I think that a single helper class class Marker { String property; Object target; } would be sufficient: // 1st consequence insert( new Tag( "London", customer ) );
// 2nd condition Tag( property == "London", $target : target ) Customer( this == $target, job == "teacher" ) You may need to have a strategy for retracting obsolete Tag facts. -W 2010/10/19 Dominik Hüttner <d.huett...@tiq-solutions.de>: > Hi Leonardo, > > the performance problem I thought of meant removing and inserting the facts > again and again, if I would remove the facts, that don’t fit the first rule > and execute the second rule only on the remaining facts. > > The solution you offered, does, what I intend, but the problem is, that I > have to create a new class for every rule-pair and I want to use it > flexible, without having to create a new class / model for every rule. Is > there maybe another way to solve this problem? > > > > Kind regards, > > > > Dominik > > > > > > > > Von: rules-users-boun...@lists.jboss.org > [mailto:rules-users-boun...@lists.jboss.org] Im Auftrag von Leonardo Gomes > Gesendet: Dienstag, 12. Oktober 2010 16:37 > An: Rules Users List > Betreff: Re: [rules-users] Get rid of redundant conditions in combined > rules. > > > > If your problem is performance, don't worry. Conditions evaluation is > shared, so in the second rule you won't re-evaluate the entire working > memory (to know more:http://www.drdobbs.com/184405218). > > If you're worried about not having to repeat the conditions on the second > rule, I would create inferred facts when the first rule matches and use then > in the second rule + the additional conditions. > > Something like: > > Rule1: > > when > > customer:Customer(town=="London") > > then > > insert new LondonCustomer( customer ); > > > > Rule2: > > when > > london : LondonCustomer(customer.job=="TEACHER") > > then > > System.out.println(london.customer.getLname() + " is a > teacher"); > > > > 2010/10/12 Dominik Hüttner <d.huett...@tiq-solutions.de> > > Hello everyone, > > I’ve got a question. I’m using drools-guvnor to execute some rule-scenarios. > I have to solve the following problem: I have an amount of objects in my > working memory and can’t remove objects from the working memory in the > then-part of the rule. I want to combine two rules, the first rule selects > some objects and the second rule checks only these selected objects for > additional criteria. I have to use two rules, because I want to report the > objects selected in the first rule, too. Now I have implemented this with > two rules and in the second rule, the criterias of the first rule are copied > to the second rule, my question is, is there a way to get rid of this > redundandance? > > I have tried this with a rule flow, but the problem is, this always works on > the whole working memory, but I can’t remove the not used objects from > working memory for performance reasons. Is there another way to solve this > problem? > > > > Here is an example for what I intend to do: > > > > Rule1: > > when > > customer:Customer(town=="London") > > then > > System.out.println(customer.getLname() + " is inhabitant of > London"); > > > > Rule2: > > when > > customer:Customer(town=="London",job=="TEACHER") > > then > > System.out.println(customer.getLname() + " is a teacher"); > > > > This example illustrates, with the first rule I want to get to know, how > many customers are from London and in the second rule I want to know, how > many of the London customers are teachers. I want to create a kind of > statistics. I have quite a lot of conditions for the first rule, so I don’t > want to have them redundantly. > > > > Greetings, Dominik > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users