March 2007 - rules-users - Jboss List Archives

by vanitha

hi Ronald could you mail the syntax of iterating the list in DSL file. i have a issue regarding the list iteration which i have to perform in the "when" syntax so that "then" is executed after all the objects in the list are iterated. could you tell me the DSL syntax for this? thanks and regards vanitha Ronald R. DiFrango-2 wrote: > > All, > > Is the "Conway's Game Of Life Example" the best or only example of how to > process a list of objects that you need to evaluate? > > http://drools.org/Conway%27s+Game+Of+Life+Example<http://drools.org/Conway%2527s+Game+Of+Life+Example> > > Thanks in advance, > > Ron > > -- View this message in context: http://www.nabble.com/List-Processing-tf1286616.html#a9284307 Sent from the drools - user mailing list archive at Nabble.com.

18 years, 10 months

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list iteration

by vanitha

hi i want to know how to iterate a list in the DSL file so that the "then" syntax is executed after the whole list has been iterated. -- View this message in context: http://www.nabble.com/list-iteration-tf3338183.html#a9284083 Sent from the drools - user mailing list archive at Nabble.com.

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to execute a DSL with "exists"

by vanitha

hi could you tell me where to write the code for iterating the list so that "exists" works properly i.e in which class [the rule executor class or a separate class] the objects have to be added to the list and iterated. how and where does "exists" go and check for the list? my dsl syntax is : [when]if {value1} is present in one box=exists List(num=={value1}) [then]set the error message as {value3}=e.setErrormessage({value3}); -- View this message in context: http://www.nabble.com/to-execute-a-DSL-with-%22exists%22-tf3338153.html#a... Sent from the drools - user mailing list archive at Nabble.com.

18 years, 10 months

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confused again.... - why it selects all possible combinations? (D ROOLS 3.1M)

by Olenin, Vladimir (MOH)

Hi, I finally got around to get my hands dirty. And I run into some problem. The results I'm getting are not the ones I expected to get :-). I have a rule: rule "FC.93" when r1: Record( psc == "101", fundType == "1", $pa1: pa == "7111010", sa matches "F1202[0-9]" ) r2: Record( psc == "101", fundType == "1", pa == $pa1, sa matches "F1202[0-9]" ) then System.out.println( "rule FC.93 has been activated" ); System.out.println( "r1: " + r1 ); System.out.println( "r2: " + r2 ); System.out.println(); end and the following set of facts: 1: new Record("101", "0942", "1", "7111010", "F12020") 2: new Record("101", "0942", "1", "7111010", "F12022") 3: new Record("101", "0942", "1", "7111010", "F12024") 4: new Record("101", "0942", "1", "7111020", "F12020") 5: new Record("101", "0942", "1", "7111020", "F12022") With the rule above I expected to get only tuples 1,2 1,3 2,3 Or the printout: rule FC.93 has been activated r1: pa = 7111010, sa = F12020 r2: pa = 7111010, sa = F12022 rule FC.93 has been activated r1: pa = 7111010, sa = F12020 r2: pa = 7111010, sa = F12024 rule FC.93 has been activated r1: pa = 7111010, sa = F12022 r2: pa = 7111010, sa = F12024 Ie, get only 3 activations of the rule. For some reason I'm getting all possible combinations (or is it permutations?...): rule FC.93 has been activated r1: pa = 7111010, sa = F12024 r2: pa = 7111010, sa = F12024 rule FC.93 has been activated r1: pa = 7111010, sa = F12022 r2: pa = 7111010, sa = F12024 rule FC.93 has been activated r1: pa = 7111010, sa = F12024 r2: pa = 7111010, sa = F12022 rule FC.93 has been activated r1: pa = 7111010, sa = F12020 r2: pa = 7111010, sa = F12024 rule FC.93 has been activated r1: pa = 7111010, sa = F12024 r2: pa = 7111010, sa = F12020 rule FC.93 has been activated r1: pa = 7111010, sa = F12022 r2: pa = 7111010, sa = F12022 rule FC.93 has been activated r1: pa = 7111010, sa = F12020 r2: pa = 7111010, sa = F12022 rule FC.93 has been activated r1: pa = 7111010, sa = F12022 r2: pa = 7111010, sa = F12020 rule FC.93 has been activated r1: pa = 7111010, sa = F12020 r2: pa = 7111010, sa = F12020 I recall Edson mentioned that DROOLS would not select the same two facts in the tuple, but that what seems to be happening.... I think I must be doing smth wrong. How the rule should be modified to achieve the result I expect? Also, for some reason regex "F1202\\d" doesn't return any matches as well, while, supposedly the same pattern "F1202[0-9]" does... Thanks. Any hints are very appreciated! Vlad PS: I'm using DROOLS 3.1M on JDK 1.5.0_11 under the 3.1M Eclipse plugin.

18 years, 10 months

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Writing rules using java..

by Kolla, Sandeep

I am very new to rules engine. The requirement for our project is store and retrieve rules from the database.This makes the rules engine to directly interact with the Database, to do so is there any way that I can use the rules api to set the rules. For example something like Creating a rule. Rule rule = new Rule(name); Rule.setSaliance(1); Similarly I don't find any api's to set the conditions and the consequences. I did extensive googling but couldn't find the right answer.. I would appreaciate if some could help me with this scenario. Thanks in advance, Sandeep.

18 years, 10 months

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retracting a fact after all interested rules have fired??

by Justine Hlista

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!

18 years, 10 months

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Using Java to write rules?

by Aeinehchi Nader

I wonder if it is possible to write rules and make queries toward the knowledge database of Jboss Rules using Java language itself. What I need is to to be able to access the rule engine's API. I do not want to use Drools language or XML. Thanks > Vennlig hilsen/Best regards > Nader Aeinehchi > Sjefsarkitekt /Chief Architect > EDB Business Partner Norge AS > Telefon: +47 22 52 80 80, Direkte + 47 23 32 02 88, mobil: +47 41 44 29 57 > E-post: nader(a)edb.com > <http://www.edb.com <http://www.edb.com/> > > "EDB - En sterk og nær IT-partner" >

18 years, 10 months

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need help to convert .drl files to XML

by Niloy Debnath

hi, how do i use xml tool and API's provided by JBOSS Rules to convert rule files (.drl) to xml files.I know schema definition for XML for representing the rules that already jboss has but i cant understand where i write my XML file and how to run that XML.I'm using Eclipse.Please help me.Its urgent. thanking you, Niloy --------------------------------- Heres a new way to find what you're looking for - Yahoo! Answers

18 years, 10 months

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Globals usage in functions and LHS ( when ... )

by Sergio Szychowski

Hi, I try using globals in functions but I get un error, Exception in thread "main" org.drools.rule.InvalidRulePackage: Function Compilation error at org.drools.rule.Package.checkValidity(Unknown Source) at org.drools.common.AbstractRuleBase.addPackage(Unknown Source) at org.drools.examples.TroubleTicketExample.main(TroubleTicketExample.java:24) Example:.. package org.drools.examples import org.drools.examples.TroubleTicketExample.Customer; import org.drools.examples.TroubleTicketExample.Ticket; global java.util.Date mydate; ... function java.util.Date fmydate() { return mydate; } ... besides when I try to using in LHS, I get another error Escalate:Unable to return Declaration for identifier 'mydate' drools-examples/src/main/rules/org/drools/examples TroubleTicket.drl line 51 package org.drools.examples import org.drools.examples.TroubleTicketExample.Customer; import org.drools.examples.TroubleTicketExample.Ticket; global java.util.Date mydate; rule "Escalate" when customer : Customer( object == mydate ) and ticket : Ticket( customer == customer, status == "Escalate" ) then sendEscalationEmail( customer, ticket ); end So, I can use globlas only in RHS, ( then ...), this is true??? Greetings.

18 years, 10 months

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Re: Re: Newbie: Is this feasible w/ Drools?

by Alexander Richter

Edson, Thank you for your prompt reply. It's good to know that I can dynamically add rules to a rulebase. With regard to a 'rule hierarchy', I'm actually referring to the fact that our assertions often build on each other. I'd really like to be able to define the rules only once, but be able to see the (sub-) rules and facts that make up an assertion. E.g: 'Glutathione Biosynthesis' is asserted YES if we have both 'Glutamate- Cysteine Ligase' AND 'Glutathione Synthetase'. 'Glutamate-Cysteine Ligase' is asserted YES if we find any of 4 different annotations (facts). 'Glutathione Synthetase' is asserted YES if we find any of 2 different annotations (facts). We need to see all assertions related to an annotation, all the way up the inference chain. Likewise, since we'd like to define the rules only once (in Drools), it's important to be able to see all the steps that made up the inference chain to 'Glutathione Biosynthesis'. Thanks, Alex P.S. What's a POC? > Date: Wed, 28 Feb 2007 21:17:25 -0300 > From: Edson Tirelli <tirelli(a)post.com> > Subject: Re: [rules-users] Newbie: Is this feasible w/ Drools? > To: Rules Users List <rules-users(a)lists.jboss.org> > Message-ID: <45E61B95.8090603(a)post.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > > Alexander, > > Seems a really interesting project indeed! > Trying to answer: > > 1. I'm not sure what you mean by "rule hierarchy". Drools does not > support rule "inheritence" if that is what you mean by hierarchy... > can > you please ellaborate? > > 2. Dynamically adding rules to a rulebase will not force a full > reevaluation. Only the new rules are evaluated and if they eventually > have Patterns that may be shared, they are not even evaluated, as they > already were. > > The problem I think you will face is that Drools does not support > uncertanty reasoning. You will need to code uncertanty by hand if you > use drools. I suggest you a POC to check how it goes. > > []s > Edson > -- > 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

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rules-users March 2007