February 2007 - rules-users - Jboss List Archives

RE: [rules-users] Parse bug in predicate constraints?

by Olenin, Vladimir (MOH)

Also, since everything in rules needs to be an Object, is there any plan to make the operators deal with said Objects? That is, so I do not always have to de-reference with my eval or predicate objects with intValue() or floatValue() or whatever? Not a DROOLS expert, but from what I understand this is already possible now as long as you are using Java 1.5 (which has autoboxing/autounboxing as part of the language spec). Vlad _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Justine Hlista Sent: 08 February 2007 15:12 To: rules-users(a)lists.jboss.org Subject: [rules-users] Parse bug in predicate constraints? Should predicate constraints be sensitive to whitespace?? I have the following rule with a predicate constraint: rule "test" when valObj : MyValuesObject(a:aVal, b:bVal, c:cVal -> ((a.intValue() < (1/780) * (b.intValue() + c.intValue()) && (b.intValue() + c.intValue()) > 500000) then System.out.println("Alert condition met on obj:" + valObj); end Inserting whitespace into the predicate results in the following exception: org.drools.rule.InvalidRulePackage: unknown:155:85 mismatched token: [@1723,5226:5227='\r\n',<4>,155:85]; expecting type ')' unknown:156:28 mismatched token: [@1752,5256:5256='(',<23>,156:28]; expecting type ')' If instead I use an eval on the LHS, I can insert whitespace without an exception. In addition, I would like to know if there are any plans to simplify the syntax for similar types of rules, as the above is extremely unwieldy for the non-expert. For instance, I would vastly prefer to write the following: rule "test" when valObj : MyValuesObject(a:aVal, b:bVal, c:cVal) (a < (1/780)*(b+c)) ((b + c) > 500000) then System.out.println("Alert condition met on obj:" + valObj); end Also, since everything in rules needs to be an Object, is there any plan to make the operators deal with said Objects? That is, so I do not always have to de-reference with my eval or predicate objects with intValue() or floatValue() or whatever? In our application, the user (i.e. not a drools or java expert) will be writing the rules. The current syntax requirements for encoding the above simple rule makes me very nervous about our users ever being able to use the rules effectively. Thanks, Justine

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Parse bug in predicate constraints?

by Justine Hlista

Should predicate constraints be sensitive to whitespace?? I have the following rule with a predicate constraint: rule "test" when valObj : MyValuesObject(a:aVal, b:bVal, c:cVal -> ((a.intValue() < (1/780) * (b.intValue() + c.intValue()) && (b.intValue() + c.intValue()) > 500000) then System.out.println("Alert condition met on obj:" + valObj); end Inserting whitespace into the predicate results in the following exception: org.drools.rule.InvalidRulePackage: unknown:155:85 mismatched token: [@1723,5226:5227='\r\n',<4>,155:85]; expecting type ')' unknown:156:28 mismatched token: [@1752,5256:5256='(',<23>,156:28]; expecting type ')' If instead I use an eval on the LHS, I can insert whitespace without an exception. In addition, I would like to know if there are any plans to simplify the syntax for similar types of rules, as the above is extremely unwieldy for the non-expert. For instance, I would vastly prefer to write the following: rule "test" when valObj : MyValuesObject(a:aVal, b:bVal, c:cVal) (a < (1/780)*(b+c)) ((b + c) > 500000) then System.out.println("Alert condition met on obj:" + valObj); end Also, since everything in rules needs to be an Object, is there any plan to make the operators deal with said Objects? That is, so I do not always have to de-reference with my eval or predicate objects with intValue() or floatValue() or whatever? In our application, the user (i.e. not a drools or java expert) will be writing the rules. The current syntax requirements for encoding the above simple rule makes me very nervous about our users ever being able to use the rules effectively. Thanks, Justine

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3.2M1 - is it available?

by Olenin, Vladimir (MOH)

Hi, I think I've seen a message some time ago on the list mentioning that the first milestone 3.2 release has been tagged in the CVS. Is it true? If so, would this release be available somewhere on the site as a library download (together with the documentation, at least for the new functionality). I've just checked one benchmark (http://www.kbsc.com/Performance2006.xls <http://www.kbsc.com/Performance2006.xls> ) and it seems like 3.2 version is ~ 3 times faster than 3.0... Very impressive, considering a bulk of new functionality has been added as well..... Thanks. Vlad

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java.lang.NoSuchMethodError

by Francisco Brum

Hello everybody! I'm having the same problem that you had, but when I run the project from the JBoss Server and try do run the code with the JBoss rules, I get the error: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/eclipse/jdt/core/compiler/CategorizedProblem; at org.apache.commons.jci.compilers.EclipseJavaCompiler$2.acceptResult(EclipseJavaCompiler.java:237) at org.eclipse.jdt.internal.compiler.Compiler.handleInternalException(Compiler.java:415) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:352) at org.apache.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:268) at org.drools.compiler.PackageBuilder.compileAll(Unknown Source) at org.drools.compiler.PackageBuilder.addPackage(Unknown Source) at org.drools.compiler.PackageBuilder.addPackageFromDrl(Unknown Source) I've downloaded the ecj.jar, which haves the org\eclipse\jdt\internal\compiler\CompilationResult.class with the getProblems() method, to the \lib folder of the server! But it seems that this ecj.jar haves some conflict, because there are times that it works and others it doesn't. So I have tried do look for the org.eclipse.jdt.core_3.2.0.v_642.jar In my org.drools.ide_3.0.5, but didn't found it. Don't know where to!! What should I do? Thanks in advanced for your attention FBrum. History of a similar problem solved in this mailing list: shilpa.raghavendra Sun, 28 Jan 2007 23:38:14 -0800 Thank you very much Steve its working fine. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL <mailto:%5BEMAIL> PROTECTED] On Behalf Of Steven Williams Sent: Monday, January 29, 2007 10:20 AM To: Rules Users List Subject: Re: [rules-users] java.lang.NoSuchMethodError Sorry Shilpa - I was looking at 3.0.5. What I said still holds true though - make sure the v642 jar is at the top of your runtime classpath. On 1/29/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: I am using org.drools.ide_3.0.4 as eclipse plug-in it's having org.eclipse.jdt.core_3.2.0.v_642.jar Still I have to use higher version Regards Shilpa __________________________________ Francisco Brum - francisco.brum(a)link.pt <mailto:rui.arrenega@link.pt> Link Consulting - http://www.link.pt/ <http://www.link.pt/> Tel.: 213 100 031 Av. Duque D'Ávila, 23 4º Esq. 1000-138 Lisboa

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Re: rules-users Digest, Vol 3, Issue 17

by Mahantesh

Thanks sumedha. But the thing is that i was having very period to do this. So i have not gone into full detail. I want to know one more thing is what is the difference between using DRL rule and XML rule? which is best in all ways? On 2/8/07, rules-users-request(a)lists.jboss.org < rules-users-request(a)lists.jboss.org> wrote: > > Send rules-users mailing list submissions to > rules-users(a)lists.jboss.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.jboss.org/mailman/listinfo/rules-users > or, via email, send a message with subject or body 'help' to > rules-users-request(a)lists.jboss.org > > You can reach the person managing the list at > rules-users-owner(a)lists.jboss.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of rules-users digest..." > > > Today's Topics: > > 1. retracting a fact after all interested rules have fired?? > (Justine Hlista) > 2. Re: Adding DROOLS/JBoss Rules to classpath (Kris Verlaenen) > 3. Rule engine query. (Mahantesh) > 4. Rule engine query. (Mahantesh) > 5. Re: Rule engine query. (sumedha rubasinghe) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 7 Feb 2007 18:00:25 -0600 > From: "Justine Hlista" <justine(a)vsasset.com> > Subject: [rules-users] retracting a fact after all interested rules > have fired?? > To: rules-users(a)lists.jboss.org > Message-ID: <cc2c89a0702071600k8a3196fo200b693fcbe483(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Need some instruction for retraction strategies. We have an application > that > receives messages about the status of various things in the system, and at > the moment I am asserting these messages as facts. The rules are written > against these messages. Various rules might be interested in various > values > in the message, and they all fire independently. The problem is that after > all the existing rules that are interested in the message have fired, I > want > to retract the message. How do I ensure that all the interested rules have > fired first?? > > At the moment, I am trying to use a salience value of -1 to make sure a > simple "cleanup" rule fires last: > > rule "cleanupMessage" > no-loop true > salience -1 > when > msg : MyMessage() > then > retract(msg) > end > > Does this sound like a reasonable solution? Is there a better one?? > > Thanks! > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.jboss.org/pipermail/rules-users/attachments/20070207/215f8d9... > > ------------------------------ > > Message: 2 > Date: Thu, 8 Feb 2007 02:33:05 +0100 > From: "Kris Verlaenen" <kris.verlaenen(a)cs.kuleuven.be> > Subject: Re: [rules-users] Adding DROOLS/JBoss Rules to classpath > To: "Rules Users List" <rules-users(a)lists.jboss.org> > Message-ID: <001c01c74b21$14fe42c0$a9925b0a@BORG2> > Content-Type: text/plain; charset="windows-1252" > > Yes, the drools jars do not contain any source by default (to limit the > size of the jars). > There are two ways to use the source of these classes though: > * When you are trying to debug an application in eclipse, and you open the > debug dialog (right click your Java main class, select Debug As -> Debug > ...), there is a tab there you can use to add sources. If you download the > sources from svn and import these as Java projects in eclipse, you can just > add those projects to the source lookup path. I added a screenshot to help > you out with that. > * If you add the sources to the drools jars directly (in the same dir as > the corresponding class files, so not in a separate src dir or something > like that), those sources will be found automatically as well. So > rebuilding those jars and adding the sources should do the trick for all > your projects at once. > > Kris > > ----- Original Message ----- > From: Steven Williams > To: Rules Users List > Sent: Wednesday, February 07, 2007 1:53 AM > Subject: Re: [rules-users] Adding DROOLS/JBoss Rules to classpath > > > In addition to that Kris I have noticed that I can't attach source to > any of the drools jars in eclipse - it seems to treat these jars > differently. Do you know how we can attach the source? > > thanks > Steve > > > On 2/7/07, Kris Verlaenen <kris.verlaenen(a)cs.kuleuven.be> wrote: > Currently, a JBoss Rules project is just a Java project with two > additional characteristics: > * The JBoss Rules classpath container is added to the classpath of > the project > * A JBoss Rules builder automatically checks all rules for possible > errors > > In the current version of the IDE (3.0.5) you can only convert > existing projects to JBoss rules projects by manually altering the .project > and .classpath files as described in the documentation. The latest version > in trunk already contains a shortcut where you can right-click the .project > file and select the "Convert to JBoss Rules Project" action. I will see > whether it is possible to add the JBoss Rules classpath container to the > list of libraries that can be added. > > Kris > > ----- Original Message ----- > From: Grimshaw, Jeffrey > To: Rules Users List > Sent: Monday, February 05, 2007 7:23 PM > Subject: [rules-users] Adding DROOLS/JBoss Rules to classpath > > > Hi all. I'm having some trouble adding the JBoss Rules custom > classpath container to an existing project in Eclipse. I can do it by > adding the following line to the project's .classpath file: > > <classpathentry kind="con" path="DROOLS/JBoss Rules"/> > > Is there another/better way to do this? I would expect to be able > to do it somewhere in Build Path --> Add Libraries…, but I have had no luck. > > Thanks, > > -- Jeff Grimshaw > > > > > > -------------------------------------------------------------------------- > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm for more > information. > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > > -- > Steven Williams > > Supervising Consultant > > Object Consulting > Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 > stevenw(a)objectconsulting.com.au > www.objectconsulting.com.au > > consulting | development | training | support > our experience makes the difference > > > > ------------------------------------------------------------------------------ > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.jboss.org/pipermail/rules-users/attachments/20070208/0054f20... > > ------------------------------ > > Message: 3 > Date: Thu, 8 Feb 2007 12:03:18 +0530 > From: Mahantesh <mahanteshsg(a)gmail.com> > Subject: [rules-users] Rule engine query. > To: rules-users(a)lists.jboss.org > Message-ID: > <ee7c194c0702072233t2e1f1d88q1d5aca2967dd242d(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, > > I am using JBoss Rule Engine Drools 3.0 from last 2 months. As i know the > rule engine is used in an application where the data or policies will be > changing on and on. But i am using in an project which has something > different. > > I am using it for filtering the data. I am having a server where there are > lot of processes will be running and each process is having so many > attributes. So as i said i am using it for filtering the data based > different/combination of attributes. > But i am not able to understand whether i can use rule engine for this > purpose? because samething i can do by executing the SQL query instead of > using Rule Engine. > > Whether it makes any sense or it is unneccessary performance bottleneck? > if > i use what all the merits and demerits? > > Thanks in advance, > Mahantesh. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.jboss.org/pipermail/rules-users/attachments/20070208/507f419... > > ------------------------------ > > Message: 4 > Date: Thu, 8 Feb 2007 14:29:31 +0530 > From: Mahantesh <mahanteshsg(a)gmail.com> > Subject: [rules-users] Rule engine query. > To: rules-users(a)lists.jboss.org > Message-ID: > <ee7c194c0702080059q27c59e0cvc1c0fae7020f8c65(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, > > I am using JBoss Rule Engine Drools 3.0 from last 2 months. As i know the > rule engine is used in an application where the data or policies will be > changing on and on. But i am using in an project which has something > different. > > I am using it for filtering the data. I am having a server where there are > lot of processes will be running and each process is having so many > attributes. So as i said i am using it for filtering the data based > different/combination of attributes. > But i am not able to understand whether i can use rule engine for this > purpose? because samething i can do by executing the SQL query instead of > using Rule Engine. > > Whether it makes any sense or it is unneccessary performance bottleneck? > if > i use what all the merits and demerits? > > Thanks in advance, > Mahantesh. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.jboss.org/pipermail/rules-users/attachments/20070208/c320a71... > > ------------------------------ > > Message: 5 > Date: Thu, 8 Feb 2007 16:16:00 +0530 > From: "sumedha rubasinghe" <sumedha.r(a)gmail.com> > Subject: Re: [rules-users] Rule engine query. > To: "Rules Users List" <rules-users(a)lists.jboss.org> > Message-ID: > <358531180702080246v654ecb29g369d14519bb275e5(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi Mahantesh, > Using the Rule Engine is also a possibility. But you have to consider the > merits & de-merits yourself considering the performance requirements of > your > application. > Why don't you use AOP for this? > > /sumedha > > > On 2/8/07, Mahantesh <mahanteshsg(a)gmail.com> wrote: > > > > Hi, > > > > I am using JBoss Rule Engine Drools 3.0 from last 2 months. As i know > the > > rule engine is used in an application where the data or policies will be > > changing on and on. But i am using in an project which has something > > different. > > > > I am using it for filtering the data. I am having a server where there > are > > lot of processes will be running and each process is having so many > > attributes. So as i said i am using it for filtering the data based > > different/combination of attributes. > > But i am not able to understand whether i can use rule engine for this > > purpose? because samething i can do by executing the SQL query instead > of > > using Rule Engine. > > > > Whether it makes any sense or it is unneccessary performance bottleneck? > > if i use what all the merits and demerits? > > > > Thanks in advance, > > Mahantesh. > > > > > > > > _______________________________________________ > > rules-users mailing list > > rules-users(a)lists.jboss.org > > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.jboss.org/pipermail/rules-users/attachments/20070208/33198be... > > ------------------------------ > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > End of rules-users Digest, Vol 3, Issue 17 > ****************************************** >

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Rule engine query.

by Mahantesh

Hi, I am using JBoss Rule Engine Drools 3.0 from last 2 months. As i know the rule engine is used in an application where the data or policies will be changing on and on. But i am using in an project which has something different. I am using it for filtering the data. I am having a server where there are lot of processes will be running and each process is having so many attributes. So as i said i am using it for filtering the data based different/combination of attributes. But i am not able to understand whether i can use rule engine for this purpose? because samething i can do by executing the SQL query instead of using Rule Engine. Whether it makes any sense or it is unneccessary performance bottleneck? if i use what all the merits and demerits? Thanks in advance, Mahantesh.

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Rule engine query.

by Mahantesh

Hi, I am using JBoss Rule Engine Drools 3.0 from last 2 months. As i know the rule engine is used in an application where the data or policies will be changing on and on. But i am using in an project which has something different. I am using it for filtering the data. I am having a server where there are lot of processes will be running and each process is having so many attributes. So as i said i am using it for filtering the data based different/combination of attributes. But i am not able to understand whether i can use rule engine for this purpose? because samething i can do by executing the SQL query instead of using Rule Engine. Whether it makes any sense or it is unneccessary performance bottleneck? if i use what all the merits and demerits? Thanks in advance, Mahantesh.

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Adding DROOLS/JBoss Rules to classpath

by Grimshaw, Jeffrey

Hi all. I'm having some trouble adding the JBoss Rules custom classpath container to an existing project in Eclipse. I can do it by adding the following line to the project's .classpath file: <classpathentry kind="con" path="DROOLS/JBoss Rules"/> Is there another/better way to do this? I would expect to be able to do it somewhere in Build Path --> Add Libraries..., but I have had no luck. Thanks, -- Jeff Grimshaw

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RE: [rules-users] [Column(f1=='v1', f2=='v2')] vs [Column(f1= ='v1') Column(f2== 'v2')]

by Olenin, Vladimir (MOH)

Hi, Edson. Thanks for the explanation. Just wanted to clarify one thing. If I have a set of following Column fact objects and I put then into workspace using the 'identity' mode (below are only field values the facts are initialized with, one per line, each line is a separate Column fact): 1) f1='v1', f2='v1' 2) f1='v1', f2='v11' 3) f1='v1', f2='v2' 4) f1='v2', f2='v2' 5) f1='v11', f2='v2' 6) f1='v11', f2='v22 then the condition Column(f1=='v1') Column(f2=='v2') will select facts exactly 5 facts: 1, 2, 3, 4, 5, but NOT 6, correct? Won't the condition above then be the same as: Column(f1=='v1') or Column(f2=='v2') ? Thanks. Vlad PS: any feedback/hints on some other questions I've sent earlier today would be very much appreciated as well! -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 07 February 2007 13:15 To: Rules Users List Subject: Re: [rules-users] [Column(f1=='v1', f2=='v2')] vs [Column(f1=='v1') Column(f2== 'v2')] Vlad, The constructions are semantically different. In 3.0.x as default, JBoss Rules will not allow the same fact to match more than one column. So if you write: Column(f1=='v1') Column(f2=='v2') Your rule will only match if there are 2 different objects that each match one of the constraints. While, if you write: Column(f1=='v1', f2=='v2') It will require a single object that matches both constraints. Also, the optimizations (indexing, hashing, etc) are done on a field constraint basis. So, if you have one rule with : Column(f1=='v1', f2=='ONE_VAL') And another rule with: Column(f1=='v1', f2=='ANOTHER_VAL') The constraint f1=='v1' will be evaluated only once. Although, to help optimization, you must keep the constraints that repeat over multiple patterns as the first constraints for each collumn, in the same order. []s Edson Olenin, Vladimir (MOH) wrote: >Hi, > > > >I wonder what is the difference (performance-wise, etc) between these two >constructs: > > > >Column(f1=='v1', f2=='v2') > > > >And > > > >Column(f1=='v1') > >Column(f2=='v2') > > > >? > > > >Both of them should select the same 'Column' facts (where Column.f1=='v1' && >Column.f2='v2'), correct? Is one construct more preferable then another one? >Does JBossRules hash only the evaluation result of the 'full column' OR >individual field constraints as well? From what I understand, only the full >'Column' is defined as an (alpha?) node while individual constraints within >the node can not be further optimized, correct? > > > >Meaning, if I have another condition somewhere like this: > > > > Column(f1=='v1', f2=='ANOTHER_VAL') > > > >[f1=='v1'] constraint would have to be reevaluated again, while if I define >constraints through two 'separate' columns and the new constraint as > > > > Column(f1=='v1) > > Column(f2=='ANOTHER_VAL') > > > >only the new constraint would have to be reevaluated. Do I understand it >right? > > > >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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rule chaining problem?

by Gerardo

Hi everyone, I have this scenario: A diagram with nodes and arcs between them. I'm willing to control the visual elements with rules. Nodes are asserted at the moment of insertion. Object node = new AnyObject() ; FactHandle hNode = workingMemory.assertObject( node ) ; Nodes are retracted from working memory when are deleted from the diagram. workingMemory.retractObject( hNode ) ; Arcs can not exist in the diagram if any of the related nodes no longer exists. So I must have a rule that keeps consistency in the diagram, something like: ## to illustrate the problem just checking source rule "Delete no longer valid arcs" when a : Arc(s: source, tag, t: target) not s: Object() then retract(a) ; end But the rule is not working, help is much appreciated Regards, Gerardo Segura

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rules-users February 2007