introduction to groovy and grails - springpeople

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Introduction to

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What is Groovy?

Groovy is a dynamic, object-oriented language for the Java Virtual Machine, which builds on the strengths of Java but has additional features inspired by languages such as Python, Ruby, and Smalltalk.


What is Grails?

Grails is an open source web application framework that leverages the Groovy language and complements Java web development. Grails is a standalone development environment that can hide all configuration details or allow integration of Java business logic. It provides easy-to-use tools to build web applications in Groovy.


Grails Architecture


Groovy Testing

Groovy is a scripting language that is executed as Java Byte Code.

This allows a Mix & Match between Groovy and Java Code.

Groovy comes with an AntBuilder that allows execution of Ant scripts from usual Groovy code. This capability allows executing WebTests, since WebTests are usual Ant tasks.

By executing WebTest from a Groovy script, you can fully leverage both the variety of WebTest steps and the sophisticated language means of Groovy for structuring your tests.


Grails Controller

A controller fulfils the C in the Model View Controller (MVC) pattern and is responsible for handling web requests. In Grails a controller is a class with a name that ends in the convention "Controller" and lives in the grails-app/controllers directory. A controller can be created with the create-controller

Command: grails create-controller org.bookstore.hello


Manage Databases

Grails is really easy to get started with on green-field projects because the domain model defines the database schema, so you don't have to worry about that side of things. But what if you need to work against an existing database? In that case, you have to carefully map the domain classes yourself. If you have a large schema, that could take a while.

What about when new versions of your application go live? You can't limit the application to the original schema used for the first version, otherwise it wouldn't be able to evolve properly. You have to be able to migrate the schema and also any existing data. Both of these scenarios have corresponding plugins that can help solve the problems.


Remember to check in your migrations.

You can preview changelogs and changesets

Always check your migrations

Resetting locks

You can use Sql to assign default values to new columns

Data migration tips & tricks


Grails Service Layer

Grails defines the notion of a service layer. The Grails team discourages the embedding of core application logic inside controllers, as it does not promote reuse and a clean separation of concerns. Services in Grails are the place to put the majority of the logic in your application, leaving controllers responsible for handling request flow with redirects and so on.

Command: grails create-service helloworld.simple


How you can master Groovy and Grails?

Become an expert in 4 days.

World class Groovy And Grails training by the industry experts.

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Suggested Audience & Other Details

Prerequisites: Experience with developing application using Java, Basic web technologies such as HTML and HTTP

Suggested Audience: This training is designed for developers and architects interested in

Groovy and Grails.

Duration 4 Days

Syllabus


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