Hi,
We are using Drools Expert, Fusion, Flow, etc... to build a complex event processing system and one of our main constraints is to be fault tolerant. As such, we are using an StatefulKnowledgeSession and our system involves processes, sets of rules, events, accumulators, ... . What we need is to be able to reconstruct a KnowledgeSession in a given state and all our changes in the knowledgesession need to be persisted at the very moment a change is detected.
The documentation is sparse in this point (
http://docs.jboss.org/drools/release/5.4.0.Beta2/drools-expert-docs/html/ch04.html#d0e2702 ) and what we've seen so far is that our rules are persisted but no traces of facts or events ... This would be unaceptable for our product. We need to be able to stop our service at any time and restore the knowledge session at any time as it was at the moment of the previous stop.
We have previous experience with JBPM 3 using a persistent storage to be fault tolerant and it works like a charm, we can see our processes, process instances, timers, etc... .
Can we get a *full* KnowledgeSession persistence service for Drools?
Greets,