Hi Tina,
It seems that you are using KAgent without incremental change set processing enabled. Thus, the kagent's internal kbase is recreated (re-instantiated) every time a change is detected. So, you must do:

session = kagent.getKnowledgeBase().newStatefulKnowledgeSession();

In order to do this you could add a kagent's event listener to be notified whenever the agent has rebuilt his kbase.

Or, you could use incremental change set:

KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
aconf.setProperty("drools.agent.newInstance", "false");
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("test agent", kbase, aconf); 

Using this feature, the changes are always applied in the current kbase, so there is no need to re-create your session.

For more information: 
http://ilesteban.wordpress.com/2010/03/25/knowledge-agent-incremental-change-set-processing-and-binary-diff/
http://ilesteban.wordpress.com/2010/05/26/knowledge-agent-incremental-change-set-build-implementation/

Best,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


2010/8/18 Tina Vießmann <tviessmann@stud.hs-bremen.de>
Hi,

I've set up a knowledge agent the change set configuration. While running the application I'm changing the rules file and the agent detects the change and rebuidls the knowledge base. But after that the output that should have changed didn't change.

Thank you! :)

Greetings
Tina


Here are the code snippets:

ResourceFactory.getResourceChangeNotifierService().start();
ResourceFactory.getResourceChangeScannerService().start();

KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("AITS CEP Engine Agent");
kagent.applyChangeSet(ResourceFactory.newClassPathResource("changeset.xml"));
       
KnowledgeBase knowledgeBase = kagent.getKnowledgeBase();
       
session = knowledgeBase.newStatefulKnowledgeSession();


<change-set xmlns='http://drools.org/drools-5.0/change-set'
            xmlns:xs='http://www.w3.org/2001/XMSchema-instance'
            xs:schmeaLocation='http://drools.org/drools-5.0/change-setdrools-change-set-5.0.xsd' >

    <add>
        <resource source='classpath:testRule.drl' type='DRL' />
    </add>

</change-set>


The status information put out to the console are:

[2010:08:230 16:08:93:debug] ResourceChangeScanner attempt to scan 1 resources
[2010:08:230 16:08:93:debug] ResourceChangeScanner modified resource=[ClassPathResource path='testRule.drl'] : 1282139449234 : 1282141364812
[2010:08:230 16:08:93:debug] ResourceChangeNotification received ChangeSet notification
[2010:08:230 16:08:93:debug] ResourceChangeScanner thread is waiting for 60 seconds.
[2010:08:230 16:08:93:debug] ResourceChangeNotification processing ChangeSet
[2010:08:230 16:08:93:debug] ResourceChangeNotification ChangeSet modified resource=[ClassPathResource path='testRule.drl'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31
[2010:08:230 16:08:93:debug] KnowledgeAgent received ChangeSet changed notification
[2010:08:230 16:08:93:info] KnowledgeAgent applying ChangeSet
[2010:08:230 16:08:93:debug] KnowledgeAgent rebuilding KnowledgeBase using ChangeSet
[2010:08:230 16:08:109:debug] ResourceChangeNotification thread is waiting for queue update
[2010:08:230 16:08:218:debug] KnowledgeAgent obtaining pkg resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] KnowledgeAgent mapping resource=[ClassPathResource path='testRule.drl'] to KnowledgeDefinition=[Rule name=Insert Watcher Into Knowledge Base, agendaGroup=MAIN, salience=0, no-loop=false]
[2010:08:230 16:08:218:debug] KnowledgeAgent notifier subscribing to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31 to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] KnowledgeAgent mapping resource=[ClassPathResource path='testRule.drl'] to KnowledgeDefinition=[Rule name=Add Event to Watcher Set, agendaGroup=MAIN, salience=0, no-loop=false]
[2010:08:230 16:08:218:debug] KnowledgeAgent notifier subscribing to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31 to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] KnowledgeAgent mapping resource=[ClassPathResource path='testRule.drl'] to KnowledgeDefinition=org.drools.rule.TypeDeclaration@1bed3d1
[2010:08:230 16:08:218:debug] KnowledgeAgent notifier subscribing to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31 to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:218:debug] KnowledgeAgent mapping resource=[ClassPathResource path='testRule.drl'] to KnowledgeDefinition=org.drools.rule.TypeDeclaration@1f528ab
[2010:08:230 16:08:218:debug] KnowledgeAgent notifier subscribing to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:234:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31 to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:234:debug] KnowledgeAgent mapping resource=[ClassPathResource path='testRule.drl'] to KnowledgeDefinition=org.drools.rule.Function@1bb9829
[2010:08:230 16:08:234:debug] KnowledgeAgent notifier subscribing to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:234:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31 to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:234:debug] KnowledgeAgent mapping resource=[ClassPathResource path='testRule.drl'] to KnowledgeDefinition=org.drools.rule.Function@eb840f
[2010:08:230 16:08:234:debug] KnowledgeAgent notifier subscribing to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:234:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1acfa31 to resource=[ClassPathResource path='testRule.drl']
[2010:08:230 16:08:234:debug] KnowledgeAgent adding KnowledgeDefinitionsPackage net.eads.astrium.aits.cep.rules
[2010:08:230 16:08:250:info] KnowledgeAgent new KnowledgeBase now built and in use
[2010:08:230 16:08:250:debug] KnowledgeAgent finished rebuilding KnowledgeBase using ChangeSet

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