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Server-Side Swing for Rich Internet Applications
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03/15/2005, By Bernhard Wagner
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Applying the half-object design pattern is a promising approach to leverage J2SE in a J2EE architecture. Canoo’s UltraLightClient succeeds in providing a server-side API for the entire set of Swing widgets, with transparent and highly optimized client/server interaction. The benefit for development is that a number of difficult issues are resolved, including the split between client and server, communication, and most security concerns. A further impressive feature is that ULC based programs can be configured to run in any standard Java platform environment. The most formidable advantage, however, is the server-side architecture that fits seamlessly into existing web platforms. The result is that thin client web applications and platforms can profit from the rich GUI capabilities of Swing and the J2SE environment.
The limitations of ULC’s approach are reached when heavy processing is needed on the client side. Productivity applications like sophisticated visual editors are an example. For such applications, splitting the presentation layer by means of the half-object pattern is a bad idea, because this will introduce a lot of complexity. The proper domain for the half-object pattern and ULC is the typical client/server business application running in the Intranet or Internet. For these latter scenarios, ULC is an effective way to leverage the GUI capabilities of J2SE without giving up the advantages of HTML-based web applications.
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