[rules-users] Unexpected Accumulate Collect behavior

[Wolfgang Laun]

If the bad sum after run 2 is the sum of run 1 and the correct value
of run 2, chances are that somehow the BresDetail objects of old runs
are reinserted.

(A stateFUL session retaining old BresDetails might be another reason.)

-W

On 08/03/2013, rymy8564 <ryanjmeyer at gmail.com> wrote:
> I'm using Spring AMQP to read messages from RabbitMQ.  After a message is
> read it's deserialized into one header (parent) object and multiple detail
> (child) objects.  Those facts are then inserted into a stateless rule
> session.  Finally, the updated facts are inserted into a database.
>
> I have several rules that will aggregate the detail facts using either the
> collect or accumulate functions.  Here's an example.
>
> rule "Header.TotalDuration"
> when
> 	h : BresHeader()
> 	n : Number()
> 		from accumulate( d : BresDetail(willSendToInvoice==true, uniqueConfID ==
> h.uniqueConfID), sum(d.Duration) )
> then
> 	h.TotalDuration = new Integer(n.longValue());
> 	System.out.println("[TotalDuration] rule ran");
> end
>
> If I run this once (reading in one message) in jUnit, the TotalDuration is
> calculated correctly.  If I run it in tomcat (continuously reading
> messages)
> the values for TotalDuration are not correct and increase after each each
> pass (message is grabbed, rules ran, facts persisted, repeat) and I can't
> figure out why.
>
> Can anyone shed light on this behavior?
>
>
>
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