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An Introduction To Building Groovy Web Applications With Grails. Jeff Brown – brown_j@ociweb.com Principal Software Engineer Object Computing Inc. http://www.ociweb.com/. Groovy Party Tricks. Groovy-isms for the unenlightened Everything is an object GStrings Named parameter lists

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an introduction to building groovy web applications with grails
An Introduction To Building Groovy Web Applications With Grails

Jeff Brown – brown_j@ociweb.com

Principal Software Engineer

Object Computing Inc.

http://www.ociweb.com/

groovy party tricks
Groovy Party Tricks
  • Groovy-isms for the unenlightened
    • Everything is an object
    • GStrings
    • Named parameter lists
    • We don’t need no stinking setters and getters
    • Markup the easy way

A 3 minute crash course with demos on some of the features in Groovy that Java developers will find fun and interesting…

what is grails
What Is Grails?
  • Full stack MVC framework for web apps
  • Exploits the awesome power of Groovy
  • Leverages proven staples
    • Hibernate
    • Spring
    • Sitemesh
  • Excellent for those apps in the sweet-spot
  • Fun, Fun, Fun
what about the celebrities
What About The Celebrities?
  • Famous people love Grails
  • This presentation includes a number of quotes from your favorite well knowns
  • Don’t dig it just because they do
  • Just dig it!
a true visionary
A True Visionary
  • coding by convention

“Imagine no config files.

It’s easy if you try.

No action mappings.

Man, that Grails is going to be fly.”

In a rare moment of clarity, Yoko convinced John to remove this verse from Imagine since Grails hadn’t been invented yet.

wet your grails whistle
Wet Your Grails Whistle
  • Lets take a lightning fast first look…

From Nothing To CRUD In 2 Minutes…

is that all there is to it
Is That All There Is To It?
  • Is that all I can do?
  • I need to build real applications!

Holy productivity Bat Man! What are we going to do with all the free time?

grails commands
Grails Commands
  • Ant is doing some heavy lifting
  • generate-controller
  • generate-views
  • generate-all
  • run-app
  • war
  • create-app
  • create-controller
  • create-service
  • create-domain-class
  • create-job
scaffolding
Scaffolding
  • Dynamic
    • It is all just magic
  • Generated
    • Generated code may be a good starting point
domain classes
Domain Classes
  • The “M”
  • Stick to the POGO
    • Let the controller do the controlling
    • Let the view do the viewing
  • May define validation constraints
controllers
Controllers
  • The “C”
  • Traffic cop
  • Defining actions
  • Navigating to the view
views
Views
  • The “V”
  • Groovy Server Pages (GSP)
  • Custom Tag Libraries
  • Sitemesh
tag libraries
Tag Libraries
  • Provided tags
    • Logical, Iterative, Ajax, Form, etc…
  • Custom tags
    • No config files
      • Leave those TLDs behind
    • It is all Groovy
should i miss my tld files
Should I Miss My TLD Files?

I pity the fool who has to maintain all of those TLD files.

hey dude where is my data
Hey Dude, Where Is My Data?
  • *DataSource.groovy
    • DevelopmentDataSource.groovy
    • ProductionDataSource.groovy
    • TestDataSource.groovy
  • HSQL DB
    • In memory db is great for evolving schema during development
  • ApplicationBootStrap.groovy
slide16
GORM
  • Groovy Object Relational Mapping
  • Hibernate under the covers
    • JPA support slated for 0.4
  • No need to manage mapping files
    • You still can if the need arises
    • Can map Java classes
dynamic domain class methods
Dynamic Domain Class Methods
  • findBy
    • Person.findByLastName(“Brown”)
    • Person.findByLastNameAndFirstName(“Brown”, “Jeff”)
  • findWhere
    • Person.findWhere(lastName:”Brown”, firstName:”Jeff”)
  • Etc…
the end
The End

Thank you, thank you very much.