[rules-users] functions

[Chris Richmond]

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 at lists.jboss.org
[mailto:rules-users-bounces at 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 at 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 at lists.jboss.org
[mailto:rules-users-bounces at 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 at 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


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

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