[rules-users] StatefulKnowledgeSession leaves threads running

[Rafael Ribeiro]

Edson:

 Is it a code change inside Drools or is there any other shutdown method
that I may call ?

Mark:

 I completely agree with this future change, it makes much sense in an
AppServer environment where we shouldn't be handling thread creation and
disposal by ourselves.

regards,
Rafael


2009/7/17 Edson Tirelli <tirelli at post.com>

>
>     The problem here is a different one. The engine is calling shutdown()
> on a thread pool and even without any task being executed, the thread is
> blocked in an internal JDK queue waiting for the timeout. I replaced the
> call by shutdownNow(), forcing the jdk to signal an interrupt to the thread
> and this seemed to work. I am investigating side effects of this procedure
> right now.
>
>     []s
>     Edson
>
>
> 2009/7/16 Mark Proctor <mproctor at codehaus.org>
>
> Rafael Ribeiro wrote:
>> > Hi all,
>> >
>> >  I've downloaded Drools fusion sample and started to make some changes
>> to
>> > the code (first of all wipe out the UI so I can test it easier).
>> >  I tried to get to a minimal set so I can run a console main class and
>> see
>> > what happens but I am facing a strange behaviour.
>> >  As soon as I start pushing events into the WorkingMemoryEntryPoint
>> > ("StockTick stream") a Thread - not daemonized since it blocks shutdown
>> from
>> > ending - is spawned and this prevents my JVM from shutting down
>> (obviously
>> > if I call System.exit(0) it will but I am avoiding this).
>> >  I've tried both to halt and dispose the session that this entry point
>> > belongs but with no success. Does anyone know how could I get rid of
>> this
>> > thread?
>> >
>> Drools is starting up threads in a number of places now - using "new
>> Thread()". I think the plan is to change this to an interface call that
>> allows pluggable implementations. So that the user can decide how
>> threads are executed and stopped.
>>
>> Mark
>> > best regards,
>> >
>>
>>
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>>
>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss by Red Hat @ www.jboss.com
>
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