[rules-users] Question about managing working memory facts

[Edson Tirelli]

   If you know what is the timestamp attribute, you can even write a rule...
:)

rule "garbage collect"
    salience 100 // use a reasonable salience
when
    $e : Event( $ts : timestamp )
    not Event( timestamp < $ts )
    Number( intValue > 1000 ) from accumulate(
          $c : Event(),
          count( $c ) )
then
    $retract( $e );
end

   Not sure if it is the best way, but should work... :)

   []s
   Edson

2008/2/19, Zoltan Farkas <zoly at daxtechnologies.com>:
>
>  I am looking to implement a system that has as facts "events" that happen
> randomly.
>
>
>
> How is the best way to implement a "garbage collection" mechanism that if
> the number of "events" in the working memory reaches a limit value will
> retract the oldest event/s…
>
>
>
> Thanks
>
>
>
> --zoly
>
>
>
>
>
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>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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