Spring ActionScript

Christophe Herreman www.herrodius.com <Flex:Camp/> Belgium 11 December 2008 Prana goes Spring Introducing Spring ActionScript

What is Spring ActionScript ?

An Inversion of Control (IoC) Container for ActionScript 3.0

Based on Java Spring

Current release 0.6

Incubated as a Spring extension, working towards a 1.0 release

June 6, 2009 Spring ActionScript | <flex:camp/> Belgium

What is Spring ActionScript ?

Cairngorm support

PureMVC support

Reflection API

Several Utilities (Assert, FlexUnitTestCase, …)

Domain base classes (Entity, ValueObject, …)

AOP, MVCS, …

What is Inversion of Control ?

Inversion of Control, also known as IOC, is an object-oriented programming principle that can be used to reduce coupling inherent in computer programs.

Types of Inversion of Control ?

Dependency Lookup

Dependency Pull

Contextualized Dependency Lookup

Dependency Injection

Constructor Injection

Setter Injection (see MXML)

Constructor Injection

Class MyClass {

public function MyClass(dependency:IDependency) {

this.dependency = dependency;

}

public function doSomething():* {

var somethingDone:* = dependency.getSomethingDone();

return markAsDone(somethingDone);

}

}

var instance:MyClass = new MyClass(new ConcreteDependency());

instance.doSomething();

Setter Injection

Class MyClass {

private var dependency:IDependency;

public function set dependency(value:IDependency):void {

this.dependency = value;

}

public function doSomething():* {

var somethingDone:* = dependency.getSomethingDone();

return markAsDone(somethingDone);

}

}

var instance:MyClass = new MyClass();

instance.dependency = new ConcreteDependency();

instance.doSomething();

Inversion of Control?

Prefer setter injection

Type to interfaces !!!

Centralized configuration

Maintainability

Reusability

Testability

...

Though counter-intuitive at first !

What is an IoC Container ? Creates and assembles components/objects and manages their lifecycle. Spring ActionScript uses an XML dialect to define the “application context” (what objects are available and how they are related) June 6, 2009 Spring ActionScript | <flex:camp/> Belgium

The Application Context // setter injection <objects> <object id=“instance” class=“MyClass”> <property name=“dependency” ref=“dependency”/> </object> <object id=“dependency” class=“ConcreteDependency”/> </objects> June 6, 2009 Spring ActionScript | <flex:camp/> Belgium

The Application Context // constructor injection <objects> <object id=“instance” class=“MyClass”> <constructor-arg ref=“dependency”/> </object> <object id=“dependency” class=“ConcreteDependency”/> </objects> June 6, 2009 Spring ActionScript | <flex:camp/> Belgium

Working with the IoC container <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="onCreationComplete()“> ... private function onCreationComplete():void { _applicationContext = new FlexXMLApplicationContext(“application-context.xml”); _applicationContext.addEventListener(Event.COMPLETE, onApplicationContextComplete); _applicationContext.load(); } private function onApplicationContextComplete(event:Event):void { var instance:MyClass = _applicationContext .getObject(“instance”); } ... </mx:Application> June 6, 2009 Spring ActionScript | <flex:camp/> Belgium

Application Contexts

XMLApplicationContext

AS3 compatible

FlexXMLApplicationContext

Flex specific: adds support for ArrayCollection, …

IoC Container Conclusion

Objects defined in external XML file

Loaded at runtime

Centralized dependency management

Managed by container

Deploy your application with different configurations without recompiling!

Resources

www.pranaframework.org

www.herrodius.com

Objects Reference (the IoC container): http://static.springframework.org/spring/docs/2.5.x/reference/beans.html

Forum: http://forum.springframework.org/forumdisplay.php?f=60

SVN: https://src.springframework.org/svn/se-springactionscript-as

FishEye: https://fisheye.springframework.org/browse/se-springactionscript-as

Jira: http://jira.springframework.org/browse/SESPRINGACTIONSCRIPTAS

WTP: http://download.eclipse.org/webtools/updates/

Questions?

Spring ActionScript

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