Introduction to Rule-based Apps with Drools

eBusiness Technologies (ebTech) Introduction to Rule-based Applications Adrian Giurca, eBusiness Technologies, Craiova, March 2009 Dr. Adrian Giurca Brandenburg University of Technology Cottbus, Germany

Who I am ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

This lecture is about rule based applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

The student main activity: Ask questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Your knowledge on rules ,[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009 Prolog, Lisp, Guru, Godel, Mercury,... ,[object Object],Prolog, Lisp, Guru,... ,[object Object],?

What do you know about programming? Adrian Giurca, eBusiness Technologies, Craiova, March 2009 Modeling UML,... Languages Java, C, C++, ... Paradigms Procedural, OOP, Functional, Declarative, ... Methodologies RUP, Extreme, Agile,...

What's your preferred programming model? Adrian Giurca, eBusiness Technologies, Craiova, March 2009 Modeling UML? Languages Java? Paradigms OOP? Methodologies Agile?

Embedding rules in Java – Using Libraries ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Business community use natural language (NL) to express rules ,[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Logic programming (LP) is great ,[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009 ,[object Object],[object Object],[object Object]

Slide No. 11 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

This Course Goals ,[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009 A project of

Facts about Drools ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Rules are based on domain vocabularies ,[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009 ,[object Object]

Can we use UML to design rules? ,[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009 Conditions Variables Actions Rule Symbol

URML–UML-based language for rule modeling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Drools Rule Language (is almost Java!!) rule "DP_01" agenda-group "driver-premium" salience 10 when //If young driver, married and located in //one of CA, NY or VA $driver:YoungDriver( maritalStatus == MaritalStatus.MARRIED, usState == "CA" || == "NY" || == "VA", $policy:vehicleInsurancePolicy) then //increase policy premium by $700 $policy.setPremium($policy.getPremium()+ 700); $driver.setPolicy($policy) drools.modifyObject($driver); end Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Can you write this rule using logic ? (Of course) IF youngDriver($driver)AND maritalStatus($driver, "married") AND (usState($driver, "CA") OR usState($driver, "NY") OR usState($driver, "VA")) AND vehicleInsurancePolicy($driver, $policy) AND THEN premium($policy, $premium) AND retract(premium($policy, $premium)) AND retract(vehicleInsurancePolicy($driver, $policy)) AND assert(premium($policy, $premium+700)) AND assert(vehicleInsurancePolicy($driver, $policy)) Adrian Giurca, eBusiness Technologies, Craiova, March 2009 ,[object Object]

What about this representation? IF driver($driver, type("youngDriver"), maritalStatus("married"), vehicleInsurancePolicy(policy($premium)) )AND .... Adrian Giurca, eBusiness Technologies, Craiova, March 2009 ,[object Object],[object Object],[object Object],[object Object]

Many commercial usages of rule engines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Do you like rule-based applications? ,[object Object],[object Object],Adrian Giurca, eBusiness Technologies, Craiova, March 2009

Introduction to Rule-based Apps with Drools

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Introduction to Rule-based Apps with Drools