[rules-users] Drools rules not getting fired

[Wolfgang Laun]

Note that StatelessKnowledgeSession.execute(x) is not the same as
StatefulKnowledgeSession.insert(x) + fireAllRules() + dispose() with
respect to what x may be and how x appears in the Working Memory.
execute() "unravels" a Container (actually: Iterable) and inserts each
object returned from the Iterator. insert(), however, inserts the
object "as is". You'll have to do the implied iteration yourself.

-W



On 03/09/2012, arunodhaya80 <arun at arunma.com> wrote:
> (Sorry about the repost. Was rejected earlier from the mailing list for
> lack
> of subscription)
>
> I am pretty new to Drools and am probably doing something really silly. The
> problem is that for some reason my Drools rules are not getting fired.
>
> If it helps, the rules fire when I shift back to a
> StatelessKnowledgeSession
> and use the execute method to fire the rules. However, I need to use
> AgendaFilter to filter rules and I understand that agenda filters aren't
> supported on StatelessKnowledgeSession yet. As a first step, I just flipped
> the session to a StatefulKnowledgeSession, inserted the facts and fired all
> the rules.
>
> Had to humbly say that I was breaking my head for the past couple of days
> on
> this. Too bad, the documentation isn't that friendly for drools (I refer to
> the official documentation and the user guide.
>
> The Rule Validator code and the Spring factory bean with which I load the
> Knowledge from the rule file is quoted below. I, personally, don't see any
> issues with the FactoryBean. Any pointers would be of great help.
>
> RuleValidator.java
>
> StatefulKnowledgeSession ksession =
> knowledgeBase.newStatefulKnowledgeSession();
> ksession.setGlobal("validationReport", validationReport);
> ksession.setGlobal("simpleCache", simpleCache);
> ksession.setGlobal("ruleValidator", this);
>
> ksession.insert(allClientDetails); //this is a list of ClientDetails
> objects
> (facts)
> ksession.fireAllRules();
> ksession.dispose();
>
> return validationReport;
>
>
> KnowledgeBaseFactory.java
>
> import java.io.IOException;
> import java.util.Map;
>
> import org.apache.log4j.Logger;
> import org.drools.KnowledgeBase;
> import org.drools.builder.KnowledgeBuilder;
> import org.drools.builder.KnowledgeBuilderFactory;
> import org.drools.builder.ResourceType;
> import org.drools.io.Resource;
> import org.drools.io.ResourceFactory;
> import org.springframework.beans.factory.FactoryBean;
>
>
> public class KnowledgeBaseFactory implements FactoryBean<KnowledgeBase> {
>
>     private static Logger
> logger=Logger.getLogger(KnowledgeBaseFactory.class);
>
>     private KnowledgeBase knowledgeBase;
>
>     public KnowledgeBaseFactory(Map<String,ResourceType> resourceMap)
> throws
> IOException {
>         logger.debug("Resource Map : "+resourceMap);
>         final KnowledgeBuilder knowledgeBuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>         for (Map.Entry<String, ResourceType>
> eachRuleResource:resourceMap.entrySet()){
>
> knowledgeBuilder.add(ResourceFactory.newClassPathResource(eachRuleResource.getKey()),eachRuleResource.getValue());
>
>         }
>
>         if (knowledgeBuilder.hasErrors()){
>             logger.error(knowledgeBuilder.getErrors().toString());
>             throw new
> RuntimeException(knowledgeBuilder.getErrors().toString());
>         }
>         knowledgeBase = knowledgeBuilder.newKnowledgeBase();
>
> knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages());
>     }
>
>     @Override
>     public KnowledgeBase getObject() throws Exception {
>         return knowledgeBase;
>     }
>
>     @Override
>     public Class<?> getObjectType() {
>         return knowledgeBase.getClass();
>     }
>
>     @Override
>     public boolean isSingleton() {
>         return true;
>     }
> }
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Drools-rules-not-getting-fired-tp4019526.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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