June 2014 - rules-users - Jboss List Archives

by dhartford

Hey all, I'm trying to dip some toes into the water with Drools, and have an application that would be a good start but having some understanding/lacking an appropriate example issue. The application context, let's say, is Mortgages, and already using the Mortgage rules that are stored in a running instance of Guvnor. Going back to 'toe in water', lets assume that all 'facts' are loaded on call (so nothing is pre-loaded, all data to run a rule is supplied at the time the rule is called). This is to make it easier to get started without jumping all-in just yet ;-) Using the mortgage business rule 'CreditApproval' that is already loaded into Guvnor, I can see passing the Application object, with the creditRating field/fact to a rule. However, instead of populating and returning a loanApplication object, how would I return just the decision/end result of a rule if it was only one value (the approved/not approved decision) from the java app? KnowledgeBase is loaded from the java app, but struggling with StatefulKnowledgeSession versus StatelessKnowledgeSession and how to simply get back the rule decision value (again, preferably without a specific object if it is only one value)? I'm also looking to only fire/execute one rule at a time for now until we get comfortable - any help for an app developer trying to ease their way into drools? Sorry if I not overly clear, still trying to learn the appropriate terminology :-) -Darren -- View this message in context: http://drools.46999.n3.nabble.com/app-dev-toe-in-water-help-please-tp3249... Sent from the Drools: User forum mailing list archive at Nabble.com.

18 hours, 59 minutes

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Effective Dating of Rules

by MaverickDrools

Is there a way to effective date a rule through a program? Requirement: without using the Guvnor UI to write the rules, trying to upload a .drl file using REST APIs which already has rules specified "without" the date-effective/date-expire attributes. Is there a way to maintain versions that could be used by effective dating the entire package itself? Or in general, how do we effective date the rules in Guvnor without using date-effective attributes for rules and create a knowledgebase from the package based on the current date? Thanks -- View this message in context: http://drools.46999.n3.nabble.com/Effective-Dating-of-Rules-tp4022422.html Sent from the Drools: User forum mailing list archive at Nabble.com.

1 week, 3 days

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drools-solver results question

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

1 month

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Build a Graphical Adventure Game in 20 minutes using JBoss Drools : All Hale the Wumpus

by Mark Proctor

http://www.dzone.com/links/build_a_graphical_adventure_game_in_20_minutes... Today we take you on a 20 minute adventure. Building, almost from scratch, a complete graphical adventure game with Drools. The code will be part of the up coming Drools 5.4 release. The game is based on Wumpus World, from the book Artificial Intelligence: a Modern Approach. All Hale the Wumpus Please vote up on the dzone

1 month, 1 week

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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, 3 weeks

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Drools beginner - unable to resolve method using strict-mode

by Stefan Schuster

Hi, I'm new to drools, and I made my first steps using the very nice video-tutorial "Build Pong in 13 minutes using JBoss Drools" found here: http://www.youtube.com/watch?v=Omj4PR3v-nI Eclipse shows building errors, but Pong start anyway. What does this error mean? in move.drl there is following rule: *<rule "Move Bat Up" timer(expr: bat.speed, bat.speed) no-loop when* * ui : PongUI( ready == true )* * ( KeyPressed( keyText == "A" ) and bat : Bat( playerId == PlayerId.PlayerOne, y > pconf.padding + pconf.sideLineWidth )* * or* * KeyPressed( keyText == "K" ) and bat : Bat( playerId == PlayerId.PlayerTwo, y > pconf.padding + pconf.sideLineWidth ) ) * * td : TableDirty( ) * *then * * tableG = ui.getTablePanel().getTableG();* * tableG.setColor( Color.BLACK ); // background* * tableG.fillRect( bat.x, bat.y, bat.width, bat.height );* * * * modify( bat ) { y = bat.y - 2 };* * tableG.setColor( Color.WHITE ); // background* * tableG.fillRect( bat.x, bat.y, bat.width, bat.height ); * * modify( td ) { dirty = true };* *end* the error message is: [Error: unable to resolve method using strict-mode: org.drools.spi.KnowledgeHelper.td<http://org.drools.spi.knowledgehelper.td/> ()] [Near : {... @Modify with( td ) { dirty = true }; ....}] in another File (ui.drl) TableDirty is defined: *declare TableDirty* * @propertyReactive* * dirty : boolean* *end* Any ideas what this error message means? And why can I start pong despite this error? Thanks a lot for helping me Stefan

5 months, 2 weeks

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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

5 months, 2 weeks

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Embedding Guvnor 6 Guided Editor

by rjr201

Hi, I'm looking to upgrade to the new kie workbench 6.. i really need to be able to embed the guided editor within my application. I've done this previously using the iframe approach. I can't seem to find any documentation on how to do this in the latest release. Sorry if i've overlooked any documentation on this. Any advice would be greatly appreciated.. Cheers. Rich. -- View this message in context: http://drools.46999.n3.nabble.com/Embedding-Guvnor-6-Guided-Editor-tp4028... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 6 months

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Persistence in Drools 6

by Steinmetz, Jean-Philippe

Hello All, I am trying to set up persistence for a standalone Drools (6.0.1.Final) application that uses JPA, Hibernate (4.3.5.Final) and Bitronix (2.1.4) via Spring (4.0.3.RELEASE). On the persistence side everything appears to be set up correctly. For my Drools session I use a KieContainer to create a new stateful session using an environment set up with the EntityManagerFactory and TransactionManager set. The problem that I am experiencing however is that nothing is getting persisted to the database. I have poured over the docs at least two dozen times and searched the net for anything related. Here is what my Spring context file looks like when creating the Drools session... <bean id="kReleaseId" factory-bean="kieServices" factory-method="newReleaseId"> <constructor-arg index="0" value="groupId"/> <constructor-arg index="1" value="artifactId"/> <constructor-arg index="2" value="1.0-SNAPSHOT"/> </bean> <bean id="kContainer" factory-bean="kieServices" factory-method="newKieContainer"> <constructor-arg index="0" ref="kReleaseId"/> </bean> <bean id="kEnvironment" factory-bean="kieServices" factory-method="newEnvironment"> <constructor-arg index="0"> <map> <entry> <key><util:constant static-field="org.kie.api.runtime.EnvironmentName.ENTITY_MANAGER_FACTORY"/></key> <ref bean="entityManagerFactory"/> </entry> <entry> <key><util:constant static-field="org.kie.api.runtime.EnvironmentName.TRANSACTION_MANAGER"/></key> <ref bean="jtaTransactionManager"/> </entry> </map> </constructor-arg> </bean> <bean id="kSession" factory-bean="kContainer" factory-method="newKieSession"> <constructor-arg index="0" ref="kEnvironment"/> </bean> Since the application is standalone I execute fireAllRules on the session at a regular interval (I use this instead of fireUntilHalt as it dramatically reduces the CPU load on the machine). With each call I wrap it in a transaction. Thus, the code looks as follows: while (!Thread.currentThread().isInterrupted()) { // Start a new transaction UserTransaction utx = utx = (UserTransaction)new InitialContext().lookup("java:comp/UserTransaction"); utx.begin(); // Tick the session kSession.fireAllRules(); // Close the transaction utx.commit(); // Sleep so that other applications can use the CPU try { Thread.sleep(1); } catch (InterruptedException e) { // When our sleep is interrupted it's because the executor wants us to shut down. Thread.currentThread().interrupt(); } } When I inspect kSession in the debugger I can see the environment is properly set. I have tried digging down into the execute a bit but can't find any point at which the TransactionManager or EntityManagerFactory are used. As I said above I know Hibernate is set up correctly as well as Bitronix. I can see them working just fine in the logs and they definitely are hitting the database (and create tables for sessioninfo and workingmemory as they should). I just get nothing actually in the database stored, ever. Any help here is appreciated. It seems like it should work but it just doesn't. Thanks in advance, Jean-Philippe Steinmetz

11 years, 6 months

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Ruleflow not working with stateless session in drools-server 5.5.0.Final

by tslonaker

I am running drools-server 5.5.0.Final and I am having a problem with stateless sessions and ruleflows. Only the first step in the ruleflow executes. There is a catch to my problem though. I have drools-server hosted in JBoss 7.1. If I restart the service by disabling and then enabling via the admin console then the ruleflow works correctly (all nodes hit) one time. So, it always works just after the service starts. Each time after the first rule execution it stops at the first ruleflow node. I am sending commands to the service in JSON format through the REST interface. If I send the same commands in the same order through Java / eclipse then the ruleflow works correctly every time. My problem sounds very similar to the problem described in the thread below: http://drools.46999.n3.nabble.com/RuleFlow-only-calling-first-RuleFlowGro... <http://drools.46999.n3.nabble.com/RuleFlow-only-calling-first-RuleFlowGro...> It looks like this problem was addressed in version 5.3.0 ( https://issues.jboss.org/browse/JBRULES-2718 <https://issues.jboss.org/browse/JBRULES-2718> ). -- View this message in context: http://drools.46999.n3.nabble.com/Ruleflow-not-working-with-stateless-ses... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 6 months

3
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rules-users June 2014