The only requirement in this case is that when you create the KnowledgeBuilder and starting adding the resources to it (DRL, flows, dsls, etc), a given resource can only reference an asset that was previously loaded. So, you must make sure the DRL with your functions is the first resource to be added. Other than this, everything else should work just fine.

    []s
    Edson
  


2009/6/18 Chris Richmond <crichmond@referentia.com>

Yes….for the most part, a non developer wouln’t be able to write the rules anyway….you need someone with domain knowledge of the objects being injected, so I don’t see a non developer writing rules.    I was trying to take the approach that if, from the application code perspective, I only worrry about injecting objects I wish to reason on, and not try to think of new functions, new stats/bookkeeping classe I might need..if I can demonstrate doing that all within the rule, it seems to show it’s flexibility more than having to modify your codebase(beyond simple session/api calls) to analyze those objects you are injecting.  

 

One think to keep in mind is that I am utilizing mainly Fusion…since I am dealing with sensor type data simply being fed into the system contintuously, so It’s very fluid as to the types of calculations/rules I might have to implement compared perhaps with a standard business object type of data.   I want to become a guru and munging, creating, and using all sorts of constructs within Fusion for being able to accomplish almost any rule withought having to do anything besides simply injecting my sensor data ojbects into the memory stream…in my mind, that will lead me to the greatest flexibility and demostration of the power of being able to add the rules engine onto an already fully functioning and robust application that was written without planning for rules automation.  

 

I should mention I do not use the eclipse plugin or eclipse at all for my rules testing/development, so I don’t have any issues with eclipse plugin not breaking.

 

So….assuming I *did* want to put a simple function in my .drl file….*where* do I have to put it?  My oringal question about how to make a simple function declaration is still a mystery to me.  

 

Thanks

 

Chris

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Thursday, June 18, 2009 2:25 PM


To: Rules Users List
Subject: Re: [rules-users] functions

 


   Chris,

   I understand. Although functions in DRL files where conceived to be very simple things to reside with the rules. So, although you can have a DRL file with all your functions and, as long as this file is the first you load into your knowledge builder, use the functions on other files, we did not implement any king of specific multifile import... meaning that the eclipse plugin, for instance, will raise errors when accessing functions from one file into another... but your application will run fine...

   Regarding recompiling the application, I think you just said that meaning recompiling the java file with the functions right? since the java file can be anywhere, including your domain model jar or even in a jar by himself... in any case, be it a function or a java static method, it is code and you will need a developer to do it, right?

   []s
   Edson

2009/6/18 Chris Richmond <crichmond@referentia.com>

Edson,

 

Thanks…and I am considering that option as well…but the nice thing about the functions in the drl file is the system remains much more fluid..in other words, if I can focus on doing what I want to do all within the DRL file, it proves the flexibility of the system more to me than having to have  developer recompile the application itself with new classes.  Does that make sense?   Also, I would just like to know that I can actually make functions work for future reference.

 

Thanks,

 

Chris

 

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Thursday, June 18, 2009 1:15 PM
To: Rules Users List
Subject: Re: [rules-users] functions

 


   Chris,

   If you are creating a function library, why don't you create it as static methods in a java class? easier to develop, to unit test and you can use "import function" in the DRL to import all of them.

   []s
   Edson

2009/6/18 Chris Richmond <crichmond@referentia.com>

Ok…I am trying to build a function library in my .drl file and I added this one test function

 

function String outputString(String sData){

    return sData;

}

 

And no matter where I place this in my .drl file, I get an exception one way or the other with compiling when I try instaniate and fire my rules.  The .drl file works exactly as expected if I remove this function declaration, and when I *do* try to add it, I do not actually call it anywhere…but get those errors.  

 

So my question is, where exactly do I need to place function declarations..

 

 

Thanks,


Chris

 

 


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--
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com


_______________________________________________
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users




--
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com


_______________________________________________
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users




--
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com