Practical Grails

Practical Grails Denver Open Source User's Group April 2009 Scott Ryan Soaring Eagle L.L.C. [email_address]

Agenda
Grails Overview
Grails Architecture
Domain Layer
Controller Layer
Service Layer
Presentation Layer
Build, Develop and Deploy
Security
Plugins

Overview
Groovy Based
Convention over configuration
Don’t Repeat Yourself (DRY)
Lots of code generation and scaffolding
Leverages Leading Java Frameworks
Spring, Hibernate, Quartz, JSP, Ajax, Sitemesh,...

Overview
Wide IDE Support
Intellij, Netbeans, Eclipse, ....
Wide Server Support
Jetty, Tomcat, Websphere, Weblogic, Glassfish, Geronimo
Very Dynamic development Environment
Two Current Versions
1.0.4 (Groovy 1.5) and 1.1 (Groovy 1.6)
Huge Productivity Benefits
Leverages Java and JVM (Scalable)

Demo
Trading system

Architecture
Domain Layer
Gorm
Controller Layer
Service Layer
Presentation Layer
Configuration Layer
Environment and Build layer
Plugin Layer

Domain Sample Code
Sample Domain Code
Column Definition
Relationships (one to one, many to many, etc.)
BelongsTo
Constraints
Custom Hibernate Definitions
Indexes ( Simple or Complex ), Blobs
Base Domain Class

Reference Data Handling
Table Based
One or many
String Based
Enum Based
1.0.4 Stores Ordinal
Temporary trick
1.1 Can store String
Plugins

Domain Environment Setup
Based on environment
Runtime or Build controlled
Sample Configuration File
Sample Bootstrap File

Transactions
Uses Open Session in View
Modify data with care (discard)
Spring Controlled Transactions
Can open transactions manually
Complex Transactions best done in Service layer
Batch inserts are problematic but easily addressed

Queries
Dynamic Generated GORM Queries
Simple and compound
Criteria Framework
Sorting
Hand Coded SQL
Hibernate Based
Custom SQL

Criteria Query
// returns first 10 users who have an active
// account that has been created in the last
// 30 days and that have Grails-like
// bookmarks created in the last 7 days
def now = new Date()
def users = Bookmark.withCriteria {
comments {
like( "text" , "%Grails%" )
between( "dateCreated" , now- 7 , now)
}
between( "dateCreated" ,now- 30 , now)
maxResults( 10 )

Controllers
Should be light weight
Push business logic to the service layer
Remember security as REST is king
Download and upload is supported
Graphics and Reporting

Service Layer
Reusable business logic
Complex transactions
Can be injected anywhere
Domain, Controller, View
Spring Beans

Presentation Layer
Layouts
Templates
Tags
Link Building
Images and CSS
Custom Taglibs

Ajax
Built in with prototype
Can use other frameworks
Best practices to use shared templates

Build and Configuration
Multiple Environments
3 defaults
Gant Based and Maven (1.1)
BIG War's but can make them smaller with some work
Lots of targets

Security
Use a framework to start
Remember this is a REST Application
Leverage Custom filters
Encrypt what you need to

Plugins
Framework for adding functionality
Can be used to optimize applications
Can be used to add functionality to base framework
Easy to install
1.1 improves the architecture
Hard to tell what is useful and supported

Favorite Plugins
Spring Security
Quartz
Grails UI and Charting
Mail
Settings
Help Balloons
mor.ph
Testing (Included in 1.1)

Questions
Contact Me
Scott Ryan
[email_address]
www.soaringeagleco.com

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Practical Grails

by Soaring Eagle L.L.C. on Apr 11, 2009

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