[rules-dev] Rule Parameters/Aliases

[Anstis, Michael (M.)]

I am not sure re-posting the same questions a couple of weeks later will
give any better responses.

I also know this would better be addressed to the users forum and not
the developers'.

With regards,

Mike

-----Original Message-----
From: rules-dev-bounces at lists.jboss.org
[mailto:rules-dev-bounces at lists.jboss.org] On Behalf Of Yoni Mazar
Sent: 09 July 2008 12:51
To: rules-dev at lists.jboss.org
Subject: [rules-dev] Rule Parameters/Aliases


Hi all, 

We are at the begining of a new clinical decision-support project. 
We plan using drools (using Eclipse) in order to manage and execute our
business logic. 
As part of our research, we also evaluated JRules which has a feature
that
is very important to us and we could not find in Drools. 
Unless we missed it out, we will probably try and add this functionality
ourselves.

In JRules, one can define a ruleset (corresponds to a package) with
parameters. Each parameter has a datatype (a class), a direction
(in/out/inout), and an alias. 
Then, within the rules, the user can refer to the parameter alias. For
example, a user can define a ruleset with the following parameters: 

*class=LabResult, direction=in, alias=hemoglobin 
*class=LabResult, direction=in, alias=creatinin 

Then, within a rule, one can write: 
when hemoglobin.value<10 and creatinin.value>34 
then... 

Now, the application retrieves the patient data accordingly (hemoglobin
and 
creatinine data separetly - even though they are of the same type) and
sets
the ruleset parameters: 
ruleset.parameters.add("hemoglobin",hemoglobinFact) 
ruleset.parameters.add("creatinin",creatininFact) 

It is important that the definition of the aliases will be done outside
of
the rule (and not by defining in-rule variables)

This approach simplifies the rules since some of the filtering is being
applied externally (not in the rule itself)

Does someone has an idea how to bridge this gap using Drools? 
Are there any workarounds that can be used in order to avoid changes in
code?

And here we can use your help:
We are new to Drools (and still have to dive into the big ocean of code
that
exists). 
The following features

1) defining parameters (in the package level...something like import)
2) adding in/out modifiers (can be used in LHS, RHS, or both)
3) allowing assignment of aliases to parameters 
4) adding such functionality to the rule editor (auto-complete ,type
safety)

Where should we start?
Do you have any ideas that can help start this process (e.g. relevant
classes, modules)?
We would appreciate any help regarding any of the items in the list
above.
Any hints, suggestions, directions, referals and so on.

Thanks a lot.

Yoni

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