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Groovy & Grails

Groovy & Grails. Jean Barmash CTO, EnergyScoreCards.com www.nywebguy.com. Agenda. Groovy Introduction Examples Grails Introduction Convention over Configuration Build A Simple App. Groovy. Dynamic Language on JVM Focus on programmer productivity Focus on Essence vs. Ceremony

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Groovy & Grails

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  1. Groovy & Grails Jean Barmash CTO, EnergyScoreCards.com www.nywebguy.com

  2. Agenda • Groovy • Introduction • Examples • Grails • Introduction • Convention over Configuration • Build A Simple App

  3. Groovy • Dynamic Language on JVM • Focus on programmer productivity • Focus on Essence vs. Ceremony • Superset of Java • Native Java Library Integration • Compiles into Java • Dynamic Typing • Native Syntax for Lists, Maps, Sets, Ranges

  4. Very Sweet – Tons of Syntactic Sugar • Tons of Options • Optional parentheses • Optional semicolons • Optional Return • Safe Dereferencing • Autoboxing • GStrings • Regular Expressions • Autogenerated Setters / Getters • Even Elvis….

  5. Even Groovier • Closures • MixIns & Categories • Advanced MetaProgramming Capabilities • AST (Abstract Syntax Tree) Transformations • Great XML Processing Capabilities • Object Builders / XML Builders • Easy to make DSLs • Google App Engine

  6. Grails • Web Development framework inspired by Ruby on Rails • Convention over Configuration • DRY – Do Not Repeat Yourself • More focused on domain objects than Rails • Underlying Libraries: • Hibernate • Spring • SiteMesh • Quartz • J2EE / Servlet

  7. Grails Key Features • Convention over Configuration • Domain Objects • Controllers • Views • Services • Dependency Injection

  8. GORM • GORM – Robust Domain Modeling Layer • Built on Top of Hibernate, which is hidden • Advanced Layer for modeling of relationships • Maps to Database over JDBC or JPA • Dynamic Finders – query the objects • CRUD Operations • Constraints • Performance Optimizations • Can be used outside of Grails, including in Java Apps

  9. UI Features • Scaffolding to generate Views • Layout Elements • VERY Easy TagLibs • Converters to create RESTful services

  10. Plugins, Plugins, Plugins • A core concept in Grails • Unit of Functionality • Unit of Reusability • Unit of Integration • Creating a plugin is almost identical to creating an application • Over 200 Plugins in all sorts of areas • Central Repository • http://grails.org/plugin/home

  11. Other Stuff • Gradle – dependency resolution • Gant – build tool • GPars – actor concurrency library • Griphon – Grails like framework for building Swing application

  12. Resources • Groovy Usage Patterns • http://gettinggroovy.wordpress.com/2009/05/20/the-gr8-conference-groovy-usage-patterns/ • Grails – www.grails.org • Groovy – http://groovy.codehaus.org

  13. Demo

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