[rules-users] How to traverse a hierarchy?

[Edson Tirelli]

   In Drools 4 I would use ruleflow to design a flow of groups of rules.

   It sounds like you are implementing a decision tree?!

   []s
   Edson



2009/4/14 Charles Binford <Charles.Binford at sun.com>

> Edson,  Thanks for your reply.  Unfortunately I failed to say I need
> drools 4.0.7 because of its GA status.
> Any suggestions for an approach with drools 4?
>
> Charles Binford
>
> Edson Tirelli wrote:
> >
> >    If I understood correctly, all you need to do (in Drools 5) is to
> > use rule inheritance. Also, in case your "non-leaf" rules have nothing
> > to do in their consequences, you can mark them with attribute "enabled
> > false".
> >
> >
> https://svn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/resources/org/drools/integrationtests/extend_rule_test.drl
> >
> >    So, have rule 1.2 extend rule 1. Have rule 1.2.1 extend rule 1.2
> > and so on. Mark the ones that don't have consequence actions with
> > enabled false just to avoiding creating useless activations. You still
> > need to prioritize rules with salience or whatever you are using for
> that.
> >
> >    That should do the trick. Report back your findings please, as this
> > is a new feature in Drools 5.
> >
> >    Hope it helps,
> >       Edson
> >
> > 2009/4/13 Charles Binford <Charles.Binford at sun.com
> > <mailto:Charles.Binford at sun.com>>
> >
> >     All,  I'm trying to figure out a better way to solve this problem.  I
> >     have a batch of objects that I want matched against a hierarchy of
> >     rules.  I check the rules in order, and as soon as I find a match I'm
> >     done for that level of the hierarchy.  In other words, If the object
> >     matches a rule, we'll check the rules children, but not the siblings.
> >     Example:
> >
> >     rule 1
> >      rule 1.1
> >      rule 1.2
> >        rule 1.2.1
> >        rule 1.2.2
> >      rule 1.3
> >     rule 2
> >
> >     If an object matches rule 1, check for a match at level "1.*", but
> >     rule
> >     2 will never be checked.  If an object matches 1, 1.2, and 1.2.1,
> >     we're
> >     done as 1.2.1 has no children.
> >
> >     My current implementation with drools works, but is very
> >     inefficient.  I
> >     have a "level" string in the objects and whenever I find a match I
> >     update the level of the object and force an object update.  Each rule
> >     tests that the level string is correct, e.g. rule 1.2.1 works as
> >     follows:
> >     rule "1.2.1"
> >     when
> >        obj(level matches "1.2.*",.....)
> >        ...
> >     then
> >        objSetLevel("1.2.1.*");
> >        ....
> >     end
> >
> >     I'm also using saliance to keep the evaluation order like I want it.
> >
> >     Changing the contents of the object and doing the update is not
> >     good for
> >     drools performance as I understand it so I'm looking for a better
> way.
> >     The hierarchy and the order of the matching is key to my
> >     application so
> >     I'm not wanting to redesign that part of things.
> >
> >     I tried using activation-groups.  That worked great as long as I only
> >     had a single object to run through the hierarchy, but given the
> >     way the
> >     rest of the system is design I need to load up 10-100 objects before
> >     each call to fireallrules() for performance purposes.
> >
> >     Any suggestions are appreciated.
> >
> >     Charles Binford
> >
> >
> >     _______________________________________________
> >     rules-users mailing list
> >     rules-users at lists.jboss.org <mailto:rules-users at lists.jboss.org>
> >     https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> >
> > --
> >  Edson Tirelli
> >  JBoss Drools Core Development
> >  JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
> > ------------------------------------------------------------------------
> >
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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