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Flex architectural patterns. James Ward Technical Evangelist [email protected] www.jamesward.com. OO / Components / Encapsulation. MXML is Declarative AS3 AS3 is OO Inheritance Interfaces Components can contain: Properties Methods Styles Events Effects

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flex architectural patterns

Flex architectural patterns

James Ward

Technical Evangelist

[email protected]

www.jamesward.com

oo components encapsulation
OO / Components / Encapsulation

MXML is Declarative AS3

AS3 is OO

  • Inheritance
  • Interfaces

Components can contain:

  • Properties
  • Methods
  • Styles
  • Events
  • Effects

Inline Classes with mx:Component

project structure
Project Structure

Library Projects

  • Reuse code across projects

Modules

  • Load blocks of code post-startup

RSLs

  • Load & cache stagnant / cross-application code at startup
  • Framework Cache
platform evolution reduced application size
Platform Evolution – Reduced Application Size

Persistent framework caching significantly reduces size of Flex applications

Users only need to download the Adobe-signed Flex 3 platform component once

Flash Player cache stores it for use by any Flex-enabled site

Entire Flex applications can now be as small as 50KB

Site B

Site A

CustomCode

CustomCode

Flex 3 RSL

Flash

Player 9

Flash PlayerCache

performance
Performance

Item Renderers

  • KEEP THEM SIMPLE!

Objects

  • Typed objects are optimized in the JIT
  • AMF!!!

Modules / Deferred Instantiation

  • Do things later...
project structure1
Project Structure

Model - View - Controller

  • Hand rolled
  • Formal frameworks (Cairngorm, PureMVC, etc)
  • Singletons
  • Singletons and Modules don’t mix

Consider where Business Logic lives

  • AIR / Offline requires client-side business logic
  • Mostly stateless back-ends
mvc service bus
MVC / Service Bus

Model

Component

View

Service

Controller

Component

testing
Testing

Unit Testing

  • Flex Unit
  • Many others

Automated Testing

  • Mercury QTP
  • SilkTest
  • Others coming
scalability
Scalability

CDNs

  • Edge Cache SWFs

NIO Based Messaging

  • Thread per client does not scale
  • Working with JCP & Comet style push options like Tomcat 6

AMF!!!

security
Security

Flash Player uses the browser networking stack

  • JAAS
  • ACEGI

crossdomain.xml - BE VERY AFRAID!

<cross-domain-policy>

<allow-access-from domain="*"/>

</cross-domain-policy>

  • Never, ever, ever put a global policy file on an intranet site
  • Never, ever, ever put a global policy file on a site using cookie authentication
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