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Drools5 Community Training DSL & Decision Tables Sponsored by Plugtree

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Module 6: Drools Expert DSL & Decision Tables Drools5 Community Training version: 1.0-SNAPSHOT Release Date: 03/16/2011Under The Creative Common License

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Module 6: Drools Expert DSL & Decision Tables Drools5 Community Training Course by Mauricio "Salaboy" Salatino and Esteban Aliverti is licensed under a Creative Commons Attribution 3.0 Unported License.Based on a work at salaboy.wordpress. com. Permissions beyond the scope of this license may be available at http: //salaboy.wordpress.com/.

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Agenda● Other ways to express rules ○ Domain Specific Languages ○ Decision Tables

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Other ways to express rules ● DSL -> Express Rules in natural Language● SpreadSheets -> Express rules as decision tables

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Domain Specific LanguagesExample:DRL:Song(genre == "Jazz")DSL: [Condition]There is a Jazz Song = Song(genre == "Jazz")

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Domain Specific Languages● Focused on Subject Matter Experts● Natural Language● Can be used in guided editor● Its just mapping your business language in DRL

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DSL ExampleDSL files have two main sections (condition / consequence) with thefollowing semantics: [condition or consequence] natural language expression = drools mapping/execution expressionDSL semantics allow binding of variables in the natural languageexpression to the drools expression: When the user is called {userName} = User(name== "{userName}")DSL resources must be added to kbuilder previous to DSLR

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DSL Full ExampleDSL File DSLR File

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Decision Tables● More business-user friendly● Useful in situations when we have a lot of similar rules● Drools supports XLS or CSV files● Behind-the-scenes Drools transforms Decision Tables to vanilla DRL

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Decision Tables Example

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Hands on LabsProjects: ● 04 :: Drools Expert Spreadsheet Example ● 05 :: Drools Expert DSL Simple Example

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Questions?

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Enjoy! Questions and Feedback arealways appreciated!

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Contact us atwww.plugtree.com