February 2007 - rules-users - Jboss List Archives

RE: [rules-users] accumulate / collect behaviour question - anoth er stupid question

by Olenin, Vladimir (MOH)

> So, you are right: action will be executed 10 times for each id and eval > will be executed 1 time for each id. Hmm... So, the 'action' part of the _rule_ (NOT of the accumulate statement) will be called 100 times? How should the rule be modified for the action to be called only 10 times? (once per each unique transaction id). Basically the idea is to do smth if all debit operations are not balanced with credit operations within the same transaction id.... Or have I misunderstood -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 21 February 2007 17:19 To: Rules Users List Subject: Re: [rules-users] accumulate / collect behaviour question - another stupid question Vlad, Inside an accumulate CE, the action code will be executed once for each match of the given pattern (TransactionEntry in this case). Eval CEs are executed once for each tuple that matches all previous patterns. So, you are right: action will be executed 10 times for each id and eval will be executed 1 time for each id. To understand better how forward rule engines work, there are some books and articles listed in JBoss Rules project page. I can personally recomend "Expert Systems..." by Gary Riley. And don't worry about asking. Usually people ask a lot in the begining and then when they feel confident, they start to answer more than ask. :) []s Edson Olenin, Vladimir (MOH) wrote: > Hi, > > Edson quoted the following sample rule some time ago: > > rule "transaction consistency" > > when > > Transaction( $id : id ) > > $credits: Double( ) > > from accumulate( TransactionEntry( id == $id, operation == "credit", > $amount : amount ), > > init( double balance = 0 ), > > action( balance += $amount ), > > result( new Double( balance ) ) ); > > $debits: Double( ) > > from accumulate( TransactionEntry( id == $id, operation == "debit", > $amount : amount ), > > init( double balance = 0 ), > > action( balance -= $amount ), > > result( new Double( balance ) ) ); > > eval( ! $credits.equals( $debits ) ) then > > // inconsistency for transaction $id > > End > > If there are 100 transactions overall and only 10 unique transaction > ids (eg, id = 1..10), so that we have on average 10 Transaction facts > per id, > > - how many times will 'eval' be called? > > - how many times will the action be called, assuming 'eval' always > returns 'true'? > > I guess the answer for the above should be '10 times', once per each > id? What if I put another eval statement like "eval($id == 1)" after > existing 'eval'? Would that be evaluated 100 times (for all > Transaction facts) or only 10 times (once per unique id)? > > I think I'm missing quite significant piece on how tuples are selected > in DROOLS and how 'eval' and new 'from accumulate' features work.... Any > pointers would be greatly appreciated! (would some general literature > on rule engines help to clear up this types of questions?...) > > Thanks, > > Vlad > > PS: sorry for posting so many questions and answering so few..... > >------------------------------------------------------------------------ > >_______________________________________________ >rules-users mailing list >rules-users(a)lists.jboss.org >https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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NPE when retracting the objects in working memory...

by Reddy Ramesh-in2259c

Hi, I am getting null pointer exception when i retract objects from working memory. please help me in resolving this problem.... my rule goes like this... package com.moto.nms import com.moto.nms.Event; import com.adventnet.nms.topodb.ManagedObject; import com.motorola.nmatg.nms.topology.ManagedEntity; global com.moto.nms.Consecutive con; // Consecutive is an simple class file which has two simple methods, getValue() and setValue(). rule "duplicate" salience 29 when e1 : Event( firsttime1 : time , severity1 : severity == 1 ) e2 : Event( firsttime2 : time > firsttime1 , severity == severity1 ) not Event( severity == -1 , time > firsttime1 , time < firsttime2) then System.out.println("matched the fact"); e1.setCompressionStatus("compress_"+con.getValue()); e2.setCompressionStatus("compress_"+con.getValue()); end rule "duplicate_x" salience 29 when e1 : Event(firsttime1 : time , severity == 1 ) e2 : Event(firsttime2 : time > firsttime1 , severity == 1) exists Event( severity == -1, time > firsttime1 , time < firsttime2) then System.out.println("matched 2nd fact"); con.setValue(con.getValue() +1); end exception is like this... Caught Exceptionjava.lang.NullPointerException java.lang.NullPointerException at org.drools.reteoo.beta.DefaultRightMemory.remove(Unknown Source) at org.drools.reteoo.BetaMemory.remove(Unknown Source) at org.drools.reteoo.NotNode.retractObject(Unknown Source) at org.drools.reteoo.ObjectSource.propagateRetractObject(Unknown Source) at org.drools.reteoo.RightInputAdapterNode.retractTuple(Unknown Source) at org.drools.reteoo.TupleSource.propagateRetractTuple(Unknown Source) at org.drools.reteoo.NotNode.retractTuple(Unknown Source) at org.drools.reteoo.TupleSource.propagateRetractTuple(Unknown Source) at org.drools.reteoo.JoinNode.retractTuple(Unknown Source) at org.drools.reteoo.LeftInputAdapterNode.retractObject(Unknown Source) at org.drools.reteoo.ObjectSource.propagateRetractObject(Unknown Source) at org.drools.reteoo.AlphaNode.retractObject(Unknown Source) at org.drools.reteoo.ObjectSource.propagateRetractObject(Unknown Source) at org.drools.reteoo.ObjectTypeNode.retractObject(Unknown Source) at org.drools.reteoo.Rete.retractObject(Unknown Source) at org.drools.reteoo.ReteooRuleBase.retractObject(Unknown Source) at org.drools.reteoo.ReteooWorkingMemory.doRetract(Unknown Source) at org.drools.common.AbstractWorkingMemory.retractObject(Unknown Source) at org.drools.common.AbstractWorkingMemory.retractObject(Unknown Source) at com.moto.nms.TestEvents3.retractAll(TestEvents3.java:219) at com.moto.nms.TestEvents3.readRule(TestEvents3.java:158) at com.moto.nms.TestEvents3.main(TestEvents3.java:242) TestEvents3.java class is like this.... package com.moto.nms; //related to IO.. import java.io.InputStreamReader; import java.io.Reader; import java.io.InputStream; import java.util.List; import java.util.Iterator; //related to Drools.. import org.drools.RuleBase; import org.drools.RuleBaseFactory; import org.drools.compiler.PackageBuilder; import org.drools.rule.Package; import org.drools.WorkingMemory; import org.drools.FactHandle; import org.drools.FactException; import com.moto.nms.Event; import com.moto.nms.NMSEvent; import com.moto.nms.TopoInterface1; import com.moto.nms.GenerateEvents; import com.adventnet.nms.topodb.ManagedObject; import com.moto.nms.Consecutive; public class TestEvents3 { private Reader reader; private RuleBase rulebase; private WorkingMemory wm; private List factHandles; public TestEvents3(){ } public void readRule(String readername) throws Exception{ InputStream str = null; str = TestEvents.class.getResourceAsStream(readername); if(str == null) { System.out.println("unable to read rule file"); return; } reader = new InputStreamReader(str); //read in the source PackageBuilder builder = new PackageBuilder(); //building up the rule package builder.addPackageFromDrl(reader); Package pkg = builder.getPackage(); //get the compiled package rulebase = RuleBaseFactory.newRuleBase(); rulebase.addPackage( pkg ); //adding the package to the rule base Consecutive con = new Consecutive(); wm = rulebase.newWorkingMemory(); wm.setGlobal("con", con); System.out.println("\n\n"+System.currentTimeMillis()); Event ev1 = new Event(183, 1, "port02", "LOS", System.currentTimeMillis()); //Thread.sleep(450); Event ev9 = new Event(192, 1, "port02", "LOS", System.currentTimeMillis()); //Thread.sleep(400); Event ev10 = new Event(307, 1, "port02", "LOS", System.currentTimeMillis()); Thread.sleep(500); Event ev11= new Event(306, 1, "port02", "LOS", System.currentTimeMillis()); Thread.sleep(200); Event ev12= new Event(305, 1, "port02", "LOS", System.currentTimeMillis()); Thread.sleep(250); Event ev13= new Event(304, -1, "port02", "LOS", System.currentTimeMillis()); Thread.sleep(600); Event ev14= new Event(302, 1, "port02", "LOS", System.currentTimeMillis()); Thread.sleep(200); Event ev15= new Event(301, 1, "port02", "LOS", System.currentTimeMillis()); Thread.sleep(200); Event ev16= new Event(308, 1, "port02", "LOS", System.currentTimeMillis()); wm.assertObject(ev1); wm.assertObject(ev9); wm.assertObject(ev10); wm.assertObject(ev11); wm.assertObject(ev12); wm.assertObject(ev13); wm.assertObject(ev14); wm.assertObject(ev15); wm.assertObject(ev16); System.out.println("\n\n"+System.currentTimeMillis()); System.out.println("\n\nFiring rules...\n"); wm.fireAllRules(); factHandles = wm.getObjects(); System.out.println("\n\nAll the Objects in WOrking Memory are as Follows...\n"); for(int i=0; i<factHandles.size(); i++) { System.out.println(factHandles.get(i)); } System.out.println("The CompressionStatus of the events are..."); System.out.println(ev1.getCompressionStatus()); System.out.println(ev9.getCompressionStatus()); System.out.println(ev10.getCompressionStatus()); System.out.println(ev11.getCompressionStatus()); System.out.println(ev12.getCompressionStatus()); System.out.println(ev13.getCompressionStatus()); System.out.println(ev14.getCompressionStatus()); System.out.println(ev15.getCompressionStatus()); System.out.println(ev16.getCompressionStatus()); System.out.println("The DeletionStatus of the events are..."); System.out.println(ev1.getDeletionStatus()); System.out.println(ev9.getDeletionStatus()); System.out.println(ev10.getDeletionStatus()); System.out.println(ev11.getDeletionStatus()); System.out.println(ev12.getDeletionStatus()); System.out.println(ev13.getDeletionStatus()); System.out.println(ev14.getDeletionStatus()); System.out.println(ev15.getDeletionStatus()); System.out.println(ev16.getDeletionStatus()); Thread.sleep(1000); System.out.println("Starting retracting...."); Thread.sleep(1000); retractAll(); System.out.println(System.currentTimeMillis()); } public void retractAll() { factHandles = wm.getFactHandles(); Iterator itr = factHandles.iterator(); if(factHandles == null) { System.out.println("invalid FactHandler List"); return; } System.out.println("size of fact handles..:"+factHandles.size()); while(itr.hasNext()) { try{ FactHandle fh = (FactHandle)itr.next(); if(fh == null) System.out.println("Here object is null, Cannot be retracted"); else { wm.retractObject(fh); System.out.println("Retracted object : "+ fh); } }catch (FactException e){ e.printStackTrace(); } } return; } public static void main(String[] args){ TestEvents3 te = new TestEvents3(); try{ te.readRule("/AlarmSuppression.drl"); }catch(Exception ex){ System.out.println("Caught Exception" +ex); ex.printStackTrace();} } }

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RE: [rules-users] Problems with Decision Table

by Grimshaw, Jeffrey

Hi Heli. I was doing something similar in a DT and it took ages to figure it out. I was trying to compare dates from two different bound objects. I wanted to know if one date was later than the other. To compund the problem, the value in the condition cell (the user editable part) needed to be true or false. I ended up putting the whole thing in an eval() statement like this: eval(obj1.getDate().before(obj2.getDate()) == $1) Using similar logic, yours might look like this: eval(obj1.getDateField().before(new Date()) == $1) The construct new Date() should be the current date/time. The eval() statement will return either true or false, so put that in your condition cell. Hope this helps. --Jeff -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of helidesai Sent: Wednesday, February 21, 2007 7:41 AM To: rules-users(a)lists.jboss.org Subject: [rules-users] Problems with Decision Table Hello, I am using JBoss Rules 3.1.0M1. I am using the decision table. I don't know how we can check something like DateField <= currentDate? I have tried to put Today() in data column and in condition I have put DueDt <= $1. But this gives error that 'Unexpected Token' .Is there any way to put current date like new Date() in Dicision table. Also I noticed that the 'Or' condition doesn't work properly. For example if i have to enter the condition like "Policy is Live or Policy is Cancelled" do this 'Msg'. I have to repeat the Action (Msg) field for both the rows with live and cancelled. Is there any other way to implement 'Or'? Another thing is can we use the condition without passing the data field? For example if I put DueDt <= new java.util.Date() in condition table and no fields in data column, will it work? Please let me know. Regards, Heli. -- View this message in context: http://www.nabble.com/Problems-with-Decision-Table-tf3267439.html#a90831 03 Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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Convert logic to DRL rules

by Bill Zhang

Hello, I am a new Drools user trying to convert the following simple logic into DRL: IF (Person.Age > 35 OR Person.Age < 25) AND (Person.ZipCode = 23546 or Person.ZipCode = 68590) THEN Person.Status = "KT"; I found that it is not easy to convert the above logic into ONE DRL rule. I tried something like this when $a: Person(age>35) or Person (age<25) $b: Person(Zipcode==23456) or Person (ZipCode == 68590) $c: $a and $b Then $c.setStatus("KT") But looks like I can not use $c: $a and $b becaue in Drools, you can only bind variable to column, not to other varaibles. Please advise how to do this. I would imagine this should be quite simple, maybe I missed something quite obvious. I know that I can write custom Java method to do this, but if I do that, I suppose I lose the power of RETEOO pattern matching (pattern resuing, etc.). So I prefer not to do that. I also understand I can break the above logic into 4 rules and that would be quite easy, but our business user is not used to think in that way. Also, we have more complex logic than the above. So what I want is to see if there is a way to convert this kind of logic in ONE DRL rule. Thanks in advance. Bill

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RE: [rules-users] "Rules Repository" and "Rule Modeller"

by Anstis, Michael (M.)

Sorry to press; but is a release schedule available? ________________________________ From: Anstis, Michael (M.) Sent: 15 February 2007 09:03 To: 'Rules Users List' Subject: RE: [rules-users] "Rules Repository" and "Rule Modeller" Thanks Michael, Just so that I can acquaintance myself with your release numbering system; 3.0.5 is the current production release and 3.1.0-M1 I assume to be 3.1 Milestone 1 (pre-release). Presumably M2 and M3 are other milestones on the way to production release of 3.1 (you're going to call it 3.2 I think?)?!?! Is there a release schedule available - so we can pile the pressure on when (if) they're late? ;-) Cheers, Mike ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Michael Neale Sent: 14 February 2007 23:59 To: Rules Users List Subject: Re: [rules-users] "Rules Repository" and "Rule Modeller" yeah, very much so. Hopefully have a demo of it in M2 or M3. I have been meaning to update the blog with the latest on package management, but haven't found time, I will do ASAP. On 2/15/07, Anstis, Michael (M.) <manstis1(a)ford.com> wrote: Hi, Just a note to enquire as to the status of the captioned? Have they progressed towards release since http://markproctor.blogspot.com/2007/01/relocation-relocation-repository .html <http://markproctor.blogspot.com/2007/01/relocation-relocation-repositor y.html> ? With kind regards, Michael Anstis ------------------------------------------- COSMO(S) * Trafford House (Int) 8 718 2239 * Trafford House (Ext) +44 (0)1268 702239 * < manstis1(a)ford.com <mailto:manstis1@ford.com> > Ford Motor Company Ltd. Registered in England: No. 235446 Registered Office: Eagle Way BRENTWOOD Essex CM13 3BW _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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Is 3.1 M1 backward compatible?

by Dandrea Francesco

Hi all, the attached example runs ok (slow but ok) on JBoss Rules 3.0.5 Now when I run it with 3.1M1 I have an exception (I pasted it at the end of the mail). Is 3.1 M1 backward compatible? Is this a bug? Should I change the code in some way? Thanks a lot org.drools.RuntimeDroolsException: Exception executing predicate it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker@60bd060e at org.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstr aint.java:196) at org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaC onstraints.java:111) at org.drools.reteoo.NotNode.assertObject(NotNode.java:149) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(Compo siteObjectSinkAdapter.java:313) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:163) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory .java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemo ry.java:724) at org.drools.base.DefaultKnowledgeHelper.assertObject(DefaultKnowledgeHelp er.java:72) at org.drools.base.DefaultKnowledgeHelper.assertObject(DefaultKnowledgeHelp er.java:66) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0.c onsequence(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0.java:17) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Co nsequenceInvoker.evaluate(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0 ConsequenceInvoker.java:22) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:467) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:431) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:360) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:341) at it.telecomitalia.netbox.MainProvaClass.fireRuleEngineProva(MainProvaClas s.java:85) at it.telecomitalia.netbox.MainProvaClass.main(MainProvaClass.java:23) Caused by: java.lang.ClassCastException: it.telecomitalia.netbox.AggregatedAlarmShadowProxy at org.drools.base.it.telecomitalia.netbox.AllarmeTf$getReferencedElement.g etValue(Unknown Source) at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:79 ) at org.drools.rule.Declaration.getValue(Declaration.java:156) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker.evaluate(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0P redicate0Invoker.java:14) at org.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstr aint.java:190) ... 18 more org.drools.RuntimeDroolsException: Exception executing predicate it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker@60bd060e at org.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstr aint.java:196) at org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaC onstraints.java:111) at org.drools.reteoo.NotNode.assertObject(NotNode.java:149) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(Compo siteObjectSinkAdapter.java:313) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:163) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory .java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemo ry.java:724) at org.drools.base.DefaultKnowledgeHelper.assertObject(DefaultKnowledgeHelp er.java:72) at org.drools.base.DefaultKnowledgeHelper.assertObject(DefaultKnowledgeHelp er.java:66) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0.c onsequence(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0.java:17) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Co nsequenceInvoker.evaluate(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0 ConsequenceInvoker.java:22) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:467) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:431) at org.drools.common.AbstractWorkingMemory.doOtherwise(AbstractWorkingMemor y.java:384) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:366) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:341) at it.telecomitalia.netbox.MainProvaClass.fireRuleEngineProva(MainProvaClas s.java:85) at it.telecomitalia.netbox.MainProvaClass.main(MainProvaClass.java:23) Caused by: java.lang.ClassCastException: it.telecomitalia.netbox.AggregatedAlarmShadowProxy at org.drools.base.it.telecomitalia.netbox.AllarmeTf$getReferencedElement.g etValue(Unknown Source) at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:79 ) at org.drools.rule.Declaration.getValue(Declaration.java:156) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker.evaluate(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0P redicate0Invoker.java:14) at org.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstr aint.java:190) ... 19 more org.drools.spi.ConsequenceException: org.drools.RuntimeDroolsException: Exception executing predicate it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker@60bd060e at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:471) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:431) at org.drools.common.AbstractWorkingMemory.doOtherwise(AbstractWorkingMemor y.java:384) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:366) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:341) at it.telecomitalia.netbox.MainProvaClass.fireRuleEngineProva(MainProvaClas s.java:85) at it.telecomitalia.netbox.MainProvaClass.main(MainProvaClass.java:23) Caused by: org.drools.RuntimeDroolsException: Exception executing predicate it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker@60bd060e at org.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstr aint.java:196) at org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaC onstraints.java:111) at org.drools.reteoo.NotNode.assertObject(NotNode.java:149) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(Compo siteObjectSinkAdapter.java:313) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:163) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory .java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemo ry.java:724) at org.drools.base.DefaultKnowledgeHelper.assertObject(DefaultKnowledgeHelp er.java:72) at org.drools.base.DefaultKnowledgeHelper.assertObject(DefaultKnowledgeHelp er.java:66) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0.c onsequence(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0.java:17) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Co nsequenceInvoker.evaluate(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0 ConsequenceInvoker.java:22) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:467) ... 6 more Caused by: java.lang.ClassCastException: it.telecomitalia.netbox.AggregatedAlarmShadowProxy at org.drools.base.it.telecomitalia.netbox.AllarmeTf$getReferencedElement.g etValue(Unknown Source) at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:79 ) at org.drools.rule.Declaration.getValue(Declaration.java:156) at it.telecomitalia.netbox.Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0Pr edicate0Invoker.evaluate(Rule_Nuovo_Allarme_Misura_No_Allarme_Oggetto_0P redicate0Invoker.java:14) at org.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstr aint.java:190) ... 19 more -------------------------------------------------------------------- CONFIDENTIALITY NOTICE This message and its attachments are addressed solely to the persons above and may contain confidential information. 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accumulate / collect behaviour question - another stupid question

by Olenin, Vladimir (MOH)

Hi, Edson quoted the following sample rule some time ago: rule "transaction consistency" when Transaction( $id : id ) $credits: Double( ) from accumulate( TransactionEntry( id == $id, operation == "credit", $amount : amount ), init( double balance = 0 ), action( balance += $amount ), result( new Double( balance ) ) ); $debits: Double( ) from accumulate( TransactionEntry( id == $id, operation == "debit", $amount : amount ), init( double balance = 0 ), action( balance -= $amount ), result( new Double( balance ) ) ); eval( ! $credits.equals( $debits ) ) then // inconsistency for transaction $id End If there are 100 transactions overall and only 10 unique transaction ids (eg, id = 1..10), so that we have on average 10 Transaction facts per id, - how many times will 'eval' be called? - how many times will the action be called, assuming 'eval' always returns 'true'? I guess the answer for the above should be '10 times', once per each id? What if I put another eval statement like "eval($id == 1)" after existing 'eval'? Would that be evaluated 100 times (for all Transaction facts) or only 10 times (once per unique id)? I think I'm missing quite significant piece on how tuples are selected in DROOLS and how 'eval' and new 'from accumulate' features work.... Any pointers would be greatly appreciated! (would some general literature on rule engines help to clear up this types of questions?...) Thanks, Vlad PS: sorry for posting so many questions and answering so few.....

17 years, 9 months

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"not" combined with predicate?

by Chris West

Does anyone know if there is a problem using a "not" combined with a predicate expression? Drools gives me a NullPointerException sometimes when evaluating my predicate. The example from the user guide is: Person( girlAge : age, sex = "F" ) Person( boyAge : age -> ( girlAge.intValue() == boyAge.intValue() + 2 ), sex = 'M' ) Buy I'm trying something similar to: Person( girlAge : age, sex = "F" ) not Person( boyAge : age -> ( girlAge.intValue() == boyAge.intValue() + 2 ), sex = 'M' ) And also: Person( girlAge : age, sex = "F" ) not Person( boyAge : age, sex = 'M' ) eval ( girlAge.intValue() == boyAge.intValue() + 2 ) Is there anything wrong with these? The compiler does not have a problem with the former, but does not like the latter. I'm using Drools 3.0.5. I'm basically trying to say "there is a girl, and there is not a boy whose age is 2 years less than the girl". Any thoughts on this would be greatly appreciated. Thanks, -Chris West

17 years, 9 months

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Another upgrade to 3.0.5 question

by Ronald R. DiFrango

All, OK, in my current 2.1 version of my app, I have 8 different rules files that have different sets of rules. In looking at 3.0.5 [and maybe this existed previously, but I missed it], there is a method on PackageBuilder called addPackageFromDrl. Can I load all the individual sets into 1 rule package? Then Drools will determine which rules to fire based upon what objects are asserted into working memory? The reason I came to this is I was looking at the Spring integration and was wondering if I should have 1 RuleBased of the 8 individual ones like I have today. Thoughts and Suggestion Welcome! Ron

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RE: [rules-users] logical 'not' - is there such a construct?

by Olenin, Vladimir (MOH)

In effect, is such construct is allowed now in 3.1M? not ( exists MyObject2(field == 'value') ) I'm just not sure what 'not' element as an 'existential operation' will do in case it's passed 'boolean' result as an operand. Would it act as a logical negation? I understand that the above construct can be simply expressed by removing 'exists' altogether, but the problem is that the above is the result of 'automatic template' generation (ie, there is a sequence of columns with 'exists' and 'not' elements and in case there is only one such element the generation might result in the above construct). Thanks, Vlad -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 20 February 2007 16:30 To: Rules Users List Subject: Re: [rules-users] logical 'not' - is there such a construct? No, the "not" conditional element is an existential operator, so the meaning is what you expressed in your first example. I thought that was what you were looking for, but apparently it is not. I never heard about any construction capable of doing what you are asking for in a rules engine... maybe someone else can throw some light in... []s Edson Olenin, Vladimir (MOH) wrote: >So, if used like that, 'not' does not have 'existential' meaning then, but >simple 'negation'? I mean, the expression > > not MyObject(field == 'value') > >would still mean 'not exists', correct? Would the expression > > not (MyObject(field == 'value')) > >mean > > MyObject(field != 'value') > >then. In other worlds, "all objects OTHER then those matching the >constraint"? > >Thanks. > >Vlad > >-----Original Message----- >From: rules-users-bounces(a)lists.jboss.org >[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli >Sent: 20 February 2007 14:37 >To: Rules Users List >Subject: Re: [rules-users] logical 'not' - is there such a construct? > > Vlad, > >In 3.1M1 you can write: > >rule X >when >not ( >MyObject( aaa == "bbb" ) and >MyObject2( bbb == "aaa" ) >) >then >// do something >end > >But remember that variables bound inside the "not" block are not avaible >in the consequence for obvious reasons. > >[]s >Edson > >Olenin, Vladimir (MOH) wrote: > > > >>Hi, >> >>I wonder if there is logical 'not' operator (in the meaning of "!=" -> >>'not equal') which can be applied to the whole rule? Eg: >> >>Rule x >> >>When >> >>! ( >> >>MyObject(aaa == "bbb") >> >>MyObject2(bbb == "aaa") >> >>) >> >>Then >> >>// do smth >> >>End >> >>Basically I'm looking for an operator to reverse the evaluation result >>of the expression in the brackets. The use case: in my system all >>rules are defined from 'rule passes' prospective, while the >>application should take some action in case the rule is NOT passed >>(ie, 'else' case). >> >>Any way to do that except reformulating the constraints themselves? >> >>Thanks, >> >>Vlad >> >>------------------------------------------------------------------------ >> >>_______________________________________________ >>rules-users mailing list >>rules-users(a)lists.jboss.org >>https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> > > > > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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rules-users February 2007