Hi Michael,
thanks for the reply. I hadn't thought of using a function - that might be
the best way for now. I had thought about writing my own semantic module -
that might be the most elegant long term solution.
Adrian.
Michael Neale
<[EMAIL PROTECTED] To:
[email protected]
mail.com> cc:
Subject: Re: [drools-user] best
practice for ruleset constants?
17/01/2006 10:56
Please respond
to user
You can actually put constants in functions, and use them in rules as you
would normally.
<java:functions>
public static final int SOME_VALUE_HERE = 42;
public static final String ANOTHER_CONST = "Slartibartfast";
</java:functions>
But I am not sure if thats exactly what you want. If these are parameters
that you want users to tweak on the fly, probably best to put them in a
properties file, or a database with a web front end to change them. The
rule
engine can then access them as application data, as you said. In Drools 2
there isn't really another way to make it neater (short of creating your
own
XML language, which might be more work then you are prepared to do).
On 1/17/06, Adrian Bigland <[EMAIL PROTECTED]> wrote:
>
>
> Hi all,
>
> I need several constants in a ruleset - they represent confidence factors
> (weights) for different inputs.
>
> These weights are decided by the business and need to be changed in the
> same way as the business rule logic, so I'd like to represent the values
> in
> the ruleset definition file.
>
> I also need to use the JSR-94 API.
>
> My question is - what is the most elegant way to set up these constants
in
> a rule file.
>
> I can think of a few possible approaches, but I haven't figured out a way
> to do it yet:
>
> - application data - but I have yet to find out how to set the values in
> the rulefile.
> - use rules to assert values - I'm currently trying to figure out how to
> control when these fire.
>
> Am I trying to do something in a very non-rule engine way here? Or has
> anyone had some experience of doing this that they would like to share?
>
> Thanks,
>
> Adrian Bigland.
>
>
>
>
>
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