.NET/Java PDF, Tiff, Barcode SDK Library

In this chapter, you created a simple but complete TPS game. There s a lot of room for you to add more features to this game. For example, you could add more sophisticated enemy movement, more realistic movement animations, and enemy AI. However, the game is functionally complete. We ve shown you an underlying structure on which you can build. You began by creating a basic design for your game, divided into the game definition, game play, and technical design parts. After that, you started to develop the game code, which was divided into three main namespaces: GameBase, GameLogic, and Helpers. In the GameBase namespace, you added all the classes for the game engine, some of which you created in the previous chapters. Then you created all the helper classes in the Helpers namespace and all the game logic classes in the GameLogic namespace. After that, you created a LevelCreator class to create your game levels, and finally, you put it all together by creating a GameScreen class that handles the main game update and drawing logic.

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For our web application, the first mechanism we are concerned with is restricting access to particular URLs to the various groups of users. Consider the following group of URLs, for example: http://example.com/timesheets/login http://example.com/timesheets/home http://example.com/timesheets/admin All users must have access to the login page. Otherwise, nobody could establish credentials with the site. All logged-in users should have access to their home pages, but anonymous users must not. And only logged-in administrator users should have access to the administrator pages. In principle, we could apply these security rules in the controller classes, but then we would have to implement them in every controller, and could not reuse controller classes in contexts where different security rules applied. Similarly, we could apply the security rules to the servlets, but a web application may have multiple servlets, and there is a good chance that we will want to incorporate some servlets that are unaware of the Spring environment into an application, yet we would like these to be secured by the same rules. Fortunately, Java EE provides an ideal tool for managing security in web requests: the filter. Filters have the ideal life cycle; they allow us to intercept incoming web requests, permit them to proceed or prevent them from proceeding, and to do the same to outgoing web requests, manipulating responses and forcing redirects and forwards to other pages.

f you ve reached this page, you ve probably read the entire book, and may be wondering what the next steps are. What should you do to sharpen your XNA knowledge further to create the next generation of games That s the purpose of this final chapter: to give you some insights and tips on where to go from here. Before we do so, we would like to thank you for your confidence in buying our book, and we hope that you had as much fun playing around with the samples and games as we did writing them. If you didn t have fun, please let us know what we can do better, so our next books can meet suit your expectations and needs. (You can find our latest contact information at http:// www.apress.com.)

The one area in which filters are somewhat less than ideal is in their configuration. Filters are configured in the web.xml file, and as such have no special access to the Spring configuration context. Fortunately, Spring provides a solution: a DelegatingFilterProxy filter is configured in the Java EE deployment context file, and this in turn passes all the requests to a filter (literally implementing the Java EE standard javax.servlet.Filter interface) configured as a bean within the Spring application context. Acegi provides a large number of filters to implement web security, allowing the desirable behavior to be applied by picking and choosing from the available filters. In principle, there could be as many DelegatingFilterProxy and associated Acegi filter beans as necessary, but this would divide the configuration confusingly between the Spring and Java EE configuration files. Instead, the Spring filter bean used is usually the FilterChainProxy. This is simultaneously a filter, a Spring bean, and a container for other filter beans chaining them together and applying them in turn. Figure 7-2 shows the relationship between the filters and their respective configuration files.