[rules-users] programming classes to represent domain in Drools like templates

[Welsh, Armand]

Keep in mind that using these Declared Types in DRL will have an impact in high volume systems.  Each time a knowledge session is initialized, these classes are dynamically loaded onto the class-path.  This dynamic loading (and unloading) subjects your knowledgesession to a large amount of garbage collection.  As a result, if you have a high volume processing system you could very quickly reach a heap exception due to insufficient garbage collection.  In real-time point processing this does not cause a problem, but in high volume processing it could.

I have noticed that in my high-volume applications, anytime I use decalred types or DRL functions, that my rules run about 20% slower than when I use the exact same code in my JAVA system, and have Drools access them as imported functions, and types.  (because they are local to the app, Drools does not have to invoke the class loader on all these objects, which does slow down processing time).

Keep in mind, I don't know the details of what drools is doing, but I have observed behavior in the JVM via monitoring tools to support this claim at a basic level.  So go ahead and use declared types, but if you find yourself running into a bunch of weird processing errors, it may be because of the declared types.

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Esteban Aliverti
Sent: Monday, November 14, 2011 3:21 AM
To: Rules Users List
Subject: Re: [rules-users] programming classes to represent domain in Drools like templates

If you don't want to define your model as Java classes you can define it in drl syntax: http://docs.jboss.org/drools/release/5.3.0.Final/drools-expert-docs/html_single/index.html#d0e3390

Best Regards,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com

On Mon, Nov 14, 2011 at 12:06 PM, santiago carbonell <scarbonell at ono.com<mailto:scarbonell at ono.com>> wrote:
Hi,

I'm new in drools and I'm doing some test with this fantastic engine. With
Drools, I've loaded a drl file with some rules and ran with drools engine
and works perfect, but I got to preset/programming some classes in Java
about the domain where rules worked.

I'd like to load this domain, this "classes" as a file, like drl files, but
insted of rules, I'd like to load classes, or domain, so I'd needn't to
preset/programming this classes in Java.

My question is how can I load this classes in some file, like drl files with
rules? Is like templates in clips.

Thanks


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