I am trying to use KnowledgeAgent to auto update the knowledgebase when rules
are updated at guvnor. Following is my Test Class that creates the kAgent
and executes the rules every 3 Seconds.
/
import org.drools.KnowledgeBase;
import org.drools.agent.KnowledgeAgent;
import org.drools.agent.KnowledgeAgentConfiguration;
import org.drools.agent.KnowledgeAgentFactory;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
public class MainClass {
public static void main(String[] st) throws Exception {
KnowledgeAgentConfiguration aconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
aconf.setProperty("drools.agent.newInstance", "true");
final KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent("kagent", aconf);
ResourceFactory.getResourceChangeNotifierService().start();
ResourceFactory.getResourceChangeScannerService().start();
kagent.applyChangeSet(ResourceFactory.newClassPathResource("ChangeSet.xml"));
KnowledgeBase kbase = kagent.getKnowledgeBase();
while (true) {
try {
Thread.sleep(3000);
kbase = kagent.getKnowledgeBase();
System.out.println("Number of packages(should
be 1): " +
kbase.getKnowledgePackages().size());
StatefulKnowledgeSession session =
kbase.newStatefulKnowledgeSession();
session.insert("");
System.out.println("Number of rules fired: " +
session.fireAllRules());
session.dispose();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
/
And following is my ChangeSet.xml
/
<change-set xmlns='http://drools.org/drools-5.0/change-set'
xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'
>
<add>
<resource basicAuthentication="enabled" username="admin"
password="admin" type="DRL"
source="http://localhost:8080/brms/rest/packages/ReceiverConfigurationRules/source";></resource>
</add>
</change-set>
/
And I have one rules package "ReceiverConfigurationRules" and simple drl
rule with no condition( so will always fire).
So, when I run my program, for few times, it works as expected printing
number of packages and number of rule fired as "1". However as soon as
"DebugKnowledgeAgentEventListener" logs the following into the console, It
starts printing number of packages with kBase as "0" and number of rules
fired as "0". This is unexpected behavior. Is this a bug or am I missing
something important?
==>[BeforeChangeSetAppliedEvent: org.drools.io.impl.ChangeSetImpl@34f2e383]
==>[BeforeChangeSetProcessedEvent:
org.drools.io.impl.ChangeSetImpl@34f2e383]
==>[BeforeResourceProcessedEvent(RESOURCE_MODIFIED): [UrlResource
path='http://localhost:8080/brms/rest/packages/ReceiverConfigurationRules/source']]
==>[AfterResourceProcessedEvent(RESOURCE_MODIFIED): [UrlResource
path='http://localhost:8080/brms/rest/packages/ReceiverConfigurationRules/source']]
==>[AfterChangeSetProcessedEvent: org.drools.io.impl.ChangeSetImpl@34f2e383]
==>[KnowledgeBaseUpdatedEvent: org.drools.impl.KnowledgeBaseImpl@3fd7ada9]
==>[AfterChangeSetAppliedEvent: org.drools.io.impl.ChangeSetImpl@34f2e383]
Weird thing is when I use local resource like
source="file:\\\configRules.drl", everything is works perfect. Have anyone
experienced such issue? I used drools 5.4.final core as well as 5.3 but same
issue. I appreciate your help in advance.
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