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The declare soft keyword combination is provided to implement this introduction mechanism. A type and a pointcut descriptor must be provided. The type designates the type of exceptions to be caught, and the pointcut descriptor designates the joinpoints where the exceptions are to be caught. For instance, the following line of code declare soft: IOException+: call( * InputStream.*(..) ) declares that the subclasses of a certain exception the IOException exception that is thrown when a method defined in the InputStream class is called must be wrapped in the org. aspectj.lang.SoftException exception.

<ajaxToolkit:Rating ID="ThaiRating" runat="server" CurrentRating="2" MaxRating="5" StarCssClass="ratingStar" WaitingStarCssClass="savedRatingStar" FilledStarCssClass="filledRatingStar" EmptyStarCssClass="emptyRatingStar" OnChanged="ThaiRating_Changed" style="float: left;" />

The previous sections introduced the many features offered by AspectJ for programming aspects. As with other languages, advanced functionalities apart from the mainstream features that complement the language exist. In AspectJ, these are the concepts of the abstract aspect, aspect inheritance, aspect instantiation, aspect ordering, and the privileged aspect.

The last two items in Figure 7-4 are informational warnings. These are instances in which something is technically not correct but from which Firefox can still recover. The first informational message describes a style sheet whose MIME type was sent as text/plain instead of text/ css as it should be. You can correct this error by ensuring that the server supplying the page

The ThaiRating_Changed method simulates logic processing by 400ms of pause and notifies the user as shown in the following code:

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The aim of the abstract aspect in AspectJ is to define an aspect that has some undefined elements (pointcuts or methods). These elements are then said to be abstract. This concept is similar to that of an abstract class. The precise definition of these elements will be given in a subaspect. Abstract aspects allow you to factor definitions that are shared by several aspects. As with abstract classes, abstract aspects cannot be instantiated. The abstract keyword is used to define abstract aspects. It can be written before the aspect or pointcut keyword (for defining pointcut descriptors) and before the method that is abstract in the aspect. The following section illustrates the precise definition of an abstract aspect.

correctly sets the MIME type for CSS files to text/plain. The message shown in Figure 7-4 hints to the developer that the W3C standard of referencing an object should be used instead of a proprietary method.

protected void ThaiRating_Changed(object sender, RatingEventArgs e) { Thread.Sleep(400); e.CallbackResult = "Update done. Value = " + e.Value + " Tag = " + e.Tag; }

Inheritance can be used with aspects like it is used with classes. The goal is to extend an aspect without rewriting it completely. Only single inheritance is supported. As with classes, the extends keyword provides the inheritance feature. In the following line of code, the TraceAspect2 aspect extends the TraceAspect aspect: public aspect TraceApect2 extends TraceAspect { ... } However, aspect inheritance does not follow the same exact rules as class inheritance. An aspect can extend only abstract aspects, whereas a class can extend both abstract and nonabstract classes. A pointcut can be redefined in a subaspect. If a pointcut is redefined, the redefined version will always be used. Pointcut redefinition with aspect inheritance follows the same rules as method redefinition with class inheritance.

The Microsoft Script Debugger1 is an extension to Internet Explorer 4 (or greater) that can be used to debug both client-side scripts and server-side scripts running on Microsoft IIS. In this section, we ll focus on its client-side debugging abilities. Installing Script Debugger is as easy as downloading and running the installation program. Once that is complete, you need to ensure that Internet Explorer has debugging enabled. To do so, open the Internet Options window available via the Tools Internet Options menu. On the Advanced tab, under the Browsing submenu, ensure that the Disable Script Debugging item is unchecked, as shown in Figure 7-5.

Beyond these basic properties, there are a few CSS-based properties such as WaitingStarCssClass and FilledStarCssClass for various states of the control. In addition to that, in the OnChanged event, you can specify a server-side method to implement more custom logic. You can see an example running on the browser in Figure 8-12.

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