9:08 a.m.
I forgot to give the priority of the booking rules in my example, here it is :
- BR1 : low priority (1
- BR2 : higher priority (2)
- BR3 : same as BR2
Sorry
Joel
________________________________
De : rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] De
la part de Costigliola Joel (EXT)
Envoyé : mercredi 28 octobre 2009 14:57
À : 'Rules Users List'
Objet : [rules-users] Specific Agenda strategy to control which rules to fire
Hello all,
I need some help to to set a specific Agenda strategy in order to control finely which
activated rules will be fired.
Problem context :
-----------------
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 ? wich market ? etc ...
A booking rule defines a set of criteria and the target book where the deal will
classified, it also has a priority, note that it is ok that two booking rule have same
priority.
I want to implement booking rule as Drools rule.
Several booking rule can be applied to a deal, in that case choosing the right booking
rule to fire depends on the following algorithm :
- look all the activated booking rule of the highest priority,
--- if there is a unique rule apply it
--- if there is no unique rule (0 rule or more than one), look at rules of a lesser
priority and apply the same logic.
Next section is an example that will clear things (I hope).
Example :
---------
A deal D1 has been done by Alex on NY market to buy Google stocks.
We have 3 booking rules :
- BR1 : criteria = trader=Alex / book = B1
- BR2 : criteria = trader=Alex and product = google stock / book = B2
As BR2 is more precise than BR1, il will matches the deal and book it in B1
If the deal was on another product, BR1 would have been applied.
Things gets more complicated when 2 rules of same priority can be applied.
Let's imagine we add the following booking rule
- BR3 : criteria = trader=Alex and market = NY / book = B3
We have a problem to book D1 since BR2 and BR3 can be applied but have same priority.
We can't choose one over the other thus we must apply a less precise/prioritary rule
(if unique at its own precision level).
In my example, that would lead to apply BR1.
Question :
----------
If I define BR1,BR2,BR3 as Drools rules, how can I tell Drools :
- to execute a rule only if there is no other active rule with same precision that could
be applied ?
- to look for a unique matching rule with less precision level ?
I think it's the Agenda responsibility to take this decision, but I don't know how
implement that.
Can you give some advices on that ?
Thanks for your lights in advance,
Regards,
Joel
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