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(a)kpitcummins.com |www.kpitcummins.com
P Please consider the environment before printing this e-mail
________________________________
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@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@kpitcummins.com<mailto:Abhay.Chaware@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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