On 8/26/09, rules-users-request@lists.jboss.org <rules-users-request@lists.jboss.org> wrote:
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Today's Topics:
1. Rule for Collection (Ashish Soni)
2. Using KnowledgeAgent with Stateful session (nestabur)
3. Re: Cannot view Process Definitions in gwt-console (rbms)
4. Re: Using KnowledgeAgent with Stateful session (James Owen)
----------------------------------------------------------------------
Message: 1
Date: Wed, 26 Aug 2009 12:22:55 -0400
From: Ashish Soni <learnspring@gmail.com>
Subject: [rules-users] Rule for Collection
To: Rules Users List <rules-users@lists.jboss.org>
Message-ID:
<cf7a8a020908260922je3d0f9cie85eada146f594e9@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi All ,
Can someone please help how can i write a rule for below condition -
I have Student object which contains List of Courses
public Class Person
{
private List<Course> courseList;
}
public Class Course
{
private String name;
private int duration;
}
Now lets say the list of course inside person object contains 10 course
objects and if one of the course object contain name =="XYZ" and another
contain a duration = 20 hours then how i can write a rule for this.
Thanks.
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Message: 2
Date: Wed, 26 Aug 2009 09:34:33 -0700 (PDT)
From: nestabur <nestabur@gmail.com>
Subject: [rules-users] Using KnowledgeAgent with Stateful session
To: rules-users@lists.jboss.org
Message-ID: <25151447.post@talk.nabble.com>
Content-Type: text/plain; charset=us-ascii
Does anyone tried to use the knowledgeAgent with statefulSessions?
I've tried to configure my rule engine obtaining unexpected behaviour.
I configure my statefulSession as follows:
wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent
.getKnowledgeBase()).ruleBase.newStatefulSession(
(SessionConfiguration) sessionConf, env);
ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
And after updating the KnowledgeBase in the agent I update my ksession:
wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent
.getKnowledgeBase()).ruleBase);
ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
Without using entry-points this approach works as expected, but using them
it fails after the first update throwing the error:
Exception while processing message: java.lang.NullPointerException
java.lang.NullPointerException
at
org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:54)
at
org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:79)
at
org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:66)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)
Browsing the drools core code I found the line that was throwing the
exception and tried to get the same result by implementing:
if (!((InternalRuleBase) ((KnowledgeBaseImpl)
ksession.getKnowledgeBase()).ruleBase)
.getTypeDeclaration(fact.getClass()) == null)
log.info (((InternalRuleBase) ((KnowledgeBaseImpl)
ksession.getKnowledgeBase()).ruleBase)
.getTypeDeclaration(fact.getClass()).getTimestampExtractor().toString());
after updating my ksession. The result was the same, again the same
exception thrown but my logger wrote:
18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact
field=myTimestampField]
So I dont know why the core is throwing that exception, is that
implementation correct?, any ideas?
Thanks,
Nestor
--
View this message in context: http://www.nabble.com/Using-KnowledgeAgent-with-Stateful-session-tp25151447p25151447.html
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------------------------------
Message: 3
Date: Wed, 26 Aug 2009 11:37:55 -0700 (PDT)
From: rbms <rbms@hotmail.com>
Subject: Re: [rules-users] Cannot view Process Definitions in
gwt-console
To: rules-users@lists.jboss.org
Message-ID: <25152800.post@talk.nabble.com>
Content-Type: text/plain; charset=us-ascii
Thanks for the reply Kris,
I finally found the issue. When file is uploaded from guvnor, looks like the
compile package bytes property is not set in the repo.
So I had to invoke rebuildPackages function from
org.drools.guvnor.server.ServiceImplementation.loadRuleAsset function
thanks
-Ramesh
Kris Verlaenen wrote:
>
> Because the gwt-console does not allow you to specify which knowledge
> package should be loaded (yet), it currently uses the "default" package.
> Putting your rule flow in a package called "default" (and then building
> that package in Guvnor) should solve your issue I think. You could also
> change the name of the package to load in the changeset.xml file in
> drools-gwt-console.
>
> Kris
>
> Quoting rbms <rbms@hotmail.com>:
>
>>
>> I am trying to deploy drools-guvnor, gwt-console in Tomcat.
>> I am using mysql for persistence.
>> I uploaded the process definitions in drools-guvnor.(I can see them
>> Packages
>> --> defaultPackage --> RuleFlows)
>> However when I try to view them in Processes --> Process Definitions
>> -->
>> Definition List, I cannot see them.
>>
>> Following is from tomcat server log.(with debugging statements that
>> I
>> added.)
>>
>> I placed debug statements in
>> org.drools.guvnor.server.files.PackageDeploymentServlet.doGet method.
>> This
>> method calls
>> org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage
>> method.
>>
>> //Following is the debug statement that I placed in
>> org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage
>> method.
>> public String loadBinaryPackage(String packageName,
>> String packageVersion,
>> boolean isLatest,
>> OutputStream out) throws
>> IOException {
>> PackageItem item = null;
>> if ( isLatest ) {
>> item = repository.loadPackage( packageName );
>> System.out.println("FileManagerUtils.loadBinaryPackage() ...");
>> AssetItemIterator ai = item.queryAssets("drools:format='rf'",
>> false);
>> for (;ai.hasNext();) {
>> Object o = ai.next();
>> System.out.println("FileManagerUtils.loadBinaryPackage item = "
>> +
>> o.getClass() +":"+o);
>>
>>
> System.out.println("*************************************************************************");
>> }
>>
>> As you can see the servlet returns the rule flow.
>>
>> I also placed some debug statements in
>> org.drools.rule.Package.readExternal
>> method. As you can see when it comes to this method rule flow is
>> empty.
>>
>> Because of this
>> org.drools.integration.console.DroolsFlowCommandDelegate.getProcesses()
>> function returns 0 process definitions.
>>
>> Can somebody help?
>>
>> ********************************************************
>> [2009:08:231 22:08:625:debug] KnowledgeAgent rebuilding KnowledgeBase
>> using
>> ChangeSet
>> [2009:08:231 22:08:625:debug] KnowledgeAgent building
>> resource=[UrlResource
>>
> path='http://localhost:8081/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST']
>> PackageName: defaultPackage
>> //org.drools.guvnor.server.files.PackageDeploymentServlet.doGet -
>> Begin
>> PackageVersion: LATEST
>> PackageIsLatest: true
>> PackageIsSource: false
>> requestURI:
>> /drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST
>> test:
>> /drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST
>> //org.drools.guvnor.server.files.PackageDeploymentServlet.doGet -
>> End
>> FileManagerUtils.loadBinaryPackage() ... //
>> org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage -
>> Begin
>> FileManagerUtils.loadBinaryPackage item = class
>> org.drools.repository.AssetItem:Content of rule item named 'testRF':
>> Content: <?xml version="1.0" encoding="UTF-8"?>
>> <process xmlns="http://drools.org/drools-5.0/process"
>> xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
>> xs:schemaLocation="http://drools.org/drools-5.0/process
>> drools-processes-5.0.xsd"
>> type="RuleFlow" name="ProjectApprovalProcess"
>> id="ProjectApprovalProcess" package-name="defaultPackage" >
>>
>> <header>
>> <variables>
>> <variable name="project" >
>> <type
>> name="org.drools.process.core.datatype.impl.type.ObjectDataType"
>> className="com.yesVin.workflow.project.Project" />
>> </variable>
>> <variable name="status" >
>> <type
>> name="org.drools.process.core.datatype.impl.type.StringDataType" />
>> </variable>
>> </variables>
>> </header>
>>
>> <nodes>
>> <start id="1" name="Start" x="15" y="11" width="80" height="40"
>> />
>> <end id="2" name="End" x="206" y="442" width="80" height="40" />
>> <humanTask id="3" name="Review Project" x="126" y="12"
>> width="80"
>> height="40" >
>> ..
>> ...
>> .....
>> ......
>> //org.drools.guvnor.server.files.FileManagerUtils.loadBinaryPackage
>> -
>> End
>> Package.readExternal isDroolsStream = true //
>> org.drools.rule.Package.readExternal - Begin
>> Package.readExternal pkg = null
>> dialectRuntimeRegistry =
>> org.drools.rule.DialectRuntimeRegistry@198046
>> name = defaultPackage
>> imports =
>> {defaultPackage.*=org.drools.rule.ImportDeclaration@d75e0360}
>> staticImports = []
>> functions = {}
>> factTemplates = {}
>> ruleFlows = {}
>> globals = {}
>> valid = true
>> rules = {}
>> classFieldAccessorStore =
>> org.drools.base.ClassFieldAccessorStore@34b350
>> //org.drools.rule.Package.readExternal - End
>> --
>> View this message in context:
>>
> http://www.nabble.com/Cannot-view-Process-Definitions-in-gwt-console-tp25056005p25056005.html
>> Sent from the drools - user mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users@lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
>
> Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
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------------------------------
Message: 4
Date: Wed, 26 Aug 2009 16:31:04 -0500
From: James Owen <jco2009@att.net>
Subject: Re: [rules-users] Using KnowledgeAgent with Stateful session
To: Rules Users List <rules-users@lists.jboss.org>
Message-ID: <7DCB55B5-8A89-481A-BCDC-77E4A2C5F0B6@att.net>
Content-Type: text/plain; charset="us-ascii"
Greetings:
Nobody seems to be replying and I'm not really "qualified" to reply
but I might be able to point you in the right direction. Long, long
ago in a land far, far away we did a really cool project using
Intelligent Agents and employed most of the technology from FIPA, The
Foundation for Intelligent Physical Agents; see http://www.fipa.org/
for more information.
SDG
James Owen
Founder October Rules Fest
Senior Consultant / Architect KBSC
http://www.kbsc.com
http://www.OctoberRulesFest.org
Twitter: OctRulesFest
Blogs:
http://JavaRules.blogspot.com [Rulebased Systems Blog]
http://ORF2009.blogspot.com [October Rules Fest Blog]
http://exscg.blogspot.com/ [Expert Systems Consulting Group Blog]
"If I have seen a little further it is by standing on the shoulders of
giants."
Sir Isaac Newton in a letter to Robert Hooke, 5 Feb 1676
Come to October Rules Fest and stand on the shoulders of the Giants of
the industry; if only for a week.
On Aug 26, 2009, at 11:34 AM, nestabur wrote:
>
>
> Does anyone tried to use the knowledgeAgent with statefulSessions?
>
> I've tried to configure my rule engine obtaining unexpected behaviour.
>
> I configure my statefulSession as follows:
>
> wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent
> .getKnowledgeBase()).ruleBase.newStatefulSession(
> (SessionConfiguration) sessionConf, env);
> ksession = new StatefulKnowledgeSessionImpl(wm,
> kagent.getKnowledgeBase());
>
> And after updating the KnowledgeBase in the agent I update my
> ksession:
>
> wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent
> .getKnowledgeBase()).ruleBase);
> ksession = new StatefulKnowledgeSessionImpl(wm,
> kagent.getKnowledgeBase());
>
> Without using entry-points this approach works as expected, but
> using them
> it fails after the first update throwing the error:
>
> Exception while processing message: java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org
> .drools
> .reteoo
> .ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:
> 54)
> at
> org
> .drools
> .common
> .AbstractFactHandleFactory
> .newFactHandle(AbstractFactHandleFactory.java:79)
> at
> org
> .drools
> .common
> .AbstractFactHandleFactory
> .newFactHandle(AbstractFactHandleFactory.java:66)
> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109)
> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)
> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)
>
> Browsing the drools core code I found the line that was throwing the
> exception and tried to get the same result by implementing:
>
> if (!((InternalRuleBase) ((KnowledgeBaseImpl)
> ksession.getKnowledgeBase()).ruleBase)
> .getTypeDeclaration(fact.getClass()) == null)
> log.info (((InternalRuleBase) ((KnowledgeBaseImpl)
> ksession.getKnowledgeBase()).ruleBase)
>
> .getTypeDeclaration
> (fact.getClass()).getTimestampExtractor().toString());
>
> after updating my ksession. The result was the same, again the same
> exception thrown but my logger wrote:
> 18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact
> field=myTimestampField]
>
> So I dont know why the core is throwing that exception, is that
> implementation correct?, any ideas?
>
>
> Thanks,
>
> Nestor
>
> --
> View this message in context: http://www.nabble.com/Using-KnowledgeAgent-with-Stateful-session-tp25151447p25151447.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
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