Groovy grails
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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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Groovy grails

Groovy & Grails

Jean Barmash

CTO, EnergyScoreCards.com

www.nywebguy.com


Agenda

Agenda

  • Groovy

    • Introduction

    • Examples

  • Grails

    • Introduction

    • Convention over Configuration

    • Build A Simple App


Groovy

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


Very sweet tons of syntactic sugar

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….


Even groovier

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


Grails

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


Grails key features

Grails Key Features

  • Convention over Configuration

    • Domain Objects

    • Controllers

    • Views

    • Services

    • Dependency Injection


Groovy grails

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


Ui features

UI Features

  • Scaffolding to generate Views

  • Layout Elements

  • VERY Easy TagLibs

  • Converters to create RESTful services


Plugins plugins plugins

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


Other stuff

Other Stuff

  • Gradle – dependency resolution

  • Gant – build tool

  • GPars – actor concurrency library

  • Griphon – Grails like framework for building Swing application


Resources

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


Groovy grails

Demo


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