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public Object initializeRequest() { return null; } public void destroyRequest( Object objData) { } public boolean isTrigger(Object objData, HttpServletRequest request, HttpServletResponse response) { if (_router.IsResource( request)) { return true; } return false; } public void runFilter(Object objData, HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException { Rewriter rewriter; try { rewriter = (Rewriter)ResourceEngineFilter.class.getClassLoader(). loadClass(_clsRewriter).newInstance(); } catch( Exception ex) { return; } _router.WriteRedirection( rewriter, request); } } In the example class ResourceEngineFilter, the methods isTrigger and runFilter are implemented, as required by TriggerFilter. The method init is used to initialize the filter and retrieve the filter configuration information, and specifically the base-directory that is used by the class FilterRouter or the Router interface instance. In the implementation of init, the default Router instance _router is instantiated by using the configuration declaration item router. In contrast, in the Permutations pattern implementation, the instantiation of Router was hard-coded. Regardless of how the Router interface instance is instantiated, in the example of ResourceEngineFilter, the Router interface instance must be stateless with respect to the HTTP request. The statelessness is required because the Router instance is associated with the ResourceEngineFilter, which is also stateless. What is not stateless, but is instantiated with every triggered filter request, is the Rewriter interface instance. This is because the implementations of the Rewriter will require multiple calls, and the calls will reference some state generated by the HTTP request. The statelessness results in a modified version of the Router interface that is defined as follows:

This is great for creatively designing your game while you code it An example of this is building a multilevel game, with many game screens and different styles of play In this simple game, there s only one level and then the game ends But how could we expand this to create more game levels Very simply: create a model, view, and controller for each level For level one, you might have three classes: LevelOneModel, LevelOneView, and LevelOneController They would be functionally almost identical to the three classes we ve just looked at However, in a multilevel game, you would also use a GameModel, GameView, and GameController Their tasks would be to manage the overall running of the game The GameModel would track the global data, like the score, that s needs to run the game, and set the overall conditions for winning and losing.

Since the Security Application Block gets its greatest benefit in web applications, we ll create a web application for the examples in this chapter. Before you begin, make sure that you have compiled the Security.Azman and Security.Azman.Configuration.Design projects, mentioned in the previous section. Also, ensure you have IIS 5.1 or greater installed on your computer. Follow these steps to create the application and add the Security Application Block: 1. Create a new C# web site for your application called SecurityDemo and add the following references to it: Microsoft.Practices.EnterpriseLibrary.Security.dll Microsoft.Practices.EnterpriseLibrary.Security.AzMan.dll Microsoft.Practices.EnterpriseLibrary.Security.Cache.CachingStore.dll 2. Using the IIS Manager, remove anonymous access from the virtual directory. 3. Set the Default.aspx page as the start page.

Optionally, you might also find it useful to store individual levels as data in the game This is the same concept as storing the screen sprite as data, except on a wider scope Game levels are a kind of data, so it might make sense for GameModel to store them This is especially true if data needs to be shared between levels The GameModel can then act as a single resource for this data The GameView would switch levels and handle the game s menus and user interface (Specific menus for each level are handled by the level s view) It would listen for changes in the model to figure out when it should switch levels It then would ask the GameController to create a new level The GameController would create the levels Levels are complete, self-contained MVC systems in their own right.

public interface Router { public void setConfiguration( String key, String value); public boolean IsResource(HttpServletRequest request); public void WriteRedirection( Rewriter rewriter, HttpServletRequest request); } The modification of the interface involves the addition of the setConfiguration method, which assigns the configuration information. The configuration information is used by the Router interface implementation when figuring out whether a request is a resource or a specific representation. The method WriteRedirection has been modified to include the parameter rewriter. As the configuration information is passed to the Router interface instance, having the parameter rewriter may not seem necessary. It is necessary because otherwise a hidden dependency in the implementation of the interfaces is created, complicating the development of modular code. The implementations of the Rewriter and Router interfaces remain as illustrated in the Permutations pattern. The resulting implementation is a prototype example for the server side that can be used to filter implementations. When implementing the Decorator pattern, the filters should be stacked by using the HTTP filter mechanism. What is important is the ordering of the filters, because some HTTP filter implementations have an ordering dependency.