11:17 a.m.
Hello,
Me again and no it is not spamming, and I'm still drools newbie ;-)
I was facing a problem of infinite loop with one of my rule, I have solved it but I'm
wondering if my solution is not too costful on a performance point of view.
So my question is really on the most efficient way of solving the infinite loop problem
I'm gonna expose you right now.
First of all, a few words the problem I want to solve with Drools :
My company is a bank where traders are making deals on markets, these deals must be
classified in book, this is what we call "booking process".
Booking is done according to booking criteria : which trader has made the deal ? on which
product ? etc ...
A booking rule defines a set of criteria and the target book where the deal will
classified.
The guilty rule's job was to fill DealMatchingBookingRules with the booking rules
applicable on a deal, (DealMatchingBookingRules references a unique deal).
I have put below a corrected version by commenting the update($dealMatchingBookingRules)
instruction of the RHS.
With update uncommented, the problem occurred when 2 booking rule were matching the same
deal in here's my understanding of the problem
Facts inserted in the session :
- dmbr1 (instance of DealMatchingBookingRule) referencing a deal
- br1 and br2 matching the deal referenced in dmr1
Results :
1. rule is activated with (dmbr1, br1), dmbr1 is updated
2. rule is activated with (dmbr1, br2), dmbr1 is updated - (dmbr1, br1) does not
activate the rule because of no-loop rule attribute
3. rule is activated AGAIN with (dmbr1, br1), dmbr1 is updated : back to step 1
4. rule is activated AGAIN with (dmbr1, br2), dmbr1 is updated : back to step 2
5. infinite loop on step1 & step 2
I have fixed the problem by removing the call to update, but for the next steps of my
process (not shown here) Drools need to aware of the modified DealMatchingBookingRules. I
thus have written a rule which only update all DealMatchingBookingRules.
Is there a better way to solve this infinite loop ?
Feel free to make comments, I'm really open to any suggestion/enhancement.
Regards,
Joël Costigliola
rule "Find matching level 1 booking rules by deal"
salience 10
no-loop
ruleflow-group "Find level 1 matching booking rules by deal group"
when
$dealMatchingBookingRules : DealMatchingBookingRules($dealModel : deal,
$dealProductRelatedIndexes : dealProductRelatedIndexes)
$bookingRule : BTExecutionBookingRuleModel (
priority == 1
// when a criterion is not set, it is considered as satisfied.
&& (traderCriterion == null || $dealModel.trader == traderCriterion)
&& (portfolioCriterion == null || $dealModel.portfolio ==
portfolioCriterion)
// when a product type criterion is set to unknown, it is considered as satisfied
whatever deal product type is.
&& (productTypeStringCriterion == null || productTypeCriterion ==
ProductType.Unknown
|| $dealModel.product.productType == productTypeCriterion)
&& (listedIndexCriterion == null ||
$dealProductRelatedIndexes.relatedIndexes contains listedIndexCriterion)
)
then
$dealMatchingBookingRules.addMatchingBookingRule($bookingRule);
// update($dealMatchingBookingRules) : COMMENTED BECAUSE WAS CAUSING INFINITE LOOP !
end
// Does the job of update($dealMatchingBookingRules) but without INFINITE LOOP.
rule "Refresh facts in level 1 booking rule process"
salience 5
no-loop
ruleflow-group "Refresh facts in level 1 booking rule process group"
when
$dealMatchingBookingRules : DealMatchingBookingRules()
then
update($dealMatchingBookingRules);
end
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