[rules-users] Drools and threads

[Wolfgang Laun]

2011/5/19 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>

>  Correct. But does it then internally build the DRL into binary/compiled
> format and then uses it for updating knowledge base ?
>
>
>

Yes - Builder's output is always the same.
-W



>  ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Wolfgang Laun
> *Sent:* Thursday, May 19, 2011 11:59 AM
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools and threads
>
>
>
> You can feed a KnowledgeBuilder with a number of data formats, DRL being
> just one of them. The full standard procedurefor building is to add one or
> more resources to the builder (indicating its type), check for errors and
> create a KnowledgeBase; then proceed with a session, etc.
>
> -W
>
>  2011/5/19 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>
>
> Little confused about the third question I had, about rules compilation. I
> now know that rules are to be compiled.  When I use Guvnor, I have to
> package the rules ( this is where they are compiled into binary format )
>  and download the package file and feed it into the production memory /
> knowledge base using changesets/agents.
>
>
>
> But I have also seen examples of drools and also created a few ones where I
> build the eclipse project and package the entire app as webapp ( .war ) and
> the rules file is in the classes/lib directory as a .drl file. ( uncompiled
> ).  And it still works !   Does the drools runtime compile it at runtime ?
> and then uses it or what ?
>
>
>
> Regards,
>
>
>
> Abhay Chaware
>
> Sr. Designer | KPIT Cummins Infosystems Ltd | Board: +91 020 6652 5000 |
> Extn: 2989  | abhay.chaware at kpitcummins.com |www.kpitcummins.com
>
> P Please consider the environment before printing this e-mail
>   ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Wolfgang Laun
> *Sent:* Tuesday, May 17, 2011 3:31 PM
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools and threads
>
>
>
>
>
> 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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