Hello, I have a class and rule: class CTestObj { private double value; void setValue(double v) { this.value = v; } double getValue() { return this.value; } } rule "r1" when p : CTestObj then p.setValue( 1 / p.getValue() ); end As you can see, in this rule, there is risk, to put into stateFulSession object with value set 0. I can't validate this, because, this problem has a variation where I put into stateFulSession object with set no 0, but the rule will modify it... So - I can't validate this = fact with value 0 is correct. But I process with stateFulSession many, many facts... For example 1000. And, after 900 facts it occurs, that fact number 901 has value set on 0. In effect I get an exception: org.drools.runtime.rule.ConsequenceException: java.lang.ArithmeticException: / by zero. And ksession stops processing facts. But, 900 facts are processed! I don't want to process them second time. And this is my question: How can I know, which fact is first no-processed fact? Which one stoped fireAllRules method? Beacuse I don't want to process them another time. Greetings :) tom. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hello, I think you understood me. Your solution is to validate facts in the rule. OK - I think this is a good idea, but... What if rules are created by no-IT (no-Math-aware ;) ) people? I can imagine situation where they do not validate this issue (div by 0). What then? If I send 1000 facts to ksession, and 901 has value set to 0? I want my 900 correct facts back. How can I know, how many have been processed? P.S. I don't want to use globals to count this. Thanks, tom. 2010/8/31 Edson Tirelli <tirelli(a)post.com&gt; > >    I am not sure I understand your problem. The rule clearly should NOT > match facts with value 0, as it will raise division by zero error all the > time. So, the solution, in my mind is: > rule "r1" >     when >         p : CTestObj( value != 0 ) >     then >         p.setValue( 1 / p.getValue() ); > end > >    If you need to give a different treatment to objects with value == 0, > just add another rule for them. >    []s >    Edson > > 2010/8/31 tom ska <tiberium.linux(a)gmail.com&gt; >> >> Hello, >> I have a class and rule: >> >> class CTestObj >> { >>         private double value; >> >>         void setValue(double v) { >>                 this.value = v; >>         } >> >>         double getValue() { >>                 return this.value; >>         } >> } >> >> rule "r1" >>     when >>         p : CTestObj >>     then >>         p.setValue( 1 / p.getValue() ); >> end >> >> As you can see, in this rule, there is risk, to put into stateFulSession >> object with value set 0. I can't validate this, because, this problem has a >> variation where I put into stateFulSession object with set no 0, but the >> rule will modify it... >> So - I can't validate this = fact with value 0 is correct. >> >> But I process with stateFulSession many, many facts... For example 1000. >> And, after 900 facts it occurs, that fact number 901 has value set on 0. In >> effect I get an exception:  org.drools.runtime.rule.ConsequenceException: >> java.lang.ArithmeticException: / by zero. And ksession stops processing >> facts. But, 900 facts are processed! I don't want to process them second >> time. >> And this is my question: >> >> How can I know, which fact is first no-processed fact? Which one stoped >> fireAllRules method? >> Beacuse I don't want to process them another time. >> >> Greetings :) >> tom. >> >> >> >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > > > -- >   Edson Tirelli >   JBoss Drools Core Development >   JBoss by Red Hat @ www.jboss.com > > _______________________________________________ > rules-users mailing list > rules-users(a)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