[rules-users] Drools and threads

[Wolfgang Laun]

2011/5/17 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>

>  Hi
>
> I have few questions about Drools.
>
> Are rules compiled, partially compiled or interpreted ?
>

Rules are indeed compiled, but any system where the order of execution
is so highly dynamic has to do some operation in an interpretative mode.



> When I call fireAllRules(), does it ( or can it ) create a new thread that
> runs parallely or the operation is sequential and the caller program HAS TO
> wait till all rules execution is done ?
>

No special thread is created. fireAllRules() returns when no more rule
activations are to be "fired".


> Also, How is the application data integrity guarantied? E.g. what happens
> when some of the facts are changed in middle of rules being executed .. ?
> what should happen ?
>

When a rule activation is executed, the code of the consequence frequently
changes one or more facts. This results in reevaluations of rule conditions,
etc. This is just the way Drools works.

-W




> -abhay
>
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