[rules-users] KnowledgeAgent with persistence?

[dunnlow]

I'm using Drools 5.5 (and guvnor)

Can anyone point me to example where a knowledge agent is used with
persistence.  I am trying to understand how the knowledgeagent is used with
a persisted session.  Fundamentally when my app starts, I am trying to do
one of two things:

If a persisted session does not exist, start a new one and update it
whenever my knowledgebase (in guvnor) changes
ELSE
If a persisted session already exists (i.e. at a system restart), load the
existing session and continue to monitor it for changes.

I have the persistence working and the monitoring of changes (with a
knowledgeagent) working independently, but not together.

My code:

   Environment env = KnowledgeBaseFactory.newEnvironment();
   env.set(EnvironmentName.ENTITY_MANAGER_FACTORY,myEMF);
   env.set(EnvironmentName.TRANSACTION_MANAGER, myTxManager);

To create/retrieve my ksession I have tried both:
   ksession =
JPAKnowledgeService.newStatefulKnowledgeSession(kAgent.getKnowledgeBase(),null,env)
This creates a persisted session, but it is never updated with changes

I also tried:
   ksession =
kAgent.getKnowledgeBase().newStatefulKnowledgeSession(null,env);
This updates the ksession with changes, but never persists the session

I figure I can add a KnowledgeAgentEventListener to the agent and then
recreate the ksession by hand (in the knowledgeBaseUpdated method).  But I
am hoping there is a cleaner/better way.

Thanks for any ideas.
-J




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