Thanks for your reply...could you please tell me what is this myGlobal?

java.util.Set<Rule> myGlobal

2010/10/13 Michael Anstis <michael.anstis@gmail.com>

You could store all rules in a global and remove those that execute in an AgendaEventListener's activtionCreated event (re-adding those that get retracted by Truth Maintenance in the AgendaEventListeners activationCancelled event).

//Loads rules
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("myrules.drl"), ResourceType.DRL);
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
Collection<KnowledgePackage> kpackages = kbuilder.getKnowledgePackages();
kbase.addKnowledgePackages(kpackages);

//Get all rules
for(KnowledgePackage kpackage : kpackages) {
    for(Rule rule : kpackage.getRules()) {
        myGlobal.add(rule);
    }
}

//The usual suspects
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
ksession.addEventListener(new DefaultAgendaEventListener() {
    @Override
    void activationCreated(ActivationCreatedEvent event) {
        myGlobal.remove(event.getActivation().getRule());
    }

    @Override
    void activationCancelled(ActivationCancelledEvent event) {
        myGlobal.add(event.getActivation().getRule());
    }
});

ksession.fireAllRules();

You could also use an AgendaEventListener to better manage the contents of the Rule collection for more complex scenarios where Truth Maintenance could retract an activation - that the simpler solution above wold

2010/10/13 Navdeep Kumar <nkumar@objectwave.com>

Hi All,

I am new to Drools. I am working on a project where nature of rules are dynamic. I want to capture that rule which does not get executed. i need to store that rule because i have to display that rule in the UI.

Here is my rule file

rule "FrontAxle:Capacity|FrontSuspension:Capacity"

when

b:Feature(featureClass.name=="FrontSuspension")
c:Feature(featureClass.name=="FrontAxle")

//eval(b.getCapacity() >= c.getCapacity())

then

System.out.println("These are compatible");
System.out.println(b.getFeatureClass().getName());

availablity.put(b.getFeatureClass().getName()+"-"+c.getFeatureClass().getName(),"12.35");
//availablity.put(b.getName()+"-"+c.getName(),new Double(b.getCapacity()));

insert(availablity);
end

rule "FrontSuspension:Type|FrontAxle:Type"

when

b:Feature(featureClass.name=="FrontSuspension")
c:Feature(featureClass.name=="FrontAxle")

not Feature(b.attributes.Type=="I Beam" && c.attributes.Type=="Multi Link Air")
//NOT (FrontAxle.type = "I-Beam" AND FrontSuspension.type = "Multi-link Air") - mounting restriction

then
System.out.println("I am in 2");
end

rule "FrontAxle:FeatureCode|FrontSuspension:Type"
when

b:Feature(featureClass.name=="FrontSuspension")
Feature(featureClass.name=="FrontAxle" && code=="002ASW")and not Feature(b.attributes.Type=="Multi Link Air" || b.attributes.Type=="Monoleaf Spring")

//FrontAxle.featureCode = "002ASW" AND NOT (FrontSuspension.type = "Multi-link Air" OR FrontSuspension.type = "Monoleaf Spring")

then
System.out.println("I am in 3");
end

now if these two objects named FrontAxle and FrontSuspension are compatible then it has to meet all the 3 rules, but if any combination of these objects does not meet one of the rule listed above then i have to store the rule for the displaying purpose that this combination didn't meet this rule thats why they are not compatible. any kind of help will be appreciated.

Thanks.

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