March 2011 - rules-users - Jboss List Archives

Mythic Game Project Addition Artificial Intelligence and Quest System Components

by Mark Proctor

http://blog.athico.com/2011/01/mythic-game-project-addition-artificial.html "In this project, we describe the design decisions and principles behind the arti cial intelligence (AI) for a multiplayer online role playing game, and our use of an expert system to implement it. We explain how we organize AI rules into les, how those rules are assembled from a database, how AI is assigned to entities, the di erent types of AI, the di erent phases of AI, and how we manage facts used by AI. We also review some of the history behind the Mythic project, where it is headed, what an expert system is and why we chose to use one for our project. The result of our project is a design that allows us to have diverse AI behavior and exibility to reuse code to create new behaviors, but may prove to be ineffcient if implemented on systems with many players or many instances of AI running."

14 years, 8 months

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Problem in DSL with Type constraints

by Leonardo Gomes

Hi, Given the following DSL definition: [condition][RestrictedLocation]Is restricted by = ArrayList(size >= 1) from > collect(RestrictedLocation() from $restrictedLocationList) > [condition][RestrictedLocation]- test=$test : test > and the following rule: rule "Test" > when > Is restricted by > - test > then > ... > end > I'm getting the following DRL: rule "Test" > when > ArrayList(size >= 1) from collect( RestrictedLocation*(, $test : test > ) *from $restrictedLocationList) > then > ... > end > Note the comma before the restriction: ** (, ** Anyone would know how to fix that? Thanks a lot, Leonardo.

14 years, 8 months

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Test Scenarios with Rule Flows in 5.1.1 Guvnor

by John Peterson

Hi all, I had (hopefully) a quick question about trying to test rules in rule flows in Guvnor with Drools 5.1.1. I have a simple 4 step rule flow (Start-RuleGroup1-RuleGroup2-End) with 1 rule in each Rule group. When I set up the test scenario to fire the first rule, which will trigger the second rule, activate "RuleGroup1", and run the scenario, it doesn't trigger the RuleFlow and fire the rule. I've also tried activating "Start" instead, but neither of them trigger the RuleFlow. I know from experience that Rule Flows don't seem to work with 5.0, but with the addition of the entry options, I thought they would with 5.1.1. Am I mistaken? Also, when I look at the Audit Log, I see the Rule Flow activated and deactivated before any of the facts are asserted: BEFORE RULEFLOW GROUP ACTIVATED group:Start[size=0] AFTER RULEFLOW GROUP ACTIVATED group:Start[size=0] BEFORE RULEFLOW GROUP DEACTIVATED group:Start[size=0] AFTER RULEFLOW GROUP DEACTIVATED group:Start[size=0] OBJECT ASSERTED value:com.test.Game@47244724 factId: 1 OBJECT ASSERTED value:com.test.Customer@4c584c58 factId: 2 Could this be part of the problem? Thanks!

14 years, 8 months

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[planner] Hard constraints in drl, MoveFactory or isMoveDoable

by Evert Penninckx

Hi General question on the drools planner. If I'm not mistaken, I see three ways to impose hard constraints: 1. Generate violations in the scoring DRL. 2. Check them in isMoveDoable 3. Do not create moves in the MoveFactory which cause hard constraints to be broken. For safety I would always add a check in the DRL (1) in combination with 2 or 3 if possible. I assume that checks in isMoveDoable are more expensive in terms of performance and should only be put there if they can vary with each solution. Does this make sense? Evert -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/planner-Hard-constrai... Sent from the Drools - User mailing list archive at Nabble.com.

14 years, 8 months

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Moving Rules and/or Packages from one Guvnor instance to another

by Dean Whisnant

Hello, My Guvnor development environment has 2 servers, DEV and TEST. A typical lifecycle includes Business Analysts and developers authoring rules on DEV in multiple packages and then doing releases to the TEST server for our QA folks to verify our work. Eventually, we will also bring our production server into the mix once QA is complete. It is somewhat painful to move rules between servers as the only 100% successful method I have is to use guvnor's export/import feature that exports the entire repository and the restores it in my TEST environment. I dislike the opportunity that someone has changed or is in the middle of changing a rule in package B on the DEV server and when I deploy to TEST changes for package A, the package B rules move as well. Does anyone have a reliable method of moving individual rules between servers? How about moving just the contents of one package? I downloaded and used a tool called Cyberduck and it seemed to do things well, but when moving from one server to another we lose the categories on the individual rules. Any thoughts are appreciated. Thanks Dean

14 years, 8 months

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Drools plugin for Grails

by Pablo Nussembaum

Hey All, I just released a new version of the drools-gorm plugin based on the lastest stable version of Drools and jBPM 5. Feel free to use and report bugs! ;-) Thanks!, -- Bauna

14 years, 8 months

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Some question about Drools

by Carlos Santiago Moreno

Hi everyone, I have been working out with Drools, and a few more doubts have appeared. In Guvnor, each rule is defined inside a package. When you create a new rule you must define the package where it belongs. Guvnor doesn't create any kbase, you can see a package (in Guvnor) like a DRL file split in different parts: the imports, the globals, each rule, etc. So Guvnor is only in charge of maintain different versions of that DRLs. 1) Can this be done dynamically? I meant, will the workflow change as soon as I save the new rules on any pre-existing package? If I declare the entities in Guvnor, this will use the "declare" keyword to define a New Data Type. Now... 2) Would this allow me to add workflow steps and rules as well as general data entities? and, the last one 3) What should I have in me interface to be able to use Drools as me rules engine? I don't get it yet... And if you can recomend me any web site with information about all this things it'll be nice. Thanks Carlos S. Moreno

14 years, 8 months

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StatefulKnowledgeSession Vs StatefulSession

by DeepakA

I used a KnowledgeBuilder ro read the resources (DSL & DSLR files) Then created a KnowledgeBase and created a StatefulKnowledgeSession out of the KnowledgeBase. The StatefulKnowledgeSession was used to start the process and fire all rules. Then I realized I was not able to access the RuleBase from StatefulKnowledgeSession. So, now I create a RuleBase, then a PackageBuilder, add the resources to the packageBuilder, then add the package to the RuleBase and create a StatefulSession out of the RuleBase. This statefulsession is used to start the process and fire all rules. Can someone explain to me whats the difference in the above 2 methods of firing the rules. Whats the difference between StatefulKnowledgeSession & StatefulSession. -- View this message in context: http://old.nabble.com/StatefulKnowledgeSession-Vs-StatefulSession-tp26511... Sent from the drools - user mailing list archive at Nabble.com.

14 years, 8 months

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FAIL - getProcessInstances() from persisted StatefulKnowledgeSession

by Anderson Neves

Hi everybody. I configured the session persistence and persisted an instantiated process. When I get the session from the database and use the method getProcessInstances(), it returns an empty collection. But, when I call getProcessInstance(1), and 1 is the InstanceId of the ProcessInstanceInfo (table that contains the process instance), I get the correct process instance. Is this a bug? See the code below. statefulSession = JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, knowledgeBase, null, environment); Collation<ProcessInstance> processInstances = statefulSession.getProcessInstances(); // FAIL - return empty collection ProcessInstance processInstance = statefulSession.getProcessInstance(1); // OK - return the process instance Regards, Anderson

14 years, 8 months

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Problem with CommandFactory.newStartProcess in 5.2 M1

by Seaver, Daniel (GE Healthcare)

There appears to be a problem with CommandFactory.newStartProcess in Drools 5.2 M1. If I do this: String someString = "Some String"; Map<String, Object> variables = new HashMap<String, Object>(); variables.put("someString", someString); List<Command<?>> cmds = new ArrayList<Command<?>>(); cmds.add(CommandFactory.newStartProcess("SampleFlow", variables)); cmds.add(CommandFactory.newFireAllRules()); The default value for the someString variable in SampleFlow does NOT get updated. However, if I do this: String someString = "Some String"; Map<String, Object> variables = new HashMap<String, Object>(); variables.put("someString", someString); List<Command<?>> cmds = new ArrayList<Command<?>>(); StartProcessCommand cmd = new StartProcessCommand(); cmd.setProcessId("SampleFlow"); cmd.setParameters(variables); cmds.add(cmd); cmds.add(CommandFactory.newFireAllRules()); the someString variable does get updated. However, StartProcessCommand is not intended to be used (Discouraged Access), so I don't want to use this solution. Dan

14 years, 8 months

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rules-users March 2011