Rules engine

Rules engine design pattern demonstration and samples. Link to the github repo with samples - https://github.com/stanimirtt/rules-engine

1. Rules Engine Design Patterns

2. Rules engine R eplacing imperative model: commands in sequence with conditionals and loops set of rules – each rule has condition and action

3. Rules engine address the following issue if car.owner.hasCellPhone then premium += 100; if car.model.theftRating > 4 then premium += 200; if car.owner.livesInDodgyArea && car.model.theftRating > 2 then premium += 300 ;

4. The solution

5. Rules engine diagram

6. What are the benefits S ingle Responsibility Principle (SRP ) O pen/Close Principle (OCP) L iskov substitution principle (LSP) I nterface segregation principle D ependency inversion principle

7. Resources http:// www.codeproject.com/Tips/808058/Reasons-for-using-design-patterns http:// martinfowler.com/bliki/RulesEngine.html http://www.michael-whelan.net/rules-design-pattern /