[rules-users] Drools Concurrent Execution causes Blocked Threads

[Wolfgang Laun]

On 02/09/2013, lalit2583 <lalit2583 at gmail.com> wrote:
> Hi,
> We are creating different StatefulKnowledge Session for different threads
> all this StatefulKnowledgeSession are created from same KnowledgeBase,
> KnowledgePackage. Is this an issue ?

It should not cause a problem. Synchronisation among user objects
(facts, globals) is user's burden.

> You are correct the API doesnt tells
> if
> StatefuleKnowledgeSession is not thread safe. If I use
> StatelessKnowledgeSession will it resolve the issue ?

Possibly: a Stateless KS is discarded after an execute, so you might appear
to avoid running into whatever caused your problem, but without
removing the cause.

> But as per my knowledge internally StatelessKnowledgeSession uses
> StatefuleKnowledgeSession.

That's what the documentation says.

-W

>
> Regards,
> Lalit.
>
>
>
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