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Adobe Flex is an umbrella term for a group of technologies initially released in March of 2004 by Macromedia to support the development and deployment of rich Internet applications based on their proprietary Macromedia Flash platform.

Contents 1 Overview 2 Initial Releases (Flex Server 1.0 and 1.5) 3 Adobe Flex 2 4 Flex Data Services 5 Flex and ColdFusion 6 Flex Application Development Process 7 Release history 8 See also 9 Technical Mailing Lists 10 External links

Traditional application programmers found it challenging to adapt to the animation metaphor upon which the Flash Platform was originally built. Flex seeks to minimize this problem by providing a workflow and programming model that is familiar to application developers.

Flex was initially released as a J2EE application or JSP tag library that compiles MXML and ActionScript on-the-fly into Flash applications (binary SWF files). Later versions of Flex support the creation of static files that are compiled at authoring time and can be deployed online without the need for a server license.

The goal of Flex is to allow Web application developers to quickly and easily build rich Internet applications. In a multi-tiered model, Flex applications serve as the presentation tier.

Flex features development of graphic user interfaces using an XML-based language called MXML. Flex comes with various components and features that make capabilities such as web services, remote objects, drag and drop, sortable columns, charting/graphing, built in animation effects, and other interface interactions simple. Since the client only loads once, application workflow is significantly improved versus HTML based applications (eg. PHP, ASP, JSP, CFMX) which require executing templates on the server with every action. Flex's language and file structure are seeking to decouple application logic from design.

The Flex server also acts as a gateway to allow the client to communicate with XML Web Services and Remote Objects (such as Coldfusion CFCs, Java Classes, and anything else that supports the Action Message Format).

Commonly mentioned as alternatives to Flex are OpenLaszlo, Ajax and Windows Presentation Foundation technologies.

Initial releases of Flex were targeted towards the enterprise application development market, and were priced around US$15000 per CPU. Each license included 5 Flex Builder licenses.

Flex 2 changes the licensing model to open room to a free version of the technology, called "Flex 2 SDK".

The new Flex Builder 2 is based on the Eclipse IDE. Enterprise-oriented services are available through Flex Data Services 2 providing data synchronization, data push, publish-subscribe and automated testing.

Flex 2 introduces the use of a new version of the ActionScript scripting language, Actionscript 3, reflecting the latest ECMAScript specification and requires Flash Player 9 or later for the runtime.

Flex is the first Macromedia product to be rebranded as Adobe.

Flex Data Services (FDS) is a server-side complement to the main Flex SDK and Flex Builder IDE. Deployed as a Java EE application, it adds the following capabilities to Flex applications:

• proxying HTTP requests, as a workaround to the Flash Player sandbox security restrictions
• supports the "publish" end of the "publish/subscribe" design pattern: the Flash client can subscribe to events broadcasted from FDS
• dynamic MXML/Actionscript compilation. This is similar to the way previous version of Flex applications were deployed

Adobe provides a free version of FDS which is limited to a single CPU, and doesn't support clustering. The full version costs $6,000 USD per CPU (limited to 100 concurrent users) or $20,000 USD per CPU (no limit). [1]

Flex 2 offers special integration with ColdFusion MX 7. The ColdFusion MX 7.0.2 release adds updated Flash Remoting to support ActionScript 3, a Flex Data Services event gateway, and the Flex Data Services assembler. Flex Builder 2 also adds extensions for ColdFusion providing a set of wizards for RAD Flex development. A subset of Flex 1.5 is also embedded into ColdFusion MX 7 middleware platform, for use in the ColdFusion Flash forms feature. It is possible to use this framework to write rich internet applications, although its intended purpose is for rich forms only.

Everything below is directly sourced from the help file in version 2.0 Beta 3:

• Define an application interface using a set of pre-defined components (forms, buttons, and so on)
• Arrange components into a user interface design
• Use styles and themes to define the visual design
• Add dynamic behavior (one part of the application interacting with another, for example)
• Define and connect to data services as needed
• Build the source code into a SWF file that runs in the Flash Player

• Flex 1.0 - March 2004
• Flex 1.5 - October 2004
• Flex 2.0 (Alpha) - October 2005
• Flex 2.0 Beta 1 - February 2006
• Flex 2.0 Beta 2 - March 2006
• Flex 2.0 Beta 3 - May 2006
• Flex 2.0 FINAL - June 28, 2006
• Flex 2.0.1 - January 5, 2007

• http://www.graniteds.org/ --- open source Flex Data Services
• XUL
• Thin client
• XAML
• Flash Player
• OpenLaszlo
• Nexaweb
• MXML
• Adobe Apollo
• http://osflash.org/red5 - Red5 is an open source Flash server (audio/video streams, remoting, etc.)

• Flexcoders - Flex Developer Mailing List
• Flexcomponents - Flex Component Development Mailing List
• ColdFusion Flex List at House of Fusion.

• Official Adobe Flex site
• Flex documentation
• Flex.org - Flex Community technical and support resource