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No technology book is complete these days without at least a casual mention of patterns. As we ve said before, Ajax is quite new, so the area has a lot of churn. Also, your knowledge will certainly grow as more and more Web sites take advantage of all Ajax has to offer. Still, we ll touch on a few basic patterns in the following sections. For a more complete list of patterns, point your browser to ajaxpatterns.org. Ajax Patterns and Best Practices by Christian Gross (Apress, 2006) also outlines the various patterns which you'll need to quickly write appliations that work.

The application name The main class name A series of three values for defining the aspect identifiers, the aspect-configuration files, and the Boolean values that specify whether the aspects are initially woven A series of two values for defining the aspect identifiers and the classes that implement those aspects The weaving order when several wrappers apply to the same joinpoint For distributed applications, the names of the hosts where the application is deployed

If you look at an HTTP trace (using any HTTP tracing utility) of what is happening as you run this application, you ll see the following. (Much of this has been removed for brevity.) Take note that the VE service implements the mapping functionality, returning the correct map tiles upon requests from this client library. First the browser issues the initial request to a page:

Implementing the Fade Anything Technique (FAT)

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You can extend the structure of an application by using the introduction feature to add new code elements. JAC can introduce, or add, two categories of these elements: role methods and exception handlers.

#1 10:34:27.328 127.0.0.1:4611 GET /chapter9/Default.aspx HTTP/1.1 Accept: */* Accept-Language: en-us Accept-Encoding: gzip, deflate Connection: Keep-Alive

You introduce a role method to define new behaviors. A role method is defined in a wrapper class. You can choose the name, signature, and return type of the method. However, the first parameter must be org.objectweb.jac.core.Wrappee. This parameter corresponds to the application object where the method will be introduced. The wrapper shown in Listing 4-9 illustrates the definition of a role method. Listing 4-9. The Definition of a Role Method package aop.jac; import import import import import org.aopalliance.intercept.ConstructorInvocation; org.aopalliance.intercept.MethodInvocation; org.objectweb.jac.core.AspectComponent; org.objectweb.jac.core.Wrappee; org.objectweb.jac.core.Wrapper;

One of the really slick things about Ajax is that you can modify just part of a Web page. Rather than repaint the entire view, you can update just the part that changes. While this is a handy technique, it may confuse users who are expecting a full-page refresh. With this in mind, 37signals used the Yellow Fade Technique (YFT) in its flagship Basecamp product as a way of subtly indicating to the user what had changed. YFT does just what it suggests: the part of the page that changed is repainted in yellow, and it slowly fades back to the original background color. The Fade Anything Technique (FAT) pattern is similar in nature. In essence, the only real change is the color you use to fade; after all, yellow might not be the best option for you. Implementing this technique is not terribly difficult; you can find sample code using your favorite search engine. For an example of this pattern, see Figure 8-1. The new stories are highlighted in gray, which allows users to easily identify the freshest material.

Then the server responds with this:

public class TraceWrapper4 extends Wrapper { public TraceWrapper4(AspectComponent ac) { super(ac); } public void computeAmountAndPrint( Wrappee o, String header ) { double amount = ((Order)o).computeAmount(); System.out.println(header+amount); } public Object construct(ConstructorInvocation ci) throws Throwable { return proceed(ci); } public Object invoke(MethodInvocation mi) throws Throwable { return proceed(mi); } } The computeAmountAndPrint method can be introduced in the Order class to compute and print the amount of an order. The first parameter, o, is the instance of the Order class where the role method is invoked. The second parameter, header, is a string that is printed before the amount. A role method can be called by the invokeRoleMethod method, which is defined in the org.objectweb.jac.core.Wrappee class. This method takes three parameters: the instance that receives the call, the name of the role method, and the array of objects to pass as parameters to the method. For example, the code block Wrapping.invokeRoleMethod( (Wrappee)o, "computeAmountAndPrint", new Object[]{">> "});

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