[rules-users] Automatic updating of Guvnor Rules appears to be not working.
Esteban Aliverti
esteban.aliverti at gmail.com
Fri Jun 25 08:09:50 EDT 2010
I guess you are trying to use the same session you had after the
modifications are applied. And unfortunately you can't do that using 5.0.1
:(. Since 5.1.M1 you can use the "incremental change set processing" feature
that allows you to do what you are looking for. Without this feature, kagent
creates a new Knowledge Base every time a change set is processed. So if you
want to "see" the changes you will need to do something like this:
knowledgeAgent.getKnowledgeBase().newStateful/StatelessKnowledgeSession();
and then insert all your facts again :(
If you try to use the original kbase, you won't see the changes applied by
the agent.
Using incremental change set processing the agent's kbase is reused,
allowing you (among other things) to reuse any previous session you have.
Best,
On Fri, Jun 25, 2010 at 4:48 AM, Stephen Mcgruer <s0840449 at sms.ed.ac.uk>wrote:
> Unfortunately that might be quite tricky, although I can try if
> necessary. I do think that perhaps the problem lies in the way I
> handle the auto-updating, I think I'm doing it wrong. Originally I
> just created the knowledge base and knowledge agent like so, and
> started the ResourceChange Notifier and Scanner services:
>
> //construct a knowledgebase that uses Equality mode assert behaviour
> so that it can match beans properly
> KnowledgeBaseConfiguration knowledgeBaseConfig =
> KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
> knowledgeBaseConfig.setProperty("drools.assertBehaviour", "equality");
> knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase(knowledgeBaseConfig);
>
> //create a new knowledgeAgent to track changes
> knowledgeAgent = KnowledgeAgentFactory.newKnowledgeAgent(
> "knowledgeAgent", knowledgeBase );
> knowledgeAgent.applyChangeSet( ResourceFactory.newClassPathResource(
> "changeSet.xml" ) );
> knowledgeBase = knowledgeAgent.getKnowledgeBase();
>
> ResourceFactory.getResourceChangeNotifierService().start();
> ResourceFactory.getResourceChangeScannerService().start();
>
>
> This seemed to claim to update the knowledge base, but nothing changed
> as I mentioned before. At the moment, I'm trying rebuilding the
> knowledgebase when I detect a change, but this involves re-inserting
> the entire database which could be big eventuallly... And it doesn't
> even work entirely correctly either XD.
>
> What are the correct steps to take to keep a knowledgeBase
> auto-updating, and do you have to re-create it each time?
>
> Thanks,
> Stephen
>
>
> Quoting Esteban Aliverti <esteban.aliverti at gmail.com>:
>
> > Could you please try your example using latest SNAPSHOT or 5.1M2?
> >
> > Thanks
> >
> > On Thu, Jun 24, 2010 at 10:20 AM, Stephen Mcgruer
> > <s0840449 at sms.ed.ac.uk>wrote:
> >
> >> Sorry, I'm using Drools 5.0.1
> >>
> >> Cheers,
> >> Stephen
> >>
> >> Quoting Esteban Aliverti <esteban.aliverti at gmail.com>:
> >>
> >> > Which version of drools are you using?
> >> >
> >> > On Thu, Jun 24, 2010 at 5:33 AM, Stephen Mcgruer
> >> > <s0840449 at sms.ed.ac.uk>wrote:
> >> >
> >> >> Hi there. I'm trying to get automatic update of rules working in my
> >> >> project, and seem to
> >> >> have run into a problem. As far as I can tell, automatic polling and
> >> >> updating is turned
> >> >> on, and claims to update the knowledgebase, but changes to the rules
> >> >> don't seem to have
> >> >> any effect. A simple example - if I add the rule:
> >> >>
> >> >> rule "TestRule"
> >> >> dialect "mvel"
> >> >> when
> >> >> then
> >> >> System.out.println("Hello, world!");
> >> >> end
> >> >>
> >> >> And start my application, I get:
> >> >>
> >> >> Firing all rules...
> >> >> Hello, world!
> >> >> All rules fired.
> >> >>
> >> >> As expected. If I then change the rule as follows:
> >> >>
> >> >> rule "TestRule"
> >> >> dialect "mvel"
> >> >> when
> >> >> then
> >> >> System.out.println("I have changed!");
> >> >> end
> >> >>
> >> >> I get this output (timestamps trimmed for readability):
> >> >>
> >> >> ResourceChangeScanner attempt to scan 1 resources
> >> >> ResourceChangeScanner modified resource=[UrlResource
> >> >> path='
> >> >>
> >>
> http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/ERMIE/v0.1
> >> >> ']
> >> >> :
> >> >> 1277371031000 : 1277371254000
> >> >> ResourceChangeNotification received ChangeSet notification
> >> >> ResourceChangeScanner thread is waiting for 60
> >> >> ResourceChangeNotification processing ChangeSet
> >> >> ResourceChangeNotification ChangeSet modified resource=[UrlResource
> >> >> path='
> >> >>
> >>
> http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/ERMIE/v0.1
> >> >> ']
> >> >> for listener=org.drools.agent.impl.KnowledgeAgentImpl at e2d0b2
> >> >> KnowledgeAgent received ChangeSet changed notification
> >> >> ResourceChangeNotification thread is waiting for queue update
> >> >> KnowledgAgent applying ChangeSet
> >> >> KnowledgeAgent ChangeSet requires KnowledgeBuilderKnowledgeAgent
> >> >> rebuilding KnowledgeBase
> >> >> using ChangeSet
> >> >> KnowledgeAgent building resource=[UrlResource
> >> >> path='
> >> >>
> >>
> http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/ERMIE/v0.1
> >> >> ']
> >> >> KnowledgeAgent adding KnowledgeDefinitionsPackage ERMIE
> >> >> KnowledgeAgent new KnowledgeBase now built and in use
> >> >>
> >> >> So, this makes it seem like everything has worked. However, if I
> >> >> insert a new fact and
> >> >> fire all rules...
> >> >>
> >> >> Inserting new fact...
> >> >> Hello, World!
> >> >>
> >> >> So, it hasn't worked. What might I have done wrong?
> >> >>
> >> >>
> >> >> -Stephen
> >> >>
> >> >> --
> >> >> The University of Edinburgh is a charitable body, registered in
> >> >> Scotland, with registration number SC005336.
> >> >>
> >> >>
> >> >>
> >> >> _______________________________________________
> >> >> rules-users mailing list
> >> >> rules-users at lists.jboss.org
> >> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> >> >
> >> > Esteban Aliverti
> >> >
> >>
> >>
> >>
> >> --
> >> The University of Edinburgh is a charitable body, registered in
> >> Scotland, with registration number SC005336.
> >>
> >>
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> >
> >
> > --
> > XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> >
> > Esteban Aliverti
> >
>
>
>
> --
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20100625/016ef82a/attachment.html
More information about the rules-users
mailing list