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In the previous section, you learned how to define a pointcut with JAC. In this section, you will learn how to write wrappers. Programming an aspect with JAC consists of writing at least two classes: one (such as TraceAspect2) for the definition of pointcuts, and one for each wrapper associated with a pointcut. This allows you to easily reuse pointcut definitions independently from wrappers and vice versa. Wrapper classes with JAC must extend the org.objectweb.jac.core.Wrapper class, which is the root class of all existing wrappers. All wrappers are around wrappers. Wrapper instances are created either by JAC or by you when you define the pointcuts. In all cases, a link is maintained between the aspect and the wrapper instances. This link comes into existence when a wrapper is instantiated; the wrapper provides a constructor that takes the instance of the associated aspect as a parameter. This parameter implements the org.objectweb.jac.core.AspectComponent type, which is the root class of all JAC aspects. A typical definition of a wrapper class starts with the following lines of code: import org.objectweb.jac.core.AspectComponent; import org.objectweb.jac.core.Wrapper; public class MyWrapper extends Wrapper { public MyWrapper(AspectComponent ac) { super(ac); } With JAC, two types of joinpoints exist: method executions and constructor executions. The before and after code that is executed around these joinpoints is defined in the invoke and construct methods, which are presented in the following sections.

VE is an entirely hosted online application and as such doesn t require any extra component on the client to function properly. External script inclusion on top of your page is all that is needed to open the doors to the rich functionality of VE. One exception to this fact is the use of 3D maps. 3D maps are implemented via an ActiveX plug-in that needs to be

Figure 7-25. The XMLHttpRequest object immediately following object creation (left) and immediately following a successful request (right)

The code that is executed before and after a method-execution joinpoint is defined in the invoke method. This method takes a unique parameter that implements the MethodInvocation type, returns an Object, and throws the Throwable type. The definition of MethodInvocation is detailed in the Joinpoint Introspection section later in this chapter. The declaration of the invoke method is shown here:

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installed on Internet Explorer before you can view any of the 3D maps/landscapes. If the plug-in is not installed when the user attempts to switch the map mode to 3D, the user will be prompted to download it. With that in mind, let s take a look at what is involved in incorporating a basic map in your page and explore some of the key API features of the VE SDK.

public Object invoke( MethodInvocation mi ) throws Throwable; The proceed method can be called by the invoke method to execute the intercepted method. Several aspects can be woven around the same joinpoint. In such a case, a chain of wrappers is created around the joinpoint. The proceed method executes the next wrapper in the chain or, if the end of the chain is reached, the intercepted method. The proceed method can be called several times in the same invoke method. In such a case, several executions of the same method are performed. This can be useful when you need to rerun a method that previously failed. On the other hand, the proceed method might never be called. In such a case, the intercepted method is not executed, and the call is returned to the caller. The general format of the invoke method is shown in Listing 4-7. Listing 4-7. The General Format of the invoke Method public Object invoke( MethodInvocation mi ) throws Throwable { // before code Object ret = proceed(mi); // after code return ret; } The invoke method is mandatory even if no code is defined.

This example works well for the XMLHttpRequest object, which is well documented, but how about something that s not particularly well documented or the documentation is not easily accessible Consider a table row DOM object. We ve mentioned that all DOM elements have properties such as firstChild, but what else is there You can use Venkman and the Local Variables window to take a look. Figure 7-26 shows the Local Variables window and some of the properties available on a table row object. Did you know that it has properties named offsetHeight, offsetLeft, parentNode, and previousSibling If so, congratulations. If not, now you know and you may be able to put that knowledge to good use later. You may not know the meaning of all these properties, but if you know they exist and know their names, you can perform a Web search to learn more about them.

As mentioned earlier, all that s needed to include support for VE maps in your page is the inclusion of an external script file that is hosted on Microsoft servers. VE maps are intrinsically AJAX enabled, meaning that no extra effort is required at your end. By simply including the VEMap control in your page, users get the full AJAX experience and are able to view and move the map around and change various viewing options without any page refresh. At the time of this writing, the current version of the VE SDK is 5.0 and can be referenced in your page by adding the following line to the top of the page:

Like method executions, constructor executions can be aspectized with the construct method. The signature of this method is as follows: public Object construct( ConstructorInvocation ci ) throws Throwable; The proceed method plays the same role for construct as for invoke. No particular characteristics distinguish invoke from construct, except the difference in their names.

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