[rules-users] Questions about using Knowledge Agent

[Esteban Aliverti]

Please note that the following line in the example will configure the
ResourceScanner to scan all the resources every 2 second! I don't think this
is what you want!

*sconf.setProperty("drools.resource.scanner.interval", "2");*



On Tue, May 11, 2010 at 1:25 PM, Esteban Aliverti <
esteban.aliverti at gmail.com> wrote:

> Hi John,
> Knowledge Agent is indeed the replacement of RuleAgent. It maintains a
> kbase and update it using change sets. A change set is an xml that list all
> the resources that the agent should take care of. In conjunction with
> ResouceChangeNotifier and ResourceChangeScanner you can use a knowledge
> agent to use packages exposed using guvnor.
> Basically, the scanner will scan periodically a resource and find
> modifications. Whenever the resource changed, the scanner creates a change
> set and uses the Notifier to let the kagent know about the change.
> The thing is that you need to setup an initial change set, so the agent can
> start working. Here is one way to do that:
>
>                 //Scanner and notifier work as services. They must be
> started though
>                 ResourceFactory.getResourceChangeNotifierService().start();
>                 ResourceFactory.getResourceChangeScannerService().start();
>
>                 String xml = "";
>  xml += "<change-set xmlns='http://drools.org/drools-5.0/change-set'";
>  xml += "    xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'";
> xml += "    xs:schemaLocation='http://drools.org/drools-5.0/change-setdrools-change-set-5.0.xsd' >";
>  xml += "    <add> ";
> xml += "        <resource source='http://localhost:9000/rule1.drl'
> type='DRL' />";
>  xml += "        <resource source='http://localhost:9000/rule2.drl'
> type='DRL' />";
>  xml += "    </add> ";
> xml += "</change-set>";
>  File fxml = fileManager.newFile("changeset.xml");
> output = new BufferedWriter(new FileWriter(fxml));
>  output.write(xml);
> output.close();
>
> KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
>
> ResourceChangeScannerConfiguration sconf = ResourceFactory
> .getResourceChangeScannerService()
>  .newResourceChangeScannerConfiguration();
> sconf.setProperty("drools.resource.scanner.interval", "2");
>  ResourceFactory.getResourceChangeScannerService().configure(sconf);
>
> KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory
>  .newKnowledgeAgentConfiguration();
> aconf.setProperty("drools.agent.scanDirectories", "true");
>  aconf.setProperty("drools.agent.scanResources", "true");
> aconf.setProperty("drools.agent.newInstance", "true");
>  KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent(
> "test agent", kbase, aconf);
>
> assertEquals("test agent", kagent.getName());
>
> kagent.applyChangeSet(ResourceFactory.newUrlResource(fxml.toURI()
>  .toURL()));
>
> StatefulKnowledgeSession ksession = kagent.getKnowledgeBase()
>  .newStatefulKnowledgeSession();
>
>
> I took this code from kagent's test cases.
> You can also create a new ChangeSetImpl by hand instead of use an xml file.
>
> I hope you find this helpful.
> If you have any other question, or you have doubts about this, feel free to
> ask!
>
> Best,
>
> 2010/5/11 John Peterson <john.peterson.gv3k at statefarm.com>
>
>>  Hi all,
>>
>> I’m trying to get the sample code in the Drools 5.0.1 User Manual to work
>> locally for a Knowledge Agent, but I’m missing some info (from my
>> perspective) to get it to run.
>>
>> Question #1:
>>
>> From the User Manual (3.2.6):
>>
>> KnowledgeAgent kagent =
>>
>>           KnowledgeAgentFactory.newKnowledgeAgent( "MyAgent" );
>>
>> kagent.applyChangeSet( ResourceFactory.newUrlResource( url ) );
>>
>> KnowledgeBase kbase = kagent.getKnowledgeBase();
>>
>> In the third line, what is “url” and how is it defined in the java code?
>> I don’t know what to set up here to make it work.  I’ve found this same code
>> on multiple sites, but no answer to the question.
>>
>> Question #2:
>>
>> How do I set up a Change Set XML file?  I see the XML, but I don’t know
>> where to put the file and how to link it into the code.
>>
>> Question #3:
>>
>> Does KnowledgeAgent replace RuleAgent for invoking Guvnor-deployed packages
>> in 5.0.1?  If so, how do you specify the url of the deployed package from
>> Guvnor?
>>
>> Sorry if my questions are ignorant.  I’ve been trying to find these
>> answers for several days and hit the point where I needed to get some
>> help.
>>
>> Thanks,
>>
>> John
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>



-- 
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Esteban Aliverti
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