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I spent a lot of time creating and testing the Verlet motion code that we ve been using in the previous two chapters. Do I really want to rewrite all that code every time I have an object that uses Verlet integration Of course not. I would rather just write the code once, and then tell other classes to use it if they need it. This is the perfect opportunity to use an abstract class. In the chapter s source files, you ll find a folder called Circle. Run the SWF, and you ll see that it s a simple program that allows you to move a circle around the stage by using the arrow keys or clicking the stage with the mouse (see Figure 3-1).

Caching data can be useful in an application, especially when used to recall common lookup data often. Caching can provide the following benefits for an application: Improved application performance Improved scalability Reduced load on application and database servers A perfect example of this is caching lookup data for drop-down list boxes in the user interface. In this case, an application would retrieve the lookup data on the initial load of the user interface and store that within the user interface so that it can be reused on subsequent loads for that particular user s UI component. This would save unnecessary hits to the database for that data that rarely or never changes. When you cache data, you have to assess the data s volatility and determine how long you want to keep the cache around before expiring it and requiring the application to refresh the cache. Also, you must be aware of how much data is cached within a particular layer of the application, because caching can take up memory, and too much caching of data may unnecessarily take up too many resources from the running application. The use of caching must be balanced based on the amount of free local resources such as memory.

<data> <link id="redirect" href="/ajax/chap07/page2" /> </data> The returned XML content is processed by the inlined method request.complete. In the inlined method request.complete, the returned XML content is parsed by using the function XMLIterateElements. The function XMLIterateElements is a helper function used to process the returned XML content. Specifically, the function XMLIterateElements extracts the destination link from the returned XML content, which in the example happens to be the URL /ajax/ chap07/page2. In the inlined method, the extracted URL is assigned to the variable objData. redirectURL by the function XMLIterateElements. But before the extracted URL is reassigned, the state hash code is updated by calling the location.replace method. Then after the script replaces the URL, the script can navigate to the extracted URL by using the method location.href. A little side note needs to be added about the purpose of the returned XML. Figure 9-3 shows the problems when HTTP POST is used to navigate from HTML page to HTML page. As the State Navigation pattern navigates using the returned XML, the posting of the same content multiple times does not occur. Navigation occurs when using a script that uses HTTP GET techniques that are called after a successful posting. And the posting of the state twice is impossible because the state identifier is incremented for each posting. So if a resource is responsible for charging a credit card, posting the same content multiple times can be caught by the server and curtailed.

Figure 3-1. Click anywhere on the stage or use the arrow keys to move the circle. The circle is created using the CircleModel class and is displayed using the CircleView class. All the classes we ll be using in this chapter are in the com/friendsofed/gameElements/ primitives folder. The primitives folder contains classes that form the very basis of game design elements, and you can use them to build many different kinds of objects for your games. The CircleModel class extends another class called AVerletModel. AVerletModel contains all the essential methods and properties, like the venerable update method, that game objects need to use if they want to move around the stage using Verlet integration. It s an abstract class. If any other class wants to move around the stage, all it needs to do is extend AVerletModel. Let s take a detailed look at AVerletModel and how CircleModel extends it. AVerletModel forms the basis of any motion system you may want to build yourself, so it s an important reference for you to have at hand between the covers of this book.