[rules-users] externalization of input constraints in a rule

[Michael Anstis]

The same principle applies, but instead of inserting a single SSN container,
you insert a generic "parameters" container:-

rule "rule 1"
when
    Parameters( rule == "rule 1", $ssn : ssn, $citizenship : citizenship )
    Person( ssn = $ssn, citizenship == $citizenship )
then
    ....

If your parameters are more generic Parameters could contain a Map instead
of explicit parameters and change the Person pattern accordingly.

It'd be good to be able to extract the rule name in the LHS, but I don't
think this is possible (anybody?)

Cheers,

Mike

On 19 October 2011 22:35, bharath87 <craze.stuff at gmail.com> wrote:

> Hi Michael,
>              Thanks for your reply... consider the situation where there
> are lot of rules each of which might or might not have unique input
> contraints..
>
> for e.g.
>
> rule "Rule1"
>
>     when
>            Person ( ssn == "input1" )
>     then
>            .....
>
> end
>
> rule "Rule2"
>
>    when
>           Person ( ssn == "input2" and citizenship == "inputCountry" )
>    then
>          .....
> end
>
> In the above scenario the ssn input for Rule1 differs from the ssn input
> for
> Rule2, if i use SSN() facts i will have the rules fire for each ssn facts
> present in the working memory.
>
> what do i do?
>
> --
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> http://drools.46999.n3.nabble.com/externalization-of-input-constraints-in-a-rule-tp3435495p3435834.html
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