What is Flex
Adobe Flex is a software development kit (SDK) released by Adobe Systems for the development and deployment of cross-platform rich Internet applications based on the Adobe Flash platform. Flex applications can be written using Adobe Flash Builder or by using the freely available Flex compiler from Adobe.
The release in March 2004 by Macromedia included an SDK, an Integrated development environment (IDE), and a Java EE integration application known as Flex Data Services. Since Adobe purchased Macromedia in 2005, subsequent releases of Flex no longer require a license for Flex Data Services, which has become a separate product rebranded as LiveCycle Data Services. An alternative to Adobe LiveCycle Data Services is BlazeDS, an open-source project that started with code contributed in 2007 by Adobe.
In February 2008, Adobe released the Flex 3 SDK under the open source Mozilla Public License and so Flex applications can be developed using any standard IDE, for example Eclipse.
Overview
Traditional application programmers found it challenging to adapt to the animation metaphor upon which the Flash Platform was originally designed. Flex seeks to minimize this problem by providing a workflow and programming model that is familiar to these developers. MXML, an XML-based markup language, offers a way to build and lay out graphic user interfaces. Interactivity is achieved through the use of ActionScript, the core language of Flash Player that is based on the ECMAScript standard. The Flex SDK comes with a set of user interface components including buttons, list boxes, trees, data grids, several text controls, and various layout containers. Charts and graphs are available as an add-on. Other features like web services, drag and drop, modal dialogs, animation effects, application states, form validation, and other interactions round out the application framework.
In a multitiered model, Flex applications serve as the presentation tier. Unlike page-based HTML applications, Flex applications provide a stateful client where significant changes to the view don't require loading a new page. Similarly, Flex and Flash Player provide many useful ways to send and load data to and from server-side components without requiring the client to reload the view. Though this functionality offered advantages over HTML and JavaScript development in the past, the increased support for XMLHttpRequest in major browsers has made asynchronous data loading a common practice in HTML-based development as well.
Technologies that are commonly compared to Flex include Curl, OpenLaszlo, Ajax, XUL, JavaFX, Windows Presentation Foundation and Silverlight.
Application Development Process
· 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
Versions
Macromedia Flex Server 1.0 and 1.5
Macromedia targeted the enterprise application development market with its initial releases of Flex 1.0 and 1.5. The company offered the technology at a price around US$15000 per CPU. Required for deployment, the Java EE application server compiled MXML and ActionScript on-the-fly into Flash applications (binary SWF files). Each server license included 5 licenses for the Flex Builder IDE.
Adobe Flex 2
Adobe significantly changed the licensing model for the Flex product line with the release of Flex 2. The core Flex 2 SDK, consisting of the command-line compilers and the complete class library of user interface components and utilities, was made available as a free download. Complete Flex applications can be built and deployed with only the Flex 2 SDK, which contains no limitations or restrictions compared to the same SDK included with the Flex Builder IDE.Adobe based the new version of Flex Builder on the open source Eclipse platform. The company released two versions of Flex Builder 2, Standard and Professional. The Professional version includes the Flex Charting Components library.
Enterprise-oriented services remain available through Flex Data Services 2. This server component provides data synchronization, data push, publish-subscribe and automated testing. Unlike Flex 1.0 and 1.5, Flex Data Services is not required for the deployment of Flex applications.
Coinciding with the release of Flex 2, Adobe introduced a new version of the ActionScript programming language, known as Actionscript 3, reflecting the latest ECMAScript specification. The use of ActionScript 3 and Flex 2 requires version 9 or later of the Flash Player runtime. Flash Player 9 incorporated a new and more robust virtual machine for running the new ActionScript 3.
Flex was the first Macromedia product to be re-branded under the Adobe name.
Adobe Flex 3
On April 26, 2007 Adobe announced their intent to release the Flex 3 SDK (which excludes the Flex Builder IDE and the LiveCycle Data Services) under the terms of the Mozilla Public License.Adobe released the first beta of Flex 3, codenamed Moxie, in June 2007. Major enhancements include integration with the new versions of Adobe's Creative Suite products, support for AIR (Adobe's new desktop application runtime), and the addition of profiling and refactoring tools to the Flex Builder IDE.
- In October 2007, Adobe released the second beta of Flex 3.
- On December 12, 2007, Adobe released the third beta of Flex 3.
- On February 25, 2008, Adobe released Flex 3 and Adobe AIR 1.0.
- On December 15th, 2009, Adobe released version 3.5 of the Flex SDK.
Adobe Flash Builder and Flex 4
Adobe released Flex 4.0 (code named Gumbo) on March 22, 2010.The Flex 4 development environment is called Adobe Flash Builder,formerly known as Adobe Flex Builder.
Some themes that have been mentioned by Adobe and have been incorporated into Flex 4 are as follows:
- Design in Mind: The framework has been designed for continuous collaboration between designers and developers.
- Accelerated Development: Be able to take application development from conception to reality quickly.
- Horizontal Platform Improvements: Compiler performance, language enhancements, BiDirectional components, enhanced text (Flex 4 includes the new Text Layout Framework).
- Full Support for Adobe Flash Player 10 and above.
- Broadening Horizons: Finding ways to make a framework lighter, supporting more deployment runtimes, runtime MXML.
- Simpler skinning than the previous versions.
- Integration with Adobe Flash Catalyst.
- Custom templates
- Testing tools
- Memory and performance profilers
- An automated testing harness to connect to all the leading testing tools
- FlexUnit support
- command-line build capability
- The new Network Monitor
Related tools
Adobe Flash Catalyst
On October 2, 2007, Adobe announced a new design tool related to flex codenamed Adobe Thermo. On November 17, 2008 Adobe announced the official name of the product would be Adobe Flash Catalyst.
Flex and ColdFusion
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.
Flash Builder for Education
Since 2008, Adobe has made Flash Builder and ColdFusion available to all educational customers for free on their website.
Application Frameworks
There are a number of application frameworks available which help the developer solve some common tasks and set up the application structure according to best practices. Thanks & Regards,
"Remember Me When You Raise Your Hand For Dua"
Raheel Ahmed Khan
System Engineer
send2raheel@engineer.com
sirraheel@gmail.com
http://raheel-mydreamz.blogspot.com/
http://raheeldreamz.wordpress.com/
"Remember Me When You Raise Your Hand For Dua"
Raheel Ahmed Khan
System Engineer
send2raheel@engineer.com
sirraheel@gmail.com
http://raheel-mydreamz.blogspot.com/
http://raheeldreamz.wordpress.com/
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