[rules-users] Task Handler blocking

[Alberto R. Galdo]

Hi All,

   We have an application where we are using JBPM for our processes. In our
application there's a strong requirement to maintain the same
KnowledgeSession between restarts even though that we are not using rules
at all, just BPMN 2.0 processes ( we are aware that JBPM needs it to
maintain process state, workitem state and so on ...  but don't need
neither rules nor ReteOO loops in our app ).

   Now we got to the tricky task handling part, were we have several
handlers that depend on I/O which blocks the entire execution of the
processes. And just because all our application depends on the *same*
shared stored knowledge session, all our other parallel processes that need
to execute processes are waiting ( like in a queue ) for the I/O to finish
and execute themselves whenever the execution of JBPM gets blocked by I/O.

   We've tried to execute our handlers in different threads, but as we are
running inside a persisted environment JBPM looses the JTA transaction as
it is not bound to the current thread. Seems not a solution. We tried then
to implement thread communication mechanisms, yield() and notify() and just
made the problem worse.

   Any insights on the subject? How can we execute parallel non-blocking
processes inside a shared and persisted KnowlegdeSession with JBPM?

Greets,

Alberto R. Galdo
argaldo at gmail.com
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