[rules-users] Complexity Conflict Resolver not working as expected

[Wolfgang Laun]

Two other ways to achieve what's wanted:

(1) Retract the fact on the RHS of the matching rule.
(2) Add a boolean attribute a to the fact, add a constraint a == false
and modify the fact on the RHS of the matching rule, setting a to true.

-W

On 26 March 2012 15:58, FrankVhh <frank.vanhoenshoven at agserv.eu> wrote:

> Hi,
>
> To my knowledge, conflict resolvers are only used to determine priority of
> rule activations. It does not prevent rules from firing.
>
> You should be able to get the behavior you want by adding
> activation-groups.
> In an activation group, only one rule can fire. See documentation.
>
> Regards,
> Frank
>
>
> vanithap wrote
> >
> > I have 3 rules
> >
> > R1 - state=GA, policy type = Home Owner, Rating program  = Standard, then
> > print a
> > R2 - State=GA, Rating Program = Standard, then print b
> > R3 - State=GA, then print c
> >
> > Now I insert the fact with state = GA, policy = HOwner, rating program =
> > Standard,
> > it matches on all the above 3 rules.
> >
> > So I wrote my own ComplexityConflictresolver so only one rule should fire
> > based on the most matched conditions. But it is firing all the above
> three
> > rules.
> >
> > This is the piece of code I have in complexity resolver
> >
> > public int compare(Activation lhs,
> >                        Activation rhs)
> >     {
> >         Rule lhsRule = lhs.getRule();
> >         int numLhsConstraints = getNumConstraintsForRule(lhsRule);
> >
> >         Rule rhsRule = rhs.getRule();
> >         int numRhsConstraints = getNumConstraintsForRule(rhsRule);
> >
> >         //return numRhsConstraints - numLhsConstraints;
> >
> >         if ( numLhsConstraints > numRhsConstraints ) {
> >             return 1;
> >         } else if ( numLhsConstraints < numRhsConstraints ) {
> >             return -1;
> >         } else {
> >             return 0;
> >         }
> >     }
> >
> >     private int getNumConstraintsForRule(Rule rule)
> >     {
> >         int numConstraints = 0;
> >
> >         Declaration[] declarations = rule.getDeclarations();
> >         for (Declaration declaration : declarations)
> >         {
> >             List constraints = declaration.getPattern().getConstraints();
> >             if (null != constraints)
> >             {
> >                 numConstraints += constraints.size();
> >             }
> >         }
> >         return numConstraints;
> >     }
> >
> >
> >
> > This is the piece of code where I hook in the resolver
> >         RuleBaseConfiguration configuration = new
> RuleBaseConfiguration();
> >
> >         ConflictResolver[] conflictResolvers = new ConflictResolver[] {
> >
> > com.test.rulesengine.conflict.ComplexityConflictResolver.getInstance()
> >         };
> >         CompositeConflictResolver resolver = new
> > CompositeConflictResolver(conflictResolvers);
> >         configuration.setConflictResolver(resolver);
> >
> >
> >         KnowledgeBase knowledgeBase =
> > KnowledgeBaseFactory.newKnowledgeBase(configuration);
> >
> >
> > It looks like it is adding all three activations to Agenda and firing
> each
> > one of them.
> >
> > What am I doing wrong. Any help will be appreciated.
> >
> > Thanks
> >
>
>
> --
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> http://drools.46999.n3.nabble.com/Complexity-Conflict-Resolver-not-working-as-expected-tp3851854p3858196.html
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