[rules-users] drl execution problem

[Wolfgang Laun]

You have, say,
   Person( "Joe" )
   Person( "Jim" )

This happens:
   person1 <- match any Person:  (1) match Joe, and (2) match Jim
   person2 <- match any Person name2!=name1: when (1) then match Jim,
when (2) then match Joe

To  avoid this, you can
   (a) retract person2 in  rule "FirstNameDifference"
   (b) add a constraint asserting an ordering between Persons, e.g.,
some unique number
   (c) use compareTo with names, test for -1
   (d) post-process dataDifferenceVO.getDataDiffArray()

-W


On 29/03/2012, arup <arup4u2007 at gmail.com> wrote:
> i have one drl like below:
>
> rule "FirstNameDifference"
> no-loop true
> lock-on-active true
> 	when
> 		person1: Person( $firstName1: firstName )
> 		person2: Person( firstName != $firstName1 )
> 		
> 	then
> 		dataDifferenceVO.getDataDiffArray().add("Person/FirstName");
> end
>
> i'm passing a list of objects in which i have 2 person type objects. my aim
> is to check if the firstnames are same or different. if its different i need
> to add one String to the DataDiffArray that is declared inside
> DataDifferenceVO class.
>
> but as i pass 2 person objects in the WM the rule is getting executed twice.
> i.e, the string "Person/FirstName" is getting added twice in the array list.
> why is this happening?... the rule should compare 2 firstnames and return
> one String...is not that?... what step should i take to achive what i
> want....
> Thanks a lot i advance... :) :) :)
>
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