I won't recommend using agenda groups in this case. If you want to make sure
that a message is sent once and only once per customer, the predicate for each
rule should look like :
When
customer : Customer()
"Your custom business logic" && !customer.sentAEvent
Then
sendEventToCustomer
customer.sentAEvent = true
drools.assert(customer.sentAEvent)
End
This will ensure that only one event would get sent. Even if you use Agenda
Groups, you can't prevent the LHS (condition statement) to be evaluated for
every single rule. In the case where you have multiple rule's LHS are evaluted
to be true, the "drools.assert" executed during the first valid rule would
cause a revaluation of all rules that has "!customer.sentEvent" in its
condition. When the re-evaluations reoccur, the !customer.sendAEvent is
evaluated to false, hence a event is never sent twice to the customer.
Agenda groups isn't a good idea because then your agenda groups is tightly tied
to the data. You might end up creating more and more agenda groups for each
customer.
Does that make sense :P
Regards,
Alan Ho
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of jdepaul
Sent: Tuesday, February 13, 2007 9:43 AM
To: [email protected]
Subject: [rules-users] Short-circuit rules by group?!
I have several rules defined in groups by Customer, so I have number of rules
for Walmart, some rules for NIKE, more rules for SomeCustomer... When one of
the rules matches for a given customer I need to send an event notification. I
need to make sure that I send only ONE event notification per Customer
(regardless of how many rules were matched), thus after finding the very first
match in the Walmart group, I'd like to activate a rule, and then short-circuit
and "Skip" to the next group of rules for NIKE - to see if any of the matches
are found in the next group.
I've implemented this functionality using a Match object, which I assert into
WorkingMemory whenever I find a match for customer, then all my rules check for
absence of Match for given customer...
This works, but I wonder if there is a better way to do it - using Agenda
Groups, maybe - once I find ONE match for Walmart, skip to the next Agenda
Group?! Could someone comment on this?
THanks,
James
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