[rules-users] Re-insert modified instance of same fact and Truth maintenance

[Mark Proctor]

On 24/05/2011 09:51, Abhay B. Chaware wrote:
>
> Could be a basic question, but thought I should get clarified.
>
> I insert a fact say, a Computer object with some attributes ( hdd=10GB 
> ) set, in working memory. Then I have a rule that checks if a Computer 
> with 10GB hdd is inserted .. if yes, then it does a logicalInsert of 
> an Alert object with computerId = this computer's id.
>
> Now I would like to re-insert the same fact with HDD changed to '20gb' 
> and would like drools to automatically retract the Alert for this 
> computerId .. how do I achieve this ?
>
logical insertions are immutable. The act of calling "modify" will state 
the fact, losing all justifications.

Mark
>
> -abhay
>
>
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