[jboss-jira] [JBoss JIRA] (DROOLS-2892) Session reset doesn't clear path memory

[Christian Liebhardt (JIRA)]

Christian Liebhardt created DROOLS-2892:
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             Summary: Session reset doesn't clear path memory
                 Key: DROOLS-2892
                 URL: https://issues.jboss.org/browse/DROOLS-2892
             Project: Drools
          Issue Type: Bug
            Reporter: Christian Liebhardt
            Assignee: Mario Fusco


As discussed in https://groups.google.com/forum/#!topic/drools-usage/V8ypP1o5SwM : 

In order to reduce memory allocations we are calling _StatefulKnowledgeSessionImpl.reset()_ to bring a disposed session back into life. From our understanding this is the same method which the Drools session cache would use. During our tests we found that some of our rules don't trigger if we use this approach. We also found that the reset method leaves _PathMemory _instances behind in the memory. As soon as we cleared the memory explicitly by calling  _session.getNodeMemories().clear()_ after every _session.reset()_ the rules fired again as usual. So we are wondering if the current implementation of _session.reset()_ is incomplete.

We are aware that _session.reset()_ is an internal method. However this issue should also affect the session cache feature of Drools. At the same time it would be nice to have a public interface to _session.reset()_ since in our application reusing a session is beneficial but we don't need the session cache as we can easily remember the last session which we used for processing and it seems more straightforward to just bring that one back to life instead of storing and retrieving it from a cache.



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