MACROMEDIA FLASH REMOTING MX-USING FLASH REMOTING FOR FLASH MX 2004 ACTIONSCRIPT 2.0 Spezifikationen PDF herunterladen (Seite 38)

This is the Title of the Book, eMatter Edition

Chapter 1: Introduction to Flash Remoting

entirely on the client side, as the UI can be created dynamically at runtime on the cli-

ent’s machine. Furthermore, once the UI has been created or downloaded, only the

updated data has to be sent back and forth to the server. This differs from dynami-

cally generated HTML, which requires that the entire page be recreated on the server

and served to the client each time the data or state of the application changes.

There are other advantages of using an n-tiered architecture with the Flash Player as

the presentation layer. By abstracting the presentation layer away from the data

source, you can completely change the data source or its format without affecting the

interface or rewriting your Flash movie.

Changes to the data tier affect only the middle tier. Assuming that the API exposed

by the middle tier to the presentation level does not change, the Flash movie will not

be affected at all.

For example, the application’s data source can be changed without affecting the

Flash movie, as shown in Figure 1-10. Furthermore, because the middle tier might

comprise multiple levels, only the middle tier’s interface to the data tier needs to be

adjusted.

By having multiple tiers, each tier can be optimized for its particular task and envi-

ronment. This is particularly important when using Flash as the presentation layer,

Figure 1-10. N-tiered architecture with data abstraction layer

Client

Server

Flash Player

Presentation

tier

Middle

tier

AMF

Flash Remoting

adapter

Core business

logic

Data abstraction

layer

XMLDatabase Other data

source

Data

tier

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MACROMEDIA FLASH REMOTING MX-USING FLASH REMOTING FOR FLASH MX 2004 ACTIONSCRIPT 2.0 Spezifikationen Seite 38