September 2008
Intermediate to advanced
660 pages
20h 32m
English
Content preview from Programming Flex 3Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Differences Between Traditional and Flex Web Applications
Many applications deployed on the Web use HTML as the user interface. Flex applications are similar in many respects, but they have distinct differences. If you’re used to building applications that use an HTML UI, it’s important to take a few moments to shift how you approach building applications when you start working with Flex. What works for HTML-based applications may or may not work for Flex applications.
Both traditional and Flex applications are generally n-tiered. The exact number and types of tiers an application has depend on many factors. Most traditional applications have, at a minimum, a data tier, a business tier, and a presentation tier. Flex applications have a data tier and a business tier; however, as noted earlier, they also introduce a client tier, which is what strongly differentiates them from traditional web applications. The client tier of Flex applications enables clients to offload computation from the server, freeing up network latency and making for responsive and highly interactive user interfaces.
Data tiers generally consist of databases or similar resources. Business tiers consist of the core application business logic. As an example, a business tier may accept requests from a client or presentation tier, query the data tier, and return the requested data.
In traditional applications, the presentation tier consists of HTML, CSS, JavaScript, JSP, ASP, PHP, or similar documents. Typically ...
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