[rules-users] Specific Agenda strategy to control which rulesto fire

[Costigliola Joel (EXT)]

Hi Wolgang,

Interesting advice !
I need to study it a little bit to fully understand it and to see if it can meet my future requirements.

Thanks for taking the time to share your insight,
Regards,

Joel

________________________________
De : rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] De la part de Wolfgang Laun
Envoyé : jeudi 29 octobre 2009 08:09
À : Rules Users List
Objet : Re: [rules-users] Specific Agenda strategy to control which rules to fire

I don't think you should consider an agenda strategy for this.

Add a simple class:
   class Score{
     int level; int coun; Deal deal; Book book;
     Score( Deal deal, int level ){...}
  }

and insert an instance along with the Deal to be classified:

insert( deal );
insert( new Score( deal ) );

Rules for level 2 would be written according to:

rule "trader and product"
salience 10
when
   $s : Score( level == 2, $d : deal )
    Deal( this == $d, trader=="Alex", product == "GOOG" )
then
   $s.setCount( $s.getCount() + 1 );
   $s.setBook( "B2" );
end

Then you'll need a couple of rules handling success and failure:

rule "post level success"
salience 5
when
   $s : Score( $l : level, count == 1, $d : deal, $b : book )
then
   assign $d to $b, retract $d
   retract( $s );
end

rule "post level failure"
salience 5
when
   $s : Score( $l : level, count != 1 )
then
   modify( $s ){
       setLevel( $l - 1 );
   }
end

Rules for level 1 would also be at salience 10.

A rule for level == 0 should catch Deals "gone down" through all levels.

-W


2009/10/28 Costigliola Joel (EXT) <joel.costigliola-ext at natixis.com<mailto:joel.costigliola-ext at natixis.com>>
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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This email and any attachment are confidential and may be legally privileged or otherwise protected from disclosure. It is intended only for the stated addressee(s) and access to it by any other person(s) is unauthorised. Any use, dissemination or disclosure not in accordance with its purpose, either in whole or in part, is prohibited without our prior formal approval. Any opinion expressed in this email may not necessarily reflect the opinion of Natixis, its affiliates. It may also be subject to change without prior notice. If you are not an addressee, you must not disclose, copy, circulate or in any other way use or rely on the information contained in this email. If you have received it in error, please inform us immediately and delete all copies. The Internet can not guarantee the integrity of this email therefore Natixis shall not be liable for the email if altered, changed or falsified and anyone who communicates with us by e-mail is taken to accept these risks.
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