[rules-users] Rule Reuse Best Practice

[Jason Davidson]

Thanks for the reply.  I was hoping to avoid refactoring the fact objects.

2009/12/15 Edson Tirelli <ed.tirelli at gmail.com>

>
>    2 ways:
>
> 1. If you have a common superclass/interface for your objects and the
> superclass/interface has the method to return your dln, just make use of
> inheritance:
>
> when
>     MyDTOInterface( dln not matches "^.{5,15}$")
> then
>    // do something
>
> 2. If you want to use composition instead, make dln a top level fact:
>
> when
>    DLN( id not matches "^.{5,15}$")
> then
>    // do something
>
>    Edson
>
> 2009/12/15 Jason Davidson <jljdavidson at gmail.com>
>
>> Hello,
>>
>> What is the best practice for reusing rules?  I've got a license number
>> validation rule that I need to reuse for different fact types.  For example,
>> the first rule uses the license number in a CitationDTO fact:
>> rule "Citation DL Number"
>>    ruleflow-group "CitationEntryValidationFlow"
>>     when
>>         CitationDTO($dln :
>> citationSubject.driverLicense.driverAuthorizationId not matches "^.{5,15}$")
>>     then
>>         resultHolder.setMessage(GenericCitationFieldIds.DLN,"DLN [{0}]
>> must be at least 5 characters long and no more than 15 characters long.",
>> new Object[]{$dln});
>> end
>>
>> Then I have another rule that uses the license number from the
>> InCourtSearchDTO:
>> rule "InCourt DL Number"
>>     ruleflow-group "InCourtSearchValidationGroup"
>>     when
>>         InCourtSearchDTO( $d : dln not matches "^.{5,15}$")
>>     then
>>         resultHolder.setMessage(UserLogonFieldIds.END_DT,"DLN [{0}] must
>> be at least 5 characters long and no more than 15 characters long.", new
>> Object[]{$d});
>> end
>>
>> Obviously this is a poor implementation because the license number check
>> 'not matches "^.{5,15}$"' is duplicated.  Is there a way I can reuse this
>> rule?
>>
>> Thanks!
>>
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>>
>>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss by Red Hat @ www.jboss.com
>
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