usage question

I'm attempting to use IPC::DirQueue 0.08 for a project where messages
are queued for later processing.  However, when dequeuing these
messages, it will be possible that a message cannot be processed
immediately, but could be processed later.

I thought I'd be able to use IPC::DirQueue like this:

my $dq = IPC::DirQueue->new( \%dq_opts );
while (1) {
my $job = $dq->pickup_queued_job();
last if (! $job);

my $rc = &process_job( $job );
if ($rc) {
$job->finish();
} else {
$job->return_to_queue();
}
}

But if, say, the first job is returned to the queue, then a subsequent
call to pickup_queued_job() returns that same job.  Turning the loop
above into an infinite loop (absent an external event which suddenly
causes process_job() to return true).

I've read through the IPC::DirQueue and IPC::DirQueue::Job pod pages,
but I'm not seeing any way to iterate through the queue the way that I
need.  The closest method I can see is visit_all_jobs(), but that only
provides read-only Job objects.  I suppose I could play with the
read-only flag within the callback function, but that doesn't seem
right.

Does anyone have any suggestions?

--
Thomas J. Pinkl                     |  T: 215-442-9300
Senior Systems Architect            |     800-444-1427
Health Business Systems, Inc        |  F: 215-442-7555
An SXC Company                      |
738 Louis Drive                     |  http://www.hbsrx.com/
Warminster, PA 18974                |  http://www.sxc.com/

hi Thomas --

an interesting use-case I hadn't considered! ;)  The problem is that
when the queue is accessed in ordered mode, it's simply a lexical
sort by filename; and when accessed in unordered mode, it's simply
the OS-based ordering rather than in any way "random".

What about re-queueing the deferred jobs?  ie.

my $dq = IPC::DirQueue->new( \%dq_opts );
while (1) {
my $job = $dq->pickup_queued_job();
last if (! $job);

my $rc = &process_job( $job );
if (!$rc) {
$job->enqueue_file($job->get_data_path());
}
$job->finish();
}

in other words, if a job is to be deferred, take it off the queue
and re-queue it under a new name.

Alternatively, I'd be happy to apply a patch that implements
a version of visit_all_jobs() which allows writes somehow, or
a way to access a job returned by visit_all_jobs() and render
it writable.

--j.

Thomas J Pinkl writes:
> I'm attempting to use IPC::DirQueue 0.08 for a project where messages
> are queued for later processing.  However, when dequeuing these
> messages, it will be possible that a message cannot be processed
> immediately, but could be processed later.
>
> I thought I'd be able to use IPC::DirQueue like this:
>
> 	my $dq = IPC::DirQueue->new( \%dq_opts );
> 	while (1) {
> 		my $job = $dq->pickup_queued_job();
> 		last if (! $job);
>
> 		my $rc = &process_job( $job );
> 		if ($rc) {
> 			$job->finish();
> 		} else {
> 			$job->return_to_queue();
> 		}
> 	}
>
> But if, say, the first job is returned to the queue, then a subsequent
> call to pickup_queued_job() returns that same job.  Turning the loop
> above into an infinite loop (absent an external event which suddenly
> causes process_job() to return true).
>
> I've read through the IPC::DirQueue and IPC::DirQueue::Job pod pages,
> but I'm not seeing any way to iterate through the queue the way that I
> need.  The closest method I can see is visit_all_jobs(), but that only
> provides read-only Job objects.  I suppose I could play with the
> read-only flag within the callback function, but that doesn't seem
> right.
>
> Does anyone have any suggestions?
>
> --
> Thomas J. Pinkl                     |  T: 215-442-9300
> Senior Systems Architect            |     800-444-1427
> Health Business Systems, Inc        |  F: 215-442-7555
> An SXC Company                      |
> 738 Louis Drive                     |  http://www.hbsrx.com/
> Warminster, PA 18974                |  http://www.sxc.com/

On Mon, Mar 05, 2007 at 11:24:07AM +0000, Justin Mason wrote:
> Alternatively, I'd be happy to apply a patch that implements
> a version of visit_all_jobs() which allows writes somehow, or
> a way to access a job returned by visit_all_jobs() and render
> it writable.

Justin, here's a patch which adds an optional "readonly" parameter
to visit_all_jobs().  If the parameter isn't passed, then it defaults
to true, thus maintaining backward compatibility.  The patch
includes changes to the POD as well.  It's against the current SVN
source.

--
Thomas J. Pinkl                     |  T: 215-442-9300
Senior Systems Architect            |     800-444-1427
Health Business Systems, Inc        |  F: 215-442-7555
An SXC Company                      |
738 Louis Drive                     |  http://www.hbsrx.com/
Warminster, PA 18974                |  http://www.sxc.com/

On Mon, Mar 05, 2007 at 11:28:03AM -0500, Thomas J Pinkl wrote:
> Justin, here's a patch which adds an optional "readonly" parameter
> to visit_all_jobs().  If the parameter isn't passed, then it defaults
> to true, thus maintaining backward compatibility.  The patch
> includes changes to the POD as well.  It's against the current SVN
> source.

Perhaps I whipped this up too quickly.  The read-only flag works, as
far as it goes, but jobs are not considered "active" when read-only
is false.

If I understand the code correctly, then I'll also have to do
something to make the job "active" from within visit_all_jobs().

Is that correct?

--
Thomas J. Pinkl                     |  T: 215-442-9300
Senior Systems Architect            |     800-444-1427
Health Business Systems, Inc        |  F: 215-442-7555
An SXC Company                      |
738 Louis Drive                     |  http://www.hbsrx.com/
Warminster, PA 18974                |  http://www.sxc.com/

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