[rules-users] drools design question

[Swindells, Thomas]

Actually what you want is that only the rules from the DRLs that you want are activated and their consequences run (a subtle but important distinction). Put another way it doesn't matter how many rules are in the knowledge base and evaluated as long as only the rules you want are matched.

There are two main approaches you could do to control this. The first is to use agenda groups with rules in different DRLs being in different agenda groups, this then lets you control which groups consequences are run and in what order to.

Another approach is to introduce some additional facts into the working memory - "EnabledRuleGroup(String groupName)". The first condition in each rule would then be the statement "exists EnabledRuleGroup(name =="myDlrFilenameXYZ")
Then only rules matching the statement would be evaluated.

There are probably other variations around this too - things like agenda filters to filter out the activations you don't want.

Thomas



> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of marunam
> Sent: 17 March 2011 13:31
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] drools design question
>
> Thanks everyone for your inputs
>
> Yes, so the confusion that I have is, with loading multiple drls. If I
> load
> all the drls in memory(may be 100s), does it mean that when I say
> fireallRules, it is going to run the rules from all the drls?? That is
> what
> I don't want.
>
> For a particular session at runtime, I may need to run drls from just
> some
> specific drls and not all the drls. How can I tackle this If I load all
> the
> drls?
>
> Thank you
>
> --
> View this message in context: http://drools-java-rules-
> engine.46999.n3.nabble.com/drools-design-question-
> tp2691182p2693429.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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