March 2011 - rules-users - Jboss List Archives

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

2 months

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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, 7 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.

11 years, 9 months

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Date equal comparison fails - don't understand why

by Saloojee, Karim

Hi I am comparing SimpleAccount( dateAccountOpened == "5-Feb-2011") where dateAccountOpened is "Sat Feb 05 00:00:00 GMT+02:00 2011" (if you call toString()). The equal comparator fails (==) but the greater than comparator passes (>) which I don't understand. I feel I am missing something obvious here, but I have no idea what it is. rule "Test date equality" when $acc : SimpleAccount( dateAccountOpened == "5-Feb-2011") then System.out.println("Expected and found an account opened on 5-Feb-2011: " + $acc); end rule "Some dates are more equal than others" when $acc : SimpleAccount( dateAccountOpened > "5-Feb-2011") then System.out.println("Unexpected match: " + $acc.getDateAccountOpened()); end Regards, Karim To read FirstRand Bank's Disclaimer for this email click on the following address or copy into your Internet browser: https://www.fnb.co.za/disclaimer.html If you are unable to access the Disclaimer, send a blank e-mail to firstrandbankdisclaimer(a)fnb.co.za and we will send you a copy of the Disclaimer.

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, 4 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.

12 years, 10 months

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Re: [rules-users] Question about Drools Spring, StatelessKnowledgeSession and globals

by Patrick van Kann

Hello fellow Droolers, A while ago I asked why the <drools:batch> element seemed to work differently in the case of a StatelessKnowledgeSession and a StatefulKnowedgeSession (see below). I just wanted to update those interested with the answer and ask some further questions, probably aimed at any developers who happen to be reading. I checked out the 5.1.1.34858 tag and had a look at how the Spring integration works. I found that the reason that the global is not set in the case of a StatelessKnowledgeSession is because the <spring:batch> element is effectively ignored in the StatelessKnowledgeSessionBeanFactory, which lacks the following code present in the StatefulKnowledgeSessionBeanFactory (in the internalAfterPropertiesSet() method): if ( getBatch() != null && !getBatch().isEmpty()) { for ( Command<?> cmd : getBatch() ) { ksession.execute( cmd ); } } So, either by accident or design the <spring:batch> element has no effect when using a StatelessKnowledgeSession (but is perfectly allowable in the XSD/Spring namespace). So my questions are: 1) Is this the intended behaviour or a bug? On reflection, I am now not sure the idea of a "batch/script" makes sense for a StatelessKnowledgeSession since execute() is a one-shot method and any globals set this way would not be available to later executions, which is what I was looking for. 2) If so, should the XSD be changed to disallow the batch element within a stateless session (difficult, given that this is determined via the "type" attribute) or should the documentation simply warn people that the <spring:batch> element doesn't do anything if you set the type attribute to stateless (somewhat confusing, I suppose) 3) If not, should the code above be added to the StatelessKnowledgeSessionBeanFactory.internalAfterPropertiesSet() method? 4) Should there be another way to declare a global that isn't through the batch element (one that would cause globals to be set via the setGlobal(String, Object) method rather than using the SetGlobalCommand via the execute() method. I am happy to try and contribute something along these lines if I can get some guidance as to what was actually intended. Hope this helps and thanks again for Drools. Patrick ===================================== Hello, I've been trying out the Spring integration package in Drools 5.1.1 and it works really well, but I have run into one issue I can't figure out. I've defined 2 knowledge sessions from the same knowledge base in the app context - one stateless, one stateful but otherwise identical. They both refer to a collaborator defined as a bean in the app context which is to be used as a global in my rules. This is just an excerpt of my full Spring context, the kbase definition itself is not an issue. <bean id="applicantDao" class="com.acme.app.dao.impl.ApplicantDaoImpl" /> <drools:ksession id="statelessKSession" type="stateless" name="statelessKSession" kbase="kbase"> <drools:batch> <drools:set-global identifier="applicantDao" ref="applicantDao" /> </drools:batch> </drools:ksession> <drools:ksession id="statefulKSession" type="stateful" name="statefulKSession" kbase="kbase"> <drools:batch> <drools:set-global identifier="applicantDao" ref="applicantDao" /> </drools:batch> </drools:ksession> The issue is that this configuration works for the stateful but not the stateless session, in the sense that the stateful session appears to have a valid reference to the applicantDao object in the Globals object but the stateless session doesn't. <at> Test public void testStatelessGlobal() { Globals globals = statelessKSession.getGlobals(); Object global = globals.get("applicantDao"); Assert.assertNotNull(global); } <at> Test public void testStatefulGlobal() { Globals globals = statefulKSession.getGlobals(); Object global = globals.get("applicantDao"); Assert.assertNotNull(global); } The first test fails (the global variable is null) but the second passes. No errors are thrown by Drools during the setup of the Spring container. What am I doing wrong? Should I be able to define globals in this way for stateless sessions? The XSD seems to indicate this is a valid configuration, but it just doesn't work. Is anyone else working with the Spring integration that can point out my error here? Many thanks, Patrick

12 years, 10 months

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Drools: Using Declared Types in Decision Tables

by David Smith

Hi, I am trying to use a declared type in a decision table but get an "Unable to resolve ObjectType" message. The declared type is in a file types.drl, I have a spreadsheet test.xls that has a Ruleset with an import line for the declared type. Is it possible to reference a declared type from a decision table? Is it possible to declare a type in a decision table? Thanks David

12 years, 11 months

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Drools Guvnor API information?

by Vikas Hazrati

Hi, I am looking at using Guvnor for our project where users would be creating rules using our UI. For this i need to add / modify rule or any asset for that matter using an api. Unfortunately, i could not find enough documentation to suggest the best way to use the REST api, which I guess is provided by Guvnor. Could someone let me know the location of where i can get some information for this api. I also see that the issue GUVNOR-1080 (https://issues.jboss.org/browse/GUVNOR-1080) is marked resolved so the api should exist right? or that we cannot access it remotely until we have the Atom Pub Interface done? Help appreciated . -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Drools-Guvnor-API-inf... Sent from the Drools - User mailing list archive at Nabble.com.

13 years, 1 month

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enquiry on drools webservice

by Prem Kumar L

13 years, 1 month

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rules-users March 2011