9:50 a.m.
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-cha...
http://ilesteban.wordpress.com/2010/05/26/knowledge-agent-incremental-cha...
Best,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com
2010/8/18 Tina Vießmann <tviessmann(a)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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