>> I agree the order of callbacks will be correct. However, if there is
significant delay in scheduling the work the latency of the callbacks
would be unexpected - as a client, I would expect workAccepted to be
called before the scheduling delay (on enqueue) and workStarted after
the delay (on dispatch).

Ok, I take your point. I will make the changes and submit the patch.

-----Original Message-----
From: Jeremy Boynes [mailto:[EMAIL PROTECTED] 
Sent: 24 July 2006 20:23
To: tuscany-dev@ws.apache.org
Subject: Re: [jira] Created: (TUSCANY-573) Race condition in
ThreadPoolWorkManager

On Jul 24, 2006, at 12:00 PM, Meeraj Kunnumpurath wrote:

> Jeremy,
>
> Apologies if you have received my earlier email (my internet mail 
> account doesn't seem to work always)

I think this is one of them - the previous mail I have was at 10:11AM
PDT.

> Executors.newFoxedThreadPool() creates a thread pool backed by an 
> unbounded queue. This means even when all threads are in use, work 
> won't be rejected. In terms of when and where the workAccepted method 
> is invoked, can we say is an implementation detail, as long as the 
> order in which the callbacks are executed are guaranteed. 
> Alternatively, we could wait on workAccepted callback on the monitor 
> for the work item before calling workStarted.

I agree the order of callbacks will be correct. However, if there is
significant delay in scheduling the work the latency of the callbacks
would be unexpected - as a client, I would expect workAccepted to be
called before the scheduling delay (on enqueue) and workStarted after
the delay (on dispatch).

Invoking the callback whilst holding a monitor is normally a bad idea
but in this case I think it should be safe enough. There may be problems
if the workAccepted callbacks run too long but perhaps we just put that
down to user error.

--
Jeremy


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