October 2010 - rules-users - Jboss List Archives

by Andrew Waterman

Hello, I'm starting to work with the drools-solver to help on a gaming project. Basically, we have a game that works in two modes: 1) a competitive game where humans (or agents) compete with one another on a well defined game board to achieve 24 points by using three (or four) agricultural development tokens. 2. A puzzle, where all 4 players work cooperatively to create an equitable solution, where all 4 players win with at least 24 points by means of our agricultural development tokens. I am starting to work with drools-solver to address the puzzle part of our game. Basically, we are interested in having the solver do two things for us: a) find the optimal solution for our game/puzzle, based upon our requirements [this part seems quite straightforward] and b) getting the total number of solutions that satisfy our constraints. We would like, as well, to be able to inspect these other, sub-optimal, solutions, in order to explore our game and puzzle further. From my reading of the "Solver" API , it looks like we will only be able to get the optimal solution. Does anyone have any suggestions for a workaround in this case? Or is there some functionality in the solver that I am missing? I look forward to your feedback. best wishes, Andrew --------------------------------- Andrew Waterman San Cristóbal de las Casas, Chiapas, Mexico

2 weeks

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Need help with setFocus

by new2drools

Hi All, Need some help with understanding setFocus. I have the following use case: if (condition1) { if (condition2) { } else if (condition3) { } else if (condition 4) { } } if (condition5) { if (condition2) { } else if (condition3) { } else if (condition 4) { } } I created 3 rules (rule2, rule3, rule4) for checking condition2, condition3, condition4 and created 1 agenda group (groupX) for them. I created 2 rules (rule1, rule5) for checking condition1, condition5 and created 1 agenda group(groupY) for them. rule "rule1" agenda-group "groupY" when // then drools.setFocus("groupX"); end rule "rule3" agenda-group "groupX" activation-group "someActiveGroup" when // then // end >From the java code: ksession.getAgenda().getAgendaGroup("groupY").setFocus(); Problem: The first time, drools.setFocus("groupX") is invoked, I see that it's working fine. rule2 or rule3 or rule4 get triggered. But, the SECOND time that drools.setFocus("groupX") is invoked, I don't see that any rule in agenda-group groupX is being invoked...even though one of the rule's LHS explicitly matches...thinking that the activation-group is cancelling all the activation's (after one rule in that activation group is fired), I even removed the activation-group statement. But, it didn't help...ideally, I would like to bunch rule2, rule3, rule4 in one activation group. Can you please let me know as to why the second invocation of setFocus is not working? I even tried to remove everything in LHS of rule2/3/4, to see if the second invocation would work...it doesn't... Thanks!! -- View this message in context: http://www.nabble.com/Need-help-with-setFocus-tp24177742p24177742.html Sent from the drools - user mailing list archive at Nabble.com.

1 month

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conways game of life

by Mark Proctor

For anyone looking for a good and complex example on how to write rules properly, please look at Conways Game of Life in drools-examples, for extra bonus points compare it to the old version in M1. You'll see nearly all the logic is moved from java to the drl and we have removed the need for nested objects by using objects relaitionally, which also allows us to exploit cross products to drive the application. Mark

4 months, 4 weeks

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Starting resource change scanner and notifier in drools-server.

by Graham Thomson

Hi, I would like to ask for help with setting up drools-server with Guvnor. I am using version 5.1.1 of both. I am trying to set up an instance of drools-server in Tomcat that periodically loads new updates of packages published in Guvnor (both drools-server and Guvnor run in the same instance of Tomcat). My change set definition is as follows: <?xml version="1.0" encoding="UTF-8"?> <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/...'> <add> <resource source='http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/<one of my packages>/LATEST' type='PKG' basicAuthentication="enabled" username="<username>" password="" /> <resource source="http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/<another of my packages>/LATEST" type="PKG" basicAuthentication="enabled" username="<username>" password="" /> </add> </change-set> My knowledge-services.xml configuration is as follows (based on the unit test examples highlighted in http://article.gmane.org/gmane.comp.java.drools.user/20992/match=drools+s...): <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:drools="http://drools.org/schema/drools-spring" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://drools.org/schema/drools-spring http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-containe..."> <drools:resource-change-scanner id="s1" interval="5" /> <drools:execution-node id="node1" /> <drools:ksession id="ksession1" type="stateless" kbase="kbase1" node="node1"/> <drools:kbase id="kbase1" node="node1" /> <drools:kagent id="kagent1" kbase="kbase1"> <drools:resources> <drools:resource type="CHANGE_SET" source="classpath:changeset.xml" /> </drools:resources> </drools:kagent> </beans> On loading drools-server, the resources listed in the change set are loaded and available. The problem is that when a new package built and published in Guvnor, drools-server does not detect this and update itself. The effect is the same as if a KnowledgeAgent were used locally and ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); were not called. This leads me to the assumption that drools-server does not start these services by default. My question is then can/how do I configure drools-server to start these services such that it will update new changes from Guvnor automatically? Thanks a lot for any help you can offer, Cheers, Graham.

11 years, 10 months

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Error Inserting events into drools fusion stream

by Ayush

Hi All, I'm trying to implement drools fusion into my app. The scenario of my app is as follows: - Facts will be received continuosly. - On receving fact I'm generating a new event and adding it into a new working memory entry point stream. Also I'm adding facts into session coz I'll be updating them. - I need to apply rules on continuous stream of events. - I've not used any camel + spring or pipeline. Are these mandatory to use? For 1st fact everything works fine but when I receive 2nd fact I'm getting Now when I'm trying to get entry point on receive of 2nd alarm I'm getting org.drools.RuntimeDroolsException: Unexpected exception executing action org.drools.reteoo.PropagationQueuingNode$PropagateAction@9ff411 Caused by: java.util.concurrent.RejectedExecutionException. On debug I found that the above exception is coming when I'm calling session.getWorkingMemoryEntryPoint("MyStream"); Can anyone please help me that how should I insert facts and events into working memory? I'd invested ample amount of time searching for this but I'm empty handed. Guys please help this is very urgent for me. Thanks in anticipation -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Error-Inserting-event... Sent from the Drools - User mailing list archive at Nabble.com.

12 years

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how to debug rules in JBoss AS?

by Marina

Hello, I know one can debug rules (put breakpoints in .drl and ruleflow files) when running/debugging an application as a Drools Application. However, I would like to debug rules when my application is running in JBoss AS - just like we do a normal debugging of a Remote application running in a different JVM ,by enabling the JDWP on the server (-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n) and then connecting to the specified port. Basically, I would like to be able to debug both my Java classes and rules together. Is it possible? thanks, Marina

12 years, 7 months

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FW: Implementation of expert system

by Binyala, Krishna Gopal IN BLR SISL

Hello, I am new to drools community... I want to develop an expert system for medical application using drools. can you please let me know how to use history data in drools... Because as far as i know we have to keep all the data in the working memory to access. How should i implement such system? Would be better if you can provide some reference to existing expert system implemented using drools. Thanks in advance. Krishna Gopal In three words I can sum up everything I've learned about life: it goes on... Important notice:This e-mail and any attachment thereto contains corporate proprietary information. If you have received it by mistake, please notify us immediately by reply e-mail and delete this e-mail and its attachments from your system. Thank You.

13 years, 1 month

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enquiry on drools webservice

by Prem Kumar L

13 years, 4 months

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java.lang.OutOfMemoryError: Java heap space

by vdelbart

Hello, In my tests of the 4.0.3, I have some : java.lang.OutOfMemoryError. So, I try a simple test with 10.000 sequential execution of 1 rule with no context and just a workingmemorylogger and I have the error : java.lang.OutOfMemoryError: Java heap space My code is : public class ExecReglesMemotyTest { private static final Reader DRL = new InputStreamReader(ExecReglesMemotyTest.class .getResourceAsStream("/rules/exemple.drl")); private static final String FICHIER_LOG = "session"; /** * @param args */ public static void main(String[] args) { try { PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl(DRL); RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(builder.getPackage()); for (int i = 0; i < 10000; i++) { StatefulSession session = ruleBase.newStatefulSession(); WorkingMemoryFileLogger logger = new WorkingMemoryFileLogger(session); logger.setFileName(FICHIER_LOG); session.fireAllRules(); logger.writeToDisk(); session.dispose(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } with this rule (doesn't matter): #created on: Fri Nov 09 15:48:45 CET 2007 package initPackage #list any import classes here. rule "ERG9" when then end I try this in 4.0.1, and it's working (no OutOfMemoryError) What's the problem ? thanks for any information, V. -- View this message in context: http://www.nabble.com/java.lang.OutOfMemoryError%3A-Java-heap-space-tf477... Sent from the drools - user mailing list archive at Nabble.com.

13 years, 4 months

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Problem with gateway(diverge) executing first

by Jian Feng Ng

13 years, 6 months

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rules-users October 2010