[rules-users] How to update the working memory of a nested object attribute

[Wishing Carebear]

Thanks Swindel.
The eligibilityScore is updated on 3 different rules by decrementing the
value if the condition is satisfied. Finally the eligibilityScore value is
used in the downstream. Is there any pattern available for these types of
use cases.



2011/7/6 Swindells, Thomas <TSwindells at nds.com>

>  You need a way to differentiate between policy’s that have been updated
> and that haven’t been updated.****
>
> If you have control of your model then you could add an extra field, either
> as a flag or containing the new value – if this field is null you know you
> need to update it.****
>
> If you can’t change that part of the model you can introduce a new class
> PolicyUpdated(Service policy). When you update the policy you insert one of
> these. You then change your conditions to add “not PolicyUpdated(policy ==
> $policy)” which will then stop you retriggering yourself. Finally you need
> to tell drools that you have modified Client.****
>
> It may be more efficient to actually fetch and insert the policy service
> objects into the working memory, then you only need to tell drools/your
> rules that you have updated one small part of your rules rather than getting
> it to reiterate over all the services every update.****
>
> ** **
>
> Thomas****
>
> ** **
>
> ** **
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Wishing Carebear
> *Sent:* 06 July 2011 04:47
> *To:* Rules Users List
> *Subject:* [rules-users] How to update the working memory of a nested
> object attribute****
>
> ** **
>
> Hi,
> My rules update the nested object attributes :eligibilityScore which is
> used in another rule downstream.
>
> Only the Client object is sent as fact, the nested object is derived using
> the from keyword (list of services)
>
> rule  "Rule 8 EligibilityRating"
>     agenda-group  "EligibilityRating"
>     no-loop true
>     salience 5
>     //dialect  "mvel"
>     when
>         $client : Client(type == "Preferred")
>         $policy : Service(productType == "Vehicle Insurance") from
> $client.service
>     then
>         System.out.println(" Rule 8 ER = type == preferred:"+
> $policy.getId() + ": -50");
>         int eScore = $policy.getEligibilityScore() - 50;
>        * $policy.setEligibilityScore(eScore);* // how to let the
> downstream rule know that this atribute value is updated without letting
> this current rule go into infinite loop
> end
>
> Any suggestion is greatly appreciated****
>
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>
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