May 2013 - rules-users - Jboss List Archives

by kenneth.westelinck＠telenet.be

Dear list, I am using spring to configure drools inside my application. In 5.5.0 I used: <drools:resource id="resource1" type="DRL" source="classpath:Sample.drl" /> <drools:kbase id="kbase1"> <drools:resources> <drools:resource ref="resource1" /> </drools:resources> <drools:configuration> <drools:mbeans enabled="true" /> <drools:event-processing-mode mode="STREAM" /> </drools:configuration> </drools:kbase> <bean id="ruleTemplate" class="a.b.c.KnowledgeTemplateImpl"> <constructor-arg ref="kbase1" /> </bean> I was able to get a new session with the following code: public class KnowledgeTemplateImpl { private KnowledgeBase knowledgeBase; protected StatefulKnowledgeSession newStateFulSession() { return knowledgeBase.newStatefulKnowledgeSession(); } protected StatelessKnowledgeSession newStatelessSession() { return knowledgeBase.newStatelessKnowledgeSession(); } KnowledgeBase has become deprecated now. Any pointers to its replacement? Or should I just RTFM :) regards, Kenneth

12 years, 6 months

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failed to load module

by justin

when i startup the guvnor in eclipse it will notice me the error [ERROR] [org.drools.guvnor.Guvnor] - Failed to load module 'org.drools.guvnor.Guvnor' from user agent 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E; LBBROWSER)' at genuine.microsoft.com:49806 any help? thanks justin -- View this message in context: http://drools.46999.n3.nabble.com/failed-to-load-module-tp4024005.html Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 6 months

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What's Coming in Drools 6.0 Slides

by Mark Proctor

http://blog.athico.com/2013/05/whats-coming-in-drools-60-slides.html --- Recently I gave a talk at the London JBUG, on what's coming in Drools 6.0. Those slides are now available online. HTML export from Keynote (apparently some firefox issues, but fine in Safari and Chrome): http://docs.jboss.org/drools/blog/LondonJBUG2013rulesmarkp/assets/player/... Here are some relevant videos: Drools and Guvnor demo http://blog.athico.com/2013/05/drools-and-guvnor-beta3-video.html Backward Chaining and Reactive Transitive Closures http://blog.athico.com/2013/05/backward-chaining-and-reactive.html

12 years, 6 months

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[Optaplanner] No-arg constructor for BendableScoreDefinition

by jonathan.labin

Is there an example that uses BendableScore? I'm trying to convert my app from using HardSoftScore to BendableScore and I've run into my first issue: Changing from: @XStreamConverter(value = XStreamScoreConverter.class, types = {HardSoftLongScoreDefinition.class}) to @XStreamConverter(value = XStreamScoreConverter.class, types = {BendableScoreDefinition.class}) throws: Caused by: java.lang.IllegalArgumentException: The scoreDefinitionClass (class org.optaplanner.core.impl.score.buildin.bendable.BendableScoreDefinition) does not have a public no-arg constructor. The answer to this issue would be helpful but I'll probably hit other bumps along the way. Does anyone have an example that uses BendableScore? Thanks, Jon -- View this message in context: http://drools.46999.n3.nabble.com/Optaplanner-No-arg-constructor-for-Bend... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 6 months

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G+ HashTags

by Mark Proctor

G+ now supports hashtags. https://marketingland.com/up-close-with-the-new-google-related-hashtags-4... This means anyone can write a small Drools or jBPM article, and get association via the use of a hashtag. So if you write anything about Drools, jBPM, OptaPlanner, Uberfire etc, please do hashtag it. Here is the list we are using now: #Drools #jBPM #Guvnor #UberFire #OptaPlanner I'm currently trying to encourage all developers to keep small diary entries, and use hashtags, so people can get a feel for work being done. Mark

12 years, 6 months

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entry-point + accumulate in same rule using BRL (Guided Rule Editor)

by Ravi Gupta

I can't seem to re-create the below in BRL (entry-point + accumulate) I want to combine an entry-point and an accumulate function such as (the below is DRL, which works) *rule "GSS-Sev1-Monitor"* * no-loop true* * dialect "mvel"* * when* * $ticketStatistics : TicketStatistics( $ID : ID == null )* * accumulate($supportTicket:SupportTicket( ticketStatisticsID == $ID , severity == "Sev-1" ) over window:time (5m) from entry-point "gss-support-stream", $num : count( $supportTicket ))* * then* * $ticketStatistics.currentTicketCount = $num;* * update( $ticketStatistics );* * end* I can't seem to re-create this in Guvnor (BRL)

12 years, 6 months

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What's new in Drools 6.0

by Mark Proctor

Here are some slides from the other night, I can't put them up on slideshare, as it has some video's in it. The URL is temporary, until i find a permanent location for them. https://www.dropbox.com/sh/4hxfxb2ho44f0el/10ASoNbCB9 Mark

12 years, 6 months

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Shadow fax

by ronan.quintin

Hello, First of all i have to appologise for this horrible joke, but i think you understand that i'm interrested in shadow facts. I read that theses lazy facts proxy were introduced in Drools 4 in order to make the rule engine/working memory consistent. I have some questions about the general implentation of shadow facts in drools 5.4 : - Did the shadow facts been implemented since version 4, or was it earlyier? - Are the shadow facts still implemented in drools 5.4 final? - How the mapping between the fact fields and the proxy fields is implemented ? By this i want to know all fields are copy when the fact is insert into the session. - Is there the possibility to disable shadow facts ? You have to know that we get the knowledgeBase through a knowledgeAgent which Thank you. -- View this message in context: http://drools.46999.n3.nabble.com/Shadow-fax-tp4023948.html Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 6 months

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Drools eval and variable assigning.

by droolsNewbie

I need a little help with Drools eval and variable assigning. rule "check that no previously submitted requests exist" when $user : UserFormField( name == 'employeeId', value != null ) $repository : Repository( ) $activeRequests : List( ) from $repository.findActiveRequestsByEmployee( $user.getValue() ) # call to repository eval( $activeRequests.size() > 0 ) then System.err.println(' You have active requests: ' + ((Request)$activeRequests.get(0)).getTitle); insert(Boolean.TRUE); end In this rule I try to access repository and get active requests for current user. Rule compiles and executes without any exceptions or warnings. In debug mode it can be seen that repository returns non empty list and I expect to see console message 'You have active requests' but this doesn't happen. I think the problem is in this line $activeRequests : List( ) from $repository.findActiveRequestsByEmployee( $user.getValue() ) because this rule works fine rule "check that no previously submitted requests exist" when $user : UserFormField( name == 'employeeId', value != null ) $repository : Repository( ) eval( $repository.findActiveRequestsByEmployee($user.getValue()).size() > 0 ) then System.err.println(' You have active requests !' ); insert(Boolean.TRUE); end So could someone point me how to solve this problem? Thanks! -- View this message in context: http://drools.46999.n3.nabble.com/Drools-eval-and-variable-assigning-tp40... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 6 months

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Fire rule only upon change of particular event (or fact)

by Jörg Henne

Hi all, after using drools for some time now, I have repeatedly stumbled upon situations where it would have been useful to be able to tell Drools to fire a rule only upon the insertion of a particular event, but not other events/facts on which the rule depends. It might be that I am hopelessly mis-guided, but I would like to float an idea and see what you think. To illustrate what I am talking about, please consider the following rules: ------------------------------------------------------------------------------------------------------------ package test declare SomeEvent @role(event) name: String end declare SomeFact @role(fact) name: String end rule "Trigger on some event when there is some fact" when e: SomeEvent() f: SomeFact() then System.out.println("=> Got Event '" + e.getName() + "' and Fact '" + f.getName() + "'"); end rule "Discard 'used' events" salience -99999 when e: SomeEvent() then retract(e); end ------------------------------------------------------------------------------------------------------------ Now we insert facts and events, for example like this ------------------------------------------------------------------------------------------------------------ rule "Insert fact" when then System.out.println("Inserting initial Fact"); insert(new SomeFact("initial fact")); end rule "Insert an event" timer(int: 5s) when then System.out.println("Inserting initial Event"); insert(new SomeEvent("initial event")); end rule "Insert yet another fact" timer(int: 10s) when then System.out.println("Inserting yet another fact"); insert(new SomeFact("yet another")); end rule "Insert yet another event" timer(int: 10s) when then System.out.println("Inserting yet another event"); insert(new SomeEvent("yet another")); end ------------------------------------------------------------------------------------------------------------ The result of running those rules is, of course: ------------------------------------------------------------------------------------------------------------ Inserting initial Fact Inserting initial Event => Got Event 'initial event' and Fact 'initial fact' Inserting yet another fact => Got Event 'initial event' and Fact 'yet another' Inserting yet another event => Got Event 'yet another' and Fact 'yet another' => Got Event 'yet another' and Fact 'initial fact' ------------------------------------------------------------------------------------------------------------ Please note the output does not match the name of the rule "Trigger on some event when there is some fact". In fact, this rule fires irrespective of whether an event is inserted or a fact. But what I really want is, that it just fires upon the 'arrival' of events. A possible syntax extension whould be something along the lines of: ------------------------------------------------------------------------------------------------------------ rule "Trigger on some event when there is some fact" when upon(e: SomeEvent()) f: SomeFact() then System.out.println("=> Got Event '" + e.getName() + "' and Fact '" + f.getName() + "'"); end ------------------------------------------------------------------------------------------------------------ The expected output of that would be: ------------------------------------------------------------------------------------------------------------ Inserting initial Fact Inserting initial Event => Got Event 'initial event' and Fact 'initial fact' Inserting yet another fact Inserting yet another event => Got Event 'yet another' and Fact 'yet another' => Got Event 'yet another' and Fact 'initial fact' ------------------------------------------------------------------------------------------------------------ There are work-arounds that let me achieve the desired behaviour, for example this one: ------------------------------------------------------------------------------------------------------------ rule "Focus on 'process SomeEvent'" agenda-group "process SomeEvent" auto-focus when e: SomeEvent() then // nothing to do but focus the agenda-group end rule "Trigger on some event when there is some fact" agenda-group "process SomeEvent" when e: SomeEvent() f: SomeFact() then System.out.println("=> Got Event '" + e.getName() + "' and Fact '" + f.getName() + "'"); end ------------------------------------------------------------------------------------------------------------ However, I think the hypothetical 'upon'-keyword would be a lot clearer. Is there any fundamental reason (e.g. rooted in the rete-algorithm or the way Drools implements it) that would preclude the implementation of 'upon'? And, more importantly, do you even agree with me that it would be a useful extension? Please note that while I always spoke of events in conjunction with 'upon' I don't see a reason why it should not behave this way with plain facts as well. Please not as well that the inverse of upon would also be conceivable: "don't fire this rule just because <some pattern> triggered", e.g. maybe simply "not(upon(Pattern()))". Thanks Joerg Henne -- View this message in context: http://drools.46999.n3.nabble.com/Fire-rule-only-upon-change-of-particula... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 6 months

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rules-users May 2013