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So here we are: clients want a more full-featured application, and developers want to avoid deploying executables to thousands of workstations We ve tried a number of alternatives, but none has been the panacea it was touted as However, recent developments have added an incredibly powerful tool to our design kit Today we have another option, another tool, to create truly rich browser-based applications Today we have Ajax Ajax is more of a technique than it is a specific technology, though the aforementioned JavaScript is a primary component We know you re saying, JavaScript is not worth it, but with the resurgent interest in the language because of Ajax, application and testing frameworks, combined with better tool support, are easing the burden on developers With the introduction of Atlas, Microsoft is throwing its weight firmly behind Ajax, while the infamous Rails Web framework comes prebuilt with outstanding Ajax support.

So much for history. Let s roll up our sleeves and get covered in electrons up to our elbows by getting to know the interface for ActionScript: the Actions panel.

addItem method. The new version is more generic and intercepts the calls to all the methods defined in the Order class. The code of the TraceAspect2 aspect is shown in Listing 3-7. Listing 3-7. Using Wildcards in Pointcut Descriptors 1 package aop.aspectj; 2 3 public aspect TraceAspect2 { 4 5 pointcut toBeTraced(): call(* aop.aspectj.Order.*(..)); 6 7 Object around(): toBeTraced() { 8 System.out.println("-> Before the call"); 9 Object ret = proceed(); 10 System.out.println("<- After the call"); 11 return ret; 12 } 13 } The first difference between the TraceAspect and TraceAspect2 aspects is in the definition of the pointcut. (See line 5 in Listing 3-7). The pointcut descriptor is now call(* aop.aspectj. Order.*(..)). All the calls to the methods defined in the Order class are intercepted by the pointcut whatever the methods parameters and return types are. A second difference can be found in the return type of the advice code block. Previously, the type was void. Now, the pointcut intercepts either a method that returns void (for example, addItem) or a method that returns double (for example, computeAmount). Strictly speaking, no common supertype exists for both void and double. As a convention, AspectJ considers that Object (see line 7 in Listing 3-7) is the common supertype for all Java primitive and object types. The result of proceed is stored in the ret variable (see line 9), which is returned at the end of the advice code block (see line 11).

To create a column of text with ActionScript, follow these steps:

2. Click once in the Script pane, and enter the following:

var myDummyText:String = "The introduction of the Adobe CS5 product line puts some powerful typographic tools in your hands notably, a new API (Application Programming Interface) called Type Layout Framework (TLF) and with as more tools in the Adobe line up nudge closer to a confluence point with Flash, the field of typographic motion graphics on the Web is about to move into territory that has yet to be explored. To start that exploration, you need understand what type is in Flash and, just as importantly, what you can do with it to honor the communication messengers of your content."; You need some text to add to the stage. This string is the third paragraph of this chapter.

In the previous section, you learned that wildcards can be used to write generic pointcut descriptors. With wildcards, a pointcut can be associated with several methods. You will see in this section how to obtain some information about a joinpoint at run time. This is known as the joinpoint-introspection mechanism. The term introspection refers to examining the inner cause of a given phenomenon and gaining information about it. In the context of AOP, the phenomenon is the joinpoint, and you want to retrieve information about the part of the actual program that allows the joinpoint to occur. A comparison can be made with the Java java.lang.reflect API that provides, for any given Java program, a description of the program s classes, fields, and methods. The program is then said to have introspected to obtain information about itself. In the context of AOP, the same principle applies. The joinpoint examines itself to gain information about itself. This mechanism is useful for determining, for instance, the method call that caused the joinpoint to occur.

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