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Flex architectural patterns

This concise guide explores essential Flex architectural patterns, focusing on encapsulation, modularity, and the MVC model. Delve into leveraging Adobe's Flex framework to create efficient applications with reusable components, optimized runtime performance, and effective caching strategies. Learn how to manage business logic in AIR applications, implement automated testing frameworks, and ensure security with cross-domain policies. Perfect for developers looking to enhance their Flex skills, reduce application size, and improve scalability in web projects.

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Flex architectural patterns

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  1. Flex architectural patterns James Ward Technical Evangelist jaward@adobe.com www.jamesward.com

  2. 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

  3. 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

  4. 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

  5. Performance Item Renderers • KEEP THEM SIMPLE! Objects • Typed objects are optimized in the JIT • AMF!!! Modules / Deferred Instantiation • Do things later...

  6. 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

  7. MVC / Service Bus Model Component View Service Controller Component

  8. Testing Unit Testing • Flex Unit • Many others Automated Testing • Mercury QTP • SilkTest • Others coming

  9. 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!!!

  10. 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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