Mike, thanks for the detailed reply. It looks like with your example, that we
can do this calculation portion with drools. To answer your question, the
business entities are hierarchical. Here is a simplified example:
Student
Name
Student Number
Home Address -> Address Entity
Email
ApplicationCol -> Collection of Application Entities
Address
Street
City
Province
Application
Program
Period of Study
Tuition Cost
Scholarships
IfMarried
Number of Children
Rent Cost
Assessment Results
Total Need
Total Resource
Total Eligible Loan Amount
A second part to the process is a workflow like process that allocates the
money for the student loan from many grants and loan types. Here is the high
level logic:
For each pre-loan grant fund
If learner has eligibility for the fund then
Determine amount from fund
Allocate amount to application
Endif
End-for
Federal portion is minimum of assessed need and number of program weeks
* federal monthly amount
Reduce federal portion if beyond lifetime maximums
Calculate provincial portion as remaining portion of loan amount
Reduce provincial portion if beyond lifetime maximums
Do not distribute unless greater than minimum loan amount
For each not pre-loan grant fund
If application has eligibility for the fund then
Determine amount from fund
Allocate amount to application
Endif
End-for
Calculate LRC Remission
It would be nice to keep this flow of logic in one place as this mimics how the
business does it today, and maintainability is one of the three major
objectives we are trying to accomplish. The more I read about drools, the more
I believe it is not suitable for workflow type process. What open-source
workflow products are people using that work well with Drools?
Thanks
Don
________________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Anstis, Michael
(M.)
Sent: Friday, November 09, 2007 2:14 AM
To: Rules Users List
Subject: RE: [rules-users] Rules for Hierarchical Type Calculation Formulas
Are the parameters for the calculations hierarchical in your model or are there
just many components to each equation? For example:-
Rule "Total Resource"
when
$s : Student( $e : employmentEarnings, $ss : scholarships, $a : assets)
then
insert(new TotalResource($s, $e + $ss + $a);
end
Rule "Child Care Expenses"
when
$s : Student( $nc : numberOfChildren, $pca : perChildAmount)
then
insert(new ChildCareExpenses($s, $nc * $pca);
end
Rule "Total Need"
when
$s : Student( $t : tuition, $la : LivingAllowance, $cce : childCareExpenses)
ChildCareExpenses(student == $s, $cce : amount)
then
insert(new TotalNeed($s, $t + $la + $cce);
end
Rule "Total Eligible Loan Amount"
when
$s : Student($maa : maxAllowedAmount)
TotalNeed( student == $s, $n : amount)
TotalResource( student == $s, $r : amount)
then
insert(new TotalEligibleLoanAmount(Math.min($n - $r, $maa));
end
Possible? Yes. Performant? Performance depends upon many factors (number of
students, hardware, subjective definition of performant); but there have been
many postings suggesting Drools is as quick, if not quicker than other
commercial engines.
There are plenty of ways to skin an apple.
With kind regards,
Mike
________________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Don Cameron
Sent: 08 November 2007 23:28
To: [email protected]
Subject: [rules-users] Rules for Hierarchical Type Calculation Formulas
We have been using a custom rules engine successfully for our 1000+
rules for our student loans application, but these rules are decision
based types rules (if then else).
For assessing loan amounts for our student loan application, we have
over 400+ calculation formulas plus decision logic. These formulas are
mostly simple:
TotalEligilbleLoanAmount = Min(TotalNeed - TotalResource,
MaxAllowedAmount)
TotalNeed = Tuition + LivingAllowance + ChildCareExpenses
ChildCareExpenses = NumberOfChildren * PerChildAmount
TotalResource = EmploymentEarnings + Scholarships + Assets
(however there are 400+ formulas and the hierarchy gets up to 20 deep)
Is it possible to implement something like this in Drools? Will it be
maintainable and performant?
Thanks
Don
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