Grails Plugins DJUG and Colorado Springs Open Source User's Group 2009

Grails Plugin Magic Scott Ryan Soaring Eagle L.L.C. [email_address] March 2010 Colorado Spring Open Source User Group

Agenda
Grails Overview
Plugin Architecture
Sample Plugins
Other Modification Options
Q & A

What do you know?
Grails
Java, Groovy
Spring, Hibernate
Maven , Ivy

Grails Overview
Integrated framework based on Groovy
Spring MVC / GSP
Spring
Hibernate
GSP
Sitemesh

Grails Overview
Convention over configuration
Dynamic framework for ease of development
Lots of code generation
Plugin Framework allows extension

Grails Benefits
Supports Java Framework Leadership Technologies
Quick development turn-around
Good performance
Easy extensibility
Runs on the JVM

Plugin Functions
Integrate new libraries
Add incremental Functionality
Exchange Frameworks
Inject or Modify behavior
Add build support
Can include other libraries or plugins

Plugin Development
Uses standard Grails Application
grails create-plugin name
Update the plugin class
Create the plugin
grails package-plugin
grails release-plugin
grails install-plugin (local or repository)

Plugin Integration
Plugins never modify application main source
Source is copied to /plugins/-name-/grails-app
Static resources are copied to web-app/plugins/-name-/js etc.
Plugins never modify web.xml or application.xml
${pluginContextPath} variable helps locate resources

What can I do in a Plugin?
Add Basic Artifacts (Controllers, GSP , Services, etc.)
Integrate with build script events
Integrate with runtime configuration
Add Dynamic Methods
Integrate with auto reload events

Adding Basic Artifacts
Domain,Controllers, Services, GSP
Follow conventions
Try to use unique names (UGH)
Use packages for all code
Integrate with conf.groovy or provide config file
Remember you are only a guest

Scripts
_Install.groovy
Called on installation
Can be used to copy or modify files
Gant based
_Upgrade.groovy
Called on upgraded
Gant based

Hooking into Build Events
_Events.groovy
One per plugin
Per User file in .grails user directory
Open Framework
Closures begin with “event” and then the name of the event
Trigger events with event method
event( eventName, message)

Integrating with Runtime
doWithSpring closure
Allows you to add to the spring configuration using spring bean builder syntax
doWithWebDescriptor closure
Passes in the xml variable
doWithApplicationContext closure
Run after the application context is assembled
Passes in the application context

Adding Dynamic Methods
doWithDynamicMethods closure
Grails artifacts expose the metaclass via the expandometaclass to add methods, constructors, etc.
Other classes allow you to use the metaclass to add methods, constructors, etc.
Application context is passed in so you can interact with artifacts within it.

Sample Plugins
Jquery
Hibernate Filter
Falcone
Multi tenant

Grails Plugins DJUG and Colorado Springs Open Source User's Group 2009

by Soaring Eagle L.L.C. on Feb 13, 2011

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Grails Plugins DJUG and Colorado Springs Open Source User’s Group 2009 — Presentation Transcript