volatile flag and pause if it's set to something.
> 
> 
> 
> Liebe Gruesse,
> 
> 		Joerg
> 
> 
> 
> -- 
> 
> Ich lese meine Emails nicht, replies to Email bleiben also leider
> 
> ungelesen.

Hey,

I suppose you are right.  That doesn't make much sense when you put it like that.

The problem is that I need an event to fire if the task doesn't complete in X seconds.  I guess I don't really care about canceling the thread--just getting the event to fire and then getting set up to attempt the task again.

The double setup with the two scheduled tasks--one to start and one to cancel--gets muddled after like the 4th iteration.

Hmmm....

I'll keep looking.
Me

Thread

Concurrency and restarting tasks me 2 <winona_whitener@yahoo.com> - 2013-02-26 06:32 -0800
  Re: Concurrency and restarting tasks Roedy Green <see_website@mindprod.com.invalid> - 2013-02-26 06:47 -0800
  Re: Concurrency and restarting tasks Joerg Meier <joergmmeier@arcor.de> - 2013-02-26 15:58 +0100
    Re: Concurrency and restarting tasks me 2 <winona_whitener@yahoo.com> - 2013-02-26 08:09 -0800
      Re: Concurrency and restarting tasks Joerg Meier <joergmmeier@arcor.de> - 2013-02-26 18:14 +0100

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