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

[Wolfgang Laun]

As an alternative, use different classes for the parameter containers. There
could be one called Ssn (just ssn), one SsnCitizen, etc.

    SsnCitizen( $ssn : ssn, $citizenship : citizenship )
    Person( ssn = $ssn, citizenship == $citizenship )

Be careful, though, and DO NOT make SsnCitizen a subclass of Ssn. The
parameter classes you use must be on the same inheritance level.

-W

2011/10/20 Michael Anstis <michael.anstis at gmail.com>

> 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?
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/externalization-of-input-constraints-in-a-rule-tp3435495p3435834.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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>
>
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