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With the ASP.NET 2.0 AJAX Extensions, the process of developing an AJAX application is similar to what is done today to build an ASP.NET web forms application. Server controls generate the HTML UI as well as the JavaScript functionality, and the AJAX-enabled pages run within the browser by leveraging the AJAX Library. The result is rich client-side functionality within the browser. These server controls can also connect directly to ASP.NET Web Services using JavaScript service proxies to provide a richer experience on the client. This architecture allows for increased productivity because server controls generate much of the code, which enables you to write fewer lines of JavaScript code. It allows for the clean separation of content, style, behavior, and application logic. A typical design pattern of an ASP.NET AJAX application involves it consuming web services directly from the client without requiring postbacks to the web server. Not only do postbacks slow down an application, but they also complicate the application design, implementation, and deployment. In fact, if you don t use the AJAX functionalities, you have to post the page back to the server (for example, because the user clicks the button where you have inserted the code to call the Web Service method). The page is loaded again and then the button click event handler is called. In the event handler code, there is the creation of the object from the proxy class referenced to the web service. When the method is called, another HTTP request is accomplished. When using AJAX, just the last operation is done, and a lot of time and TCP traffic is saved.

As you can see, Ajax creates a whole new set of opportunities for Web application development. No longer are you hindered by proprietary techniques and disappointing compromises. With Ajax, the line between thick and thin is blurred, and the real winners are your users!

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// all the field set operations on all the fields (*) of class C pointcut dataModification(): set(C.*) Method-calls pointcut: This type of pointcut designates all the calls to a set of methods. Such a pointcut can be used to compute a message-sequence chart, for example. Here is an example of a method-calls pointcut: // all the calls to the methods of C returning void // and taking any parameters (..) pointcut calls(): call(void C.*(..)) Method-executions pointcut: This type of pointcut designates all the executions of a set of methods. Such a pointcut can be used to compute method-execution times, for example. Here is an example of a method-executions pointcut: // all the executions of the methods of C returning any type (*) // and taking any parameters (..) pointcut executions(): execution(void A.*(..))

The AJAX Library provides a powerful JavaScript programming model with a rich type system. JavaScript supports the basic concept of classes but doesn t offer many of the constructs needed for OO programming, nor does it provide a robust type system. To allow developers to create more readable and maintainable code, the AJAX Library extends JavaScript to support namespaces, classes, interfaces, inheritance, and other artifacts that are usually associated with modern high-level languages such as C# and Java. The AJAX Library also includes a Base Class Library with helper classes that provides additional functionality to JavaScript, such as extended error handling, debugging, and tracing. In the next version of Visual Studio (code named Orcas), Microsoft will be adding support for JavaScript developers such as doc comments, Intellisense, and debugging. The AJAX Library incorporates some of the functionality that will be needed to support this functionality. One of the important aspects of ASP.NET is that it provides a mechanism for developers to globalize (i.e., date formats, etc.) and localize (i.e., string translations) their web applications to support different languages based on the user s browser setting. The AJAX Library also provides this mechanism. Globalization is supported through the Base Class Library s Sys.CultureInfo class and the localFormat method on the number, date, and string types. Localization is supported through a combination of the Sys.CultureInfo

31 private void checkAccountArgs(BigDecimal amount,String descr, String accountId) 32 throws InvalidParameterException, AccountNotFoundException { 33 if (descr == null) 34 throw new InvalidParameterException("null description"); 35 if (accountId == null) 36 throw new InvalidParameterException("null accountId"); 37 if (amount.compareTo(bigZero) != 1) 38 throw new InvalidParameterException("amount <= 0"); 39 } In the preceding code, we can see the different tests implementing the preconditions (lines 8, 17, and 20). In this case, the preconditions can be split into two parts: The part that checks the consistency of the parameters, implemented in checkAccountArgs (line 8). This is the parameter precondition part. The part that is more business-related and that checks that the type of account allows the current withdrawal operation (line 17) and that the balance is high enough to perform the withdrawal (line 20). This is the business precondition part.

Summary

Now that you have some ideas on where to use Ajax, we ll take a minute to cover some design considerations for applying Ajax Many of these principles are no different from what you would normally do in a Web application, but they still bear mentioning Strive to minimize the traffic between the client and server Applied well, Ajax will make your application more responsive, but if you are trying to send an encyclopedia s worth of data back and forth every time your user navigates off a field, your users will not be amused When in doubt, follow standard conventions If most applications do XYZ, then you probably should too When in doubt, look at the standards for Web desktop applications Some patterns have been established, and more are sure to follow (wwwajaxpatternsorg).

The following sections describe the use of AOP to implement the two precondition types previously encountered.

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