Re: [rules-users] Shadow facts

I think I was not clear in my note. I used dynamic facts with Drools 4.07 but am migrating to Drools 5, where there is no longer a second argument to the insert method. My POJOs do have property change listeners.

Here is an example rule that activates but never apparently fires: rule "Detect insulin on" dialect "java" when decision : GlucoseDecision(currentInsulinDripRate > 0) decisionState : GlucoseDecisionState( insulinOn == false ) then decisionState.setInsulinOn(true); end The relevant method that is called on the RHS: public void setInsulinOn(boolean insulinOn) { boolean oldValue = this.isInsulinOn(); this.insulinOn = insulinOn; firePropertyChange("insulinOn", oldValue, insulinOn); } The eventual call is to fireRules which then calls executeRules in a callback. Previously, I had a Boolean argument to the insert statements and all the code worked with the old RuleBase, RuleAgent objects. But since changing to KnowledgeSession, the rules do not appear to fire. Here are the relevant methods: public void executeRules(WorkingEnvironmentCallback callback) { StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); callback.initEnvironment(ksession); ksession.fireAllRules(); ksession.dispose(); } public void fireRules(final GlucoseDecision glucoseDecision, final GlucoseDecisionState decisionState) { rulesEngine.executeRules(new WorkingEnvironmentCallback() { public void initEnvironment(StatefulKnowledgeSession workingMemory) { workingMemory.insert(glucoseDecision); workingMemory.insert(decisionState); } }); } > > Message: 2 > Date: Wed, 11 Feb 2009 10:26:06 -0500 > From: Edson Tirelli <tirelli(a)post.com <mailto:tirelli@post.com>> > Subject: Re: [rules-users] Shadow facts > To: Rules Users List <rules-users(a)lists.jboss.org > <mailto:rules-users@lists.jboss.org>> > Message-ID: > <e6dd5ba30902110726t2b09ee9dtdc7e85ed4217f80a(a)mail.gmail.com > <mailto:e6dd5ba30902110726t2b09ee9dtdc7e85ed4217f80a@mail.gmail.com>> > Content-Type: text/plain; charset="iso-8859-1" > > Dean, > > There are two unrelated things in here... the boolean flag for dynamic > facts means your fact supports the property change listeners and you > don't > need to call modify() when you change an attribute. ShadowFacts are a > complete different thing that should be mostly transparent to users. > If you can provide an example, it will be easier to help you. > > []s > Edson > > 2009/2/11 J Michael Dean <mdean77(a)comcast.net > <mailto:mdean77@comcast.net>> > >> I am migrating from 4.07 to 5 and my previous DRL file does not function >> correctly; I previousliy inserted facts with the dynamic Boolean >> set true. >> I understand that this is no longer done because shadow facts are "not >> needed" in Drools 5, but is it necessary to do anything different in >> the RHS >> when modifying facts? My fact POJOs have a method for adding text to >> themselves. I believe my rules are not working properly because >> nothing is >> being modified - only the initial activation set fires and then nothing >> happens. >> >> Restated, the documentation talks about how to "avoid" shadow facts in >> Drools 4.07 - are the restrictions in this part of the docs necessary in >> Drools 5? >> >> Thanks. >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> >> https://lists.jboss.org/mailman/listinfo/rules-users >> ------------------------------------------------------------------------ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users