[rules-users] Drools with Guvnor

[Esteban Aliverti]

Well, actually KnowledgeAgent can't modify the rules. It can modify its
internal kbase using the change-sets shown by jervis, but the rule sources
are never modified by the agent.
Basically you can start an agent with some initial change-set and all the
rules present in the change-set resources are added to the agent's kbase.
Once the agent is running you can add more resources using similar
change-sets. You can even modify (remove, update) the rules inside the
agent's kbase using change-sets too. Using ResourceScanner and Notifier, the
agent is able to automatically detect changes on monitored resources and
reflect the changes in its internal kbase. But as I said, the resources are
never modified by the agent.

Hope I was clear.

Best,

On Thu, May 20, 2010 at 3:43 AM, Jervisliu <jliu at redhat.com> wrote:

> With the new KnowledgeAgent API, you can not only connect to Guvnor
> server remotely to store and retrieve rules, but also to add or update
> rules. It also has basic authentication supported. Take a look at the
> unit test:
>
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/agent/KnowledgeAgentTest.java
>
> Below is a very simple test case that connects to Guvnor to retrieve a
> rule package, build a KnowledgeSession, then fire rules:
>
>    public void testBasicAuthentication() throws Exception {
>        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-set
> drools-change-set-5.0.xsd' >";
>        xml += "    <add> ";
>        xml += "        <resource
> source='
> http://localhost:8081/drools-guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST
> '
> type='PKG'  basicAuthentication='enabled' username='admin'
> password='admin'/>";
>        xml += "    </add> ";
>        xml += "</change-set>";
>        File fxml = fileManager.newFile("changeset.xml");
>        Writer 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);
>
>        kagent.applyChangeSet(ResourceFactory.newUrlResource(fxml.toURI()
>                .toURL()));
>
>        StatefulKnowledgeSession ksession = kagent.getKnowledgeBase()
>                .newStatefulKnowledgeSession();
>        List<String> list = new ArrayList<String>();
>        ksession.setGlobal("list", list);
>        ksession.fireAllRules();
>        ksession.dispose();
>
>        assertEquals(2, list.size());
>        assertTrue(list.contains("rule1"));
>        assertTrue(list.contains("rule2"));
>    }
>
> Hope this helps,
>
> Jervis
>
> Michael Rhoden wrote:
> > Yes and no. Guvnor uses a JCR repository (the default is
> > http://jackrabbit.apache.org/) which can not be accessed using
> > hibernate directly. We ran into this issue, and the only way to use
> > guvnor as of 6 months ago was to have a user go into guvnor and create
> > a DRL file by clicking a few buttons. Not a big deal, but it isn't
> > automated. You can then use that DRL as a resource in your
> > application. I know there was some working being done to be able to
> > pull out DRLs from Guvnor using xml calls, but don't know if that was
> > ever completed.
> >
> > Michael Rhoden
> >
> >
> > ----- Original Message -----
> > From: "bbarani" <bbarani at gmail.com>
> > To: rules-users at lists.jboss.org
> > Sent: Wednesday, May 19, 2010 5:12:57 PM
> > Subject: [rules-users] Drools with Guvnor
> >
> >
> > Hi,
> >
> > I am very new to Drools and very very new to Guvnor.
> >
> > I am in the process of creating a rule engine which will fetch the
> > data from
> > a source (I am using Hibernate framework to fetch the data) and
> > evaluate the
> > data using Drools rule engine. The rules supplied to the Drools rule
> > engine
> > are stored in a Rules table in a database.
> >
> > Now my question is that can I use Guvnor to store the rules (instead of
> me
> > creating a rule data model) and use Guvnor to supply rules to my Drools
> > engine?
> >
> > I am trying to find out the best possible way to create / manage a rule
> > database (which stores all the rules).
> >
> > Thanks,
> > BB
> > --
> > View this message in context:
> >
> http://drools-java-rules-engine.46999.n3.nabble.com/Drools-with-Guvnor-tp830453p830453.html
> > Sent from the Drools - User mailing list archive at Nabble.com.
> > _______________________________________________
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> > https://lists.jboss.org/mailman/listinfo/rules-users
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>
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-- 
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Esteban Aliverti
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