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Calculate formulas in elegant way?

 
Valdir Mendes
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Posts: 8
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Hi guys,

This is my first post (i think) and I was wondering if I could have a opinion from you all.

Today, the system I'm working on has a terrible design for business logic. The application is basically a bunch of formula "calculators" for every different client. All of them have their input/outputs and logic on it. The problem is that every single calculator is derived from a big superclass with some common procedures (and eventually subclasses overrided them ).

Well I really want to refactor this crap. I was thinking of the Interpreter pattern which I could take the similiarities of the calculators and mount its complexity based on those simple procedures.

It would look like a tree:



However, I don't want to reinvent the wheel and possibly somebody else has come across this problem. I just need to know if there is a framework, standard, pattern, whatever... to solve this problem.

I appreciate your help in advance!

Valdir.
 
James Sabre
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Valdir Mendes wrote:Hi guys,

<snip>

I was wondering if I could have a opinion from you all.

Today, the system I'm working on has a terrible design for business logic. .


If it ain't broke ...
 
Valdir Mendes
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It wouldn't be a problem if I had to create more 20 of those

I've seen Drools the business rules engine as an alternative, but I might create more complexity than simplicity. Anybody with Drools experience to share thoughts (or any other business rule engine)?
 
Wim Vanni
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Eclipse IDE Java Oracle
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Strategy and/or template pattern come to mind when I read this.

But I agree that you should make sure about the value you'd get from redesigning this system. If it's a new 'calculator' every day then I'm sure you can get whoever it is that decides to at least consider something more flexible. If it's a new one every year ... (or any other period of time that is considered 'long'

Cheers,
Wim
 
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