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Geoffrey De Smet Why do I need the Guvnor BRMS?
Guvnor agenda ,[object Object]
My business requires domain expertise
My business rules change often
Auditable and reproducible
Future improvements
Use cases I have hammer, so every problem is a nail?
The myth ,[object Object]
Drools is  Turing complete ,[object Object],[object Object]
Not imperative like Java, Scala, Groovy, ...
Declarative like RegEx, SQL, JPA-QL, … ,[object Object],[object Object],[object Object]
Change often/fast
Use cases ,[object Object]
Insurances acceptance and fee calculation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Mortgages example
Developers don't like data input from spreadsheets ,[object Object]
Which field has the result our application need? Version 1 Version 2
Mortgage experts like the flexibility of spreadsheets ,[object Object],Invalid: must be a number ,[object Object]
when income below 1000 and age above 50
when income below 1% of mortgage amount
Data model in Guvnor ,[object Object]
or  Design the model in Guvnor:
Mortgage  experts like the flexibility of Guvnor ,[object Object]
My business requires domain expertise Only mortgage managers understand mortgage rules
Schooled domain expertise ,[object Object]
participated in mortgages conferences/courses? No
years of mortgage customer experience? No ,[object Object]
Are we, the developers, domain experts?  No ,[object Object]
Domain experts can not read/write Java source code ,[object Object],for  (Mortgage m :  mortgages ) { for  (Applicant a : m.getApplicants()) { if  (a.getAge() >  70 ) { boolean  existsGuarantor =  false ; for  (Guarantor g : m.getGuarantors() { if  (g.getAge <  60 ) { existsGuarantor =  true ; } } // Will they spot the bug in this code? if  (existsGuarantor) { m.setApproved( false ); } } } } ,[object Object]
Domain experts can read/write DRL with Guided Rule Editor Change

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2011-03-29 London - Why do I need the guvnor BRMS?