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Newsgroups: comp.lang.java.programmer
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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Xref: csiph.com comp.lang.java.programmer:22536

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:
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> > I have an interesting (to me at least!) puzzle.
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> > 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 looki=
ng at the Scheduler and Future objects, but I haven't seen how to cleanly s=
top, 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.
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> > There are plenty of examples that show the first steps--setting up the =
schedule and canceling.  Restarting apparently is not as common.
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> As I understand, ThreadS are simply not made to be resumed after being
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> cancelled. What you want might simply not be possible. That being said, i=
t
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> shouldn't be too hard to simply make a new Thread with your Runnable and
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> start that instead of restarting the cancelled one.
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> Alternatively, you can make your long running task somehow check for a
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> volatile flag and pause if it's set to something.
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> Liebe Gruesse,
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> 		Joerg
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> --=20
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> Ich lese meine Emails nicht, replies to Email bleiben also leider
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> 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 g=
etting 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 canc=
el--gets muddled after like the 4th iteration.

Hmmm....

I'll keep looking.
Me