February 2007 - rules-users - Jboss List Archives

Money Shot

by Mark Proctor

Enjoy :) http://markproctor.blogspot.com/2007/02/jboss-rules-debug-money-shot.html The JBoss Rules Team

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Use of helper class to simulate "accumulate"

by Jeevan Tambuluri

Hello all, I have been told that you could implement a helper class to simulate "accumulate" command in drools. Could you please ealborate on how to do this? Some code snippet to illustrate this would be very much appreciated. My problem is as follows.I have two types of facts - Tree and Branch. Each Branch object has a reference to the Tree object it belongs to. I want to write a rule: The number of branches in a tree must not exceed 100. I guess this would be easy to write with "accumulate" command, which is not yet available in 3.0.x. Thanks Jeevan

19 years, 1 month

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[Column(f1=='v1', f2=='v2')] vs [Column(f1=='v1') Column(f2== 'v2')]

by Olenin, Vladimir (MOH)

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

19 years, 1 month

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Problem binding to property "attributes"

by Anstis, Michael (M.)

Hi, I have a simple class:- public class Simple { private Attributes attributes; public Attributes getAttributes() { return this.attributes; } } And a simple rule:- rule "Simple" when $s : Simple( $a : attributes ) then System.out.println("Simple!"); End I receive an "Unexpected token $a" error in the Eclipse plug-in. Thinking it might just be related to the plug-in I naively run the code and receive a org.drools.rule.InvalidRulePackage error. If I change the property name to something else like this:- public class Simple { private Attributes attributes; public Attributes getSmurf() { return this.attributes; } } rule "Simple" when $s : Simple( $a : smurf ) then System.out.println("Simple!"); End Everything is fine. Is this a known issue? With kind regards, Michael Anstis ------------------------------------------- Next Generation Estimating System * Trafford House (Int) 8 718 2239 * Trafford House (Ext) +44 (0)1268 702239 * <manstis1(a)ford.com> Ford Motor Company Ltd. Registered in England: No. 235446 Registered Office: Eagle Way BRENTWOOD Essex CM13 3BW

19 years, 1 month

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Using variable in a drl file

by Yen Chiu

Hi everyone, Can anyone guide me on how to declare a variable (e.g: a double variable) and use it throughout the drl file from top to bottom. almost similar to the function like semaphore. Thanks. Regards, Yen This correspondence is for the named persons only. It may contain confidential or privileged information or both. No confidentiality or privilege is waived or lost by any mis transmission. If you receive this correspondence in error please delete it from your system immediately and notify the sender. You must not disclose, copy or relay on any part of this correspondence, if you are not the intended recipient. Any opinions expressed in this message are those of the individual sender except where the sender expressly, and with the authority, states them to be the opinions of the Department of Emergency Services, Queensland.

19 years, 1 month

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decision table - access to params $1, $2, ... as an 'array' + esc aping ',' in field values?

by Olenin, Vladimir (MOH)

Hi, I wonder if it's possible to access parameters in the decision table template as an array? In other words, instead of addressing individual parameters through numbered notation (field1 > $1, field2 > $2) is it possible to do something like this ( HelperClass.checkAllMyFields($parameters) ), where 'checkAllMyFields' method accepts an array of objects/strings? Another slightly related question is whether it is possible to use 'comma' as a character in the field value? In other words, if I have a string "abcd,efg" and I want it to be interpreted as a single parameter, how do I escape ',' character? Thanks. Vlad

19 years, 1 month

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Creating a long literal

by Aziz Boxwala

Is there a way to create a long literal in a rule condition? Typing 30L results in a syntax error because of the L at the end. The error occurs even if I put this literal in eval. --Aziz

19 years, 1 month

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deffact equivalent

by Gerardo

Hello everybody, is there an equivalent to jess' deffact to specify initial facts? I mean no programmatically but in the .drl file or some other file regards

19 years, 1 month

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predicate vs return value expression - what's the difference?

by Olenin, Vladimir (MOH)

Hi, I'm reading through DROOLS manual and can't understand the difference / explanations regarding predicate expression (Figure 3.17) and return value expression (Figure 3.18). The manual gives two examples of the same thing done two different ways: Predicate expression: Person( girlAge : age, sex = "F" ) Person( boyAge : age -> ( girlAge.intValue() == boyAge.intValue() + 2 ), sex = 'M' ) Return value expression: Person( girlAge : age, sex == "F" ) Person( age == ( new Integer(girlAge.intValue() + 2) ), sex == 'M' ) While the 'return value' expression is more or less clear, I can't understand the semantics of 'predicate' ('->') operator. Can anyone decode this? What's the difference between the two? When each of the ways should be used and why? Thanks! Vlad

19 years, 1 month

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RE: [rules-users] BRMS: Evaluation: JBoss Rules 3.2?

by Anstis, Michael (M.)

Are there any (port 80) mirrors from where I can download M1? The subversion repository at http://labs.jboss.com (http://65.244.175.212:8080/portal/jbossrules/subversion.html) is inaccessible through our company firewalls (well, I get HTTP500 in reply). Cheers, Mike ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: 05 February 2007 12:43 To: Rules Users List Subject: Re: [rules-users] BRMS: Evaluation: JBoss Rules 3.2? Sorry you Q was about ruleflow in general, not just general releases. Yes RuleFlow is in there and Kris has already done some basic tooling. We are currently trying to decide whether we have the ruleflow as xml or something like drl. As you do ruleflows with tooling we are tempted to keep it xml. Mark Anstis, Michael (M.) wrote: Hi, Is there any update as to the availability of ruleflow in 3.2 as it's become pivotal to our use of JBoss Rules? Thanks, Mike ________________________________ From: Mark Proctor [mailto:mproctor@codehaus.org] Sent: 23 January 2007 16:50 To: Anstis, Michael (M.) Subject: Re: [rules-users] BRMS: Evaluation: JBoss Rules 3.2? as soon as MVEL is ready we'll do an M1, but the ruleflow part is not exposed to thte drl language yet, that will take a few more weeks. Mark Anstis, Michael (M.) wrote: I might have a play around just to see how I get on, but think I'll wait for 3.1 before I get "serious" - can I get the latest (unstable) code (is it CVS or somewhere)? - and I won't be using this private address ongoing (I didn't want to hit the rules list with news of your latest code). ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: 23 January 2007 16:13 To: Rules Users List Subject: Re: [rules-users] BRMS: Evaluation: JBoss Rules 3.2? not sure its that simple as the stack concept is built into the engine. but good luck. Mark Anstis, Michael (M.) wrote: Thanks Mark, I think I've got the hang of AgendaGroups!! Presumably if I sub-class DefaultAgenda and override setFocus(AgendaGroup ag) and getNextfocus() I can implement my own flow-like mechanism instead of the standard stack. I'd need to add a way in which to override the DefaultAgenda created in ReteooWorkingMemory's constructor too but this again should be a simple sub-class (together with a subclass of ReteooRulebase with override of newWorkingMemory and a new RuleBaseFactory to allow me to construct these new objects). Anything major I've missed - my experience with rules engines now totals a couple of weeks and it's possible I'm missing the point!! With kind regards, Mike ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: 22 January 2007 16:33 To: Rules Users List Subject: Re: [rules-users] BRMS: Evaluation: JBoss Rules 3.2? Anstis, We don't have ruleflow, but we do have AgendaGroups which can provide a form of rule flow, just that its actually stack based. I'm working on a more general ruleflow idea at the moment, it may make it into the end of Q1 release, but its not defnite yet. Normally you cache the rulebase in a singleton and then just creating working memory instances as and when you need to - creating a working memory is light. The guided gui builder is for 3.2, it's web only based on GWT, I believe that it will also do DSLs (Mic will have to confirm that). Mark Anstis, Michael (M.) wrote: Hi, I'm evaluating BRMS's for a new project at work. JBoss Rules today swung into pole position however I am unclear on a number of features. I wonder whether this user-group can help? I list a number of aspects I "think" are currently missing in JBoss Rules together with my thoughts: If anybody can clarify the position, provide alternatives or help push JBoss Rules I'd be pleased to hear! * We require ruleflow (where rules run sequentially; like "identify all machines X" then "calculate prices" - not perhaps a good illustration as this could be written as one rule "calculate all prices using machine XXX"!!!). Ideally "dynamic" ruleflow is required too - where the next rule in a sequence is determined by the outcome of a preceding rule (I have seen dynamic achieved with "trigger" Facts asserted as the RHS of rules however our "Business Users" cannot be expected to author rules following this design pattern. I have also seen static implemented with salience). Is ruleflow (static or dynamic) part of 3.2 - otherwise we'll need to categorise rules having different types fired throughout a "coded" process in Java. * A J2EE runtime to provide scalability of the RETE engine. We need to have the engine being shared across sessions on a web-server. What experiences have others had? Do you simply provide a working memory instance per session (how does this scale horizontally?). I also read that an Application Server runtime would be part of 3.2, is this true? * A rule authoring environment for end-users. I read on Mark Proctor's blogg that this is in development but is it set for inclusion in 3.2 and does it handle DSL too; otherwise we'd have to write out own? With kind regards, Michael Anstis ------------------------------------------- Next Generation Estimating System * Trafford House (Int) 8 718 2239 * Trafford House (Ext) +44 (0)1268 702239 * <mailto:manstis1@ford.com <mailto:manstis1@ford.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 ________________________________ _______________________________________________ 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