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The handling of annotations in Java programs brings several changes to the AspectJ language. The changes concern the definition of an aspect, the pointcut-definition language, and the introduction of annotations. Annotations and Pointcut Definitions You learned in the previous sections that a pointcut can capture elements of a Java program, such as methods and fields, and link them together in order to aspectize them. In this process, the writing of a pointcut relies heavily on the elements that define a field or method, such as the name, type, or signature. It then seems natural to incorporate annotations for fields or methods in the writing of a pointcut. With AspectJ 5, the pattern language for a pointcut descriptor is extended with the at-sign symbol (@) followed by an annotation name. For instance, the following expression execution( @Transaction * *.*(..) ) designates all the joinpoints that are executions of a method annotated with @Transaction, regardless of the method s return type, declaring class, name, or signature.

As you can see, much like many other data-bound controls such as the ASP.NET DataList control, the ReorderList control has support for ItemTemplate, EditItemplate, and more, thereby allowing ample flexibility when dealing with lists of data. Figure 8-13 shows the sample page containing this code in the browser.

As you work with Venkman, you ll get a feel for the windows that you use most often. Close the windows you don t often use by clicking the X button on the right side of the window s title bar. You can reopen windows by selecting the View Show/Hide menu item. If at any time you want to return the window layout to the default setting, simply use /restore-layout factory at the command-line interface.

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Several annotations can be specified, in which case all of them are required for the element to be included in the pointcut The Boolean OR operator (||) can be used between annotations to signify that at least one of the annotations must be present For instance, @(Foo || Bar) means that either @Foo or @Bar is required as an annotation The Boolean NOT operator (!) is used in front of an annotation For instance, !@Foo means that all elements that are not annotated with @Foo are included in the definition Joinpoints can be filtered according to the annotations available to the source and target objects of a method call The @this and @target operators are defined for this purpose For instance, the following expression call( * **(.) ) && @target( @Transaction ) designates all the calls to a method that is annotated with @Transaction.

CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)

When Venkman is open, it recognizes all the JavaScript that is available to the page currently open in the browser window. Venkman recognizes JavaScript that is embedded within the HTML page using <script> tags and also recognizes external JavaScript files that are included in the HTML page using <script src="js_file.js"> tags. Venkman displays the currently available JavaScript in the Loaded Scripts window. Clicking the plus sign next to each file opens a list under the file that details all the available JavaScript functions within that file along with the line number at which the function occurs within the file and optionally the number of lines of code the function encompasses, as shown in Figure 7-11. Double-clicking a file within the Loaded Scripts window opens the file in the Source Code window and also scrolls directly to the function within the Source Code window. Right-clicking a file in the Loaded Scripts window displays a number of options for both the file itself and the JavaScript functions contained within the file, as shown in Figure 7-12. For the file, this pop-up menu allows you to performs tasks such as disabling the debugging of eval and timeout statements, disabling the debugging of contained functions, and disabling the performance monitoring of contained functions. For individual functions, the context menu provides facilities for disabling the debugging and performance profiling.

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