[rules-users] Rules that cumulate on consequence

[Geoffrey De Smet]

Good idea,

but note that it will only work properly in a stateless session (which 
is most likely in his case).

In a stateful session, with multiple fireAllRules and when the 
applicant's properties change between those fireAllRules call,
the trick is to do an insertLogical of a ScoreDiff instead of setScore()
and then add 1 general rule to accumulate all those ScoreDiffs and put 
the resulting score into the Result.

Op 23-11-11 10:56, Michael Anstis schreef:
> Why not use a Fact that contains your result?
>
> In DRL terms it'd look like this:-
>
> rule "one"
>     when
>         $r : Result( $score : score )
>         Applicant( numberOfLoans > 1 )
>     then
>         $r.setScore( $score + 5 );
>         update( $r );
> end
>
> rule "two"
>     when
>         $r : Result( $score : score )
>         Applicant( disposableIncome < 20000 )
>     then
>         $r.setScore( $score + 10 );
>         update( $r );
> end
>
> The result could equally just contain the factors influencing the 
> score with a low salience rule then calculating the final score:-
>
> rule "one"
>     salience 100
>     when
>         $r : Result()
>         Applicant( $nl : numberOfLoans )
>     then
>         $r.setNumberOfLoans( $nl );
>         update( $r );
> end
>
> rule "two"
>     salience 100
>     when
>         $r : Result()
>         Applicant( $di : disposableIncome )
>     then
>         $r.setDisposableIncome( $di );
>         update( $r );
> end
>
> rule "calculate score"
>     salience 200
>     when
>         $r : Result( $nl : numberOfLoans > 1, $di : disposableIncome < 
> 20000 )
>     then
>         $r.setScore( 20 );
>         update( $r );
> end
>
>
> On 23 November 2011 09:44, lansyj <lansyjp at gmail.com 
> <mailto:lansyjp at gmail.com>> wrote:
>
>     hi folks
>
>     We are working on a requirement that requires us to have multiple
>     rules that
>     could fire for a given input and for all the rules that fire, we
>     would want
>     to cumulate the consequence to reach the final consequence.
>
>     As an example, if we want to identify the credit score for a
>     person, based
>     on his gender you might want to assign/increment/decrement the
>     score, then
>     based on nationality, and so on.
>
>     So, considering the long list of such criteria, having rules that
>     cover all
>     scenarios and are still mutually exclusive isnt a scalable
>     solution. Could
>     you please advice on how this could be achieved.
>
>     We run Drools 5.1.1 and Guvnor; rules are made using the guided
>     editor with
>     DSLs.
>
>     Awaiting your support,
>
>     Best Regards
>
>     -lj
>
>     --
>     View this message in context:
>     http://drools.46999.n3.nabble.com/Rules-that-cumulate-on-consequence-tp3530214p3530214.html
>     Sent from the Drools: User forum mailing list archive at Nabble.com.
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-- 
With kind regards,
Geoffrey De Smet

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