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First is a product that is most like Dojo an open source DHTML toolkit that provides no server-side components: Prototype and scriptaculous Prototype is a very popular JavaScript toolkit for web development It is open source like Dojo and consists of a single JavaScript file containing functions and constructors However, most of the functionality of Prototype is unrelated to the user interfaceThat is why it is typical for Prototype to be used in combination with another JavaScript library called scriptaculous Together, they begin to achieve some of the breadth present in the Dojo toolkit However, a number of issues, such as the absence of a separate namespace for Prototype functions make it less desirable for enterprise development

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final Greet greet = GWTcreate(Greetclass); Windowalert(greetgenericHello() + " " + greetspecificQuery());

Next is a product that allows users to develop RIAs but is based on a client-side plugin: Adobe Integrated Runtime (AIR) This approach requires a runtime plugin to be installed on the browser, which is done the first time an Adobe Air application is runThis product can use its own programming language called ActiveScript, which is very similar to JavaScript Although an excellent programming environment, Adobe is a commercial vendor, and AIR can make use of proprietary components on the client (the runtime) and on the server, an approach that many open source developers disagree with

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Freeing resources is also an issue with managed code, especially if native code is involved Resources can be freed either by the garbage collector or by the programmer The dispose pattern deals with both variants For freeing resources by the garbage collector, you can implement a C# destructor The C# compiler generates a Finalize method that is overridden from the Object class This method is called by the garbage collector before the object is destroyed To make freeing resources possible by the programmer himself, the interface IDisposable, which defines the Dispose method, can be implemented Both the Dispose and the Finalize methods should release resources However, the work you can do in either method differs because if the programmer disposes the object himself, you can do a lot more compared to the work that should be done by the garbage collector With the garbage collector, the order of objects destroyed and the thread calling Finalize are not defined To deal with these issues, the dispose pattern defines a Dispose method with a Boolean argument, as follows: public class Resource : IDisposable { public Resource() { // allocate resource } ~Resource() { // this is called by the garbage collector Dispose(false); } public void Dispose() { // this is called by the programmer Dispose(true) } protected virtual void Dispose(bool disposing) { if (disposing) { // free embedded resources GCSuppressFinalize(this); } // embedded resources are freed by the garbage collector // don't access embedded references here } }

Finally, let s review a product that can also be used to develop RIAs but takes a completely different technical approach:

With the configuration tool, you can see object-pooling configuration values on the Activation tab of the component configuration, as shown in Figure 2-14

The first line uses deferred binding to create the appropriate class (depending on the locale of the browser) and the second line displays the required texts6 If you run this code without any further ado, you ll get a Hello there! How are you message If you want to test the other locales, you can either add a line such as

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Google Web Toolkit (GWT) This product provides a library of Java classes that can be used to construct RIAsThe developer writes custom Java classes using the GWT library and then uses a GWT program to create JavaScript from the Java codeYes, you read that correctly GWT treats the browser as a virtual machine for JavaScript As a developer you won t work with the JavaScript directly, only indirectly as JavaThis probably strikes you as a fairly unusual approach, and you may wonder if it can actually succeedWell, if any organization can make it succeed, Google probably can, given their enormous capabilities and resources It reminds me of the old joke, Where does an 800 pound gorilla sleep Anywhere it wants to!

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