4:51 a.m.
(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;
}
}
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5:14 a.m.
Ah. Figured out finally. I should have read the API docs properly.
Apparently, I was using the Iterable overloaded execute method in the
StatelessKnowledgeSession which iterates through all my facts and applies
the rules against it.
However, with StatefulKnowledgeSession, I should be iterating beforehand and
inserting the facts one by one. And then, I could fire the rules.
Just a thought. Any reason why there isn't a insert(Iterable) method in
StatefulKnowledgeSession.
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5:15 a.m.
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(a)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;
}
}
--
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arunodhaya80 -
Wolfgang Laun