[rules-users] Task Handler blocking

[Mauricio Salatino]

Hi Alberto,
yes you can, the only thing that you need to do is deal with those I/O
blocking operations as external and Async Tasks. Instead of making your
Task sync (which will block by definition until your operations are done)
just make them async by removing the completeWorkItem() method call from
inside the workItemHandler. Then when you I/O's are done, you will need to
call the completeWorkItem using
ksession.getWorkItemManager().completeWorkItem() method.

Cheers

On Wed, Oct 17, 2012 at 1:35 PM, Alberto R. Galdo <argaldo at gmail.com> wrote:

> 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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>


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