Rodrigo Andrade rcaa2 at cin.ufpe.br

What is GRAILS? Web framework Runs on the JVM Uses Java like dynamic language Groovy

Inspired on Ruby and Ruby on Rails

Grails stack

JEE

Spring

Hibernate

Java language

SiteMesh JDK

JVM

Groovy

Grails

What does it include? MVC

.gsp

Servlet container

GORM

Database

i18n

Build

Test support

Doc engine

MVC View

Controller

Model

Data Base

Project Structure

Hands on

Creating first app

> grails create-app Pomodoro

Domain Classes Model the application Entities

Constraints Validate several properties Properties mapped to DB Examples State minimum value for an int field Define that a String must not be blank Validates email addresses or URLs Declare that the value of a field is unique …

Relationships 1.

One-to-one static hasOne

2.

One-to-many static hasMany

3.

Task Many-to-many hasMany on both sides belongsTo in the owned side

4.

Many-to-one Define a property of another Domain class belongsTo makes it bidirectional (cascade) It duplicates values

Tag

Controllers Handle incoming web requests Redirects Rendering Check permissions Ask Domain and give the result back to the requester Convention: Controller scaffold

Controller action Defines a new Task using params

Tries to save taskInstance

Renders the create page showing problems

Task created successfully Shows the new created task instance

Generate source code Generate controllers and views We may edit this code

> grails generate-all

Views GUI Templates gsp tags html tags

http://grails.org/doc/2.2.x/guide/single.html#tags

Login view Form declaring the action Input fields

checkbox

Internationalization

i18n

Configuration files

DataSource Create a new DB and drop it later

Specifies file-based DB

BuildConfig Declare dependencies Build path

Declare plugins

UrlMappings Configures grails URL structure Defines default error page Defines index page

BootStrap Configuring start-up It is possible to define actions for start-up and shut down Examples Create instances of Domain classes on application load Send an email every time the app shuts down

Dynamic finders Task.findAllBySummary(“”) Task.findByDetails(“”) Task.findAllByDateCreatedLessThan(date) …

Plugins

Leopoldo Teixeira

Grails plugins Combine applications Software reuse Tomcat, JQuery, Database migration, Mail support, Authentication… http://grails.org/plugin/

Apache Shiro Plugin Authentication Access control Roles and permissions Security layer > grails install-plugin shiro > grails shiro-quick-start --prefix=pomodoro.

Deployment > grails war

Done creating WAR target/pomodoro.war

Cloudbees.com Send your application to the cloud

How to get Grails? Download and install Java Download and unzip Grails 2.1.0

http://grails.org/doc/latest/guide/gettingStarted.html#requirements http://dist.springframework.org.s3.amazonaws.com/release/GRAIL S/grails-2.1.0.zip

IDE support

Based on Eclipse

Free http://www.springsource.org/sts

Free community edition http://www.jetbrains.com/idea/

Rodrigo Andrade rcaa2 at cin.ufpe.br