[rules-users] Update function usage for java objects to be retrieved for database update

[Travis_Smith at bnz.co.nz]

OK: If your rules are looping, it suggests that you may have written them 
badly. (EG:

rule rule1
when
        ObjectA ( $property : property==null )
then 
        $property = 12;
        update (ObjectA);
end

rule rule2
when
        ObjectA ( $property : property!=null )
then 
        $property = null;
        update (ObjectA);
end

Try breaking things down into Ruleflow Groups so that each logically 
separated section  leads into the next.

Another way of handling this is do not have Update calls in your rules.

Instead I attach listeners to each part of the fact model - the listeners 
call Update for me.

If I want to prevent loops? I simply disable the listeners.

On the current project I'm doing I've done a combination of both of these, 
and it works well.

I hope this helps,
-Trav

Travis Smith
Analyst Programmer
Development Centre
BNZ

DDI: +644 4746356 (Or Ext 76356)





dbfree75 <wbismuth at yahoo.fr>
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25/05/2011 11:55 a.m.
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Subject
Re: [rules-users] Update function usage for java objects to be retrieved 
for database update




I'm still using such solution .
Here an example of rule where I nees to set the
originalPropertyValuationLoan :

rule "OriginalPropertyValuationLoan - NbSecuredGaranteeUnderLoan >= 1 -
garantee H - postCode equivalent - initialValue equivalent"
no-loop
salience 970
dialect "mvel"
    when

                                 $controlFact : ControlFact(phase == 
"INITIAL")
                                 $loanEvaluated  : 
loanEvaluated(nbSecuredGaranteeUnderLoan >= 1,
originalPropertyValuationLoan == null)
                                 $loan : loan() from $loanEvaluated.loan
                                 $garantee : garantee(typegarantee.code == 
"H" , initialValue != null) from
$loan.garantees
        $postCodes : Set(size == 1)
                     from accumulate(
                                     garantee(typegarantee.code == "H", $n 
:
postCodeInGarantee) from $loan.garantees,
                                     collectSet($n)
                                     )
        $garantees : Set(size == 1)
                     from accumulate(
                                     garantee(typegarantee.code == "H" ||
typegarantee.code == "O", $n : typegarantee.code) from $loan.garantees,
                                     collectSet($n)
                                     )
        $initialValue : Set(size == 1) 
                                    from accumulate(
 
garantee(typegarantee.code == "H", $n : initialValue ) from 
$loan.garantees,
                                                    collectSet($n)
                                                    )
   then
                 $loanEvaluated.originalPropertyValuationLoan = 
$garantee.initialValue
                 update($loanEvaluated)
                 #System.out.println("OriginalPropertyValuationLoan -
NbSecuredGaranteeUnderLoan > 1 : " +
$loan.loanEvaluated.originalPropertyValuationLoan);
end

In case this rule isn't fired because any of these conditions isn't set, 
on
update after any other property has been set  this rule will be fired 
again 


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