// Input helper inputHelper = new InputHelper(PlayerIndex.One, SettingsManager.GetKeyboardDictionary( gameSettings.KeyboardSettings[0])); Services.AddService(typeof(InputHelper), inputHelper); // Game screen Components.Add(new GameScreen(this, LevelCreator.Levels.AlienPlanet)); } In the class constructor, you first set the game screen title and the root directory of the content manager. Next, you read the game settings from an XML file, using the SettingsManager class, and use the game settings to configure the GraphicsDeviceManager and the InputHelper. After reading the game settings, you create the GraphicsDeviceManager and call the ConfigureGraphicsManager method, configuring it with the struct containing the GameSettings that have been read in and deserialized earlier in this chapter. After that, you create the InputHelper, and use the KeyboardSettings of the GameSettings to configure it. Last, you create a GameScreen and add it to the Components of the Game class. After you ve added the GameScreen to the Components of the Game class, it will be updated and drawn automatically when needed by the XNA Framework, since it inherits from the GameComponent class. Following is the code for the ConfigureGraphicsManager method used to configure the GraphicsDeviceManager: private void ConfigureGraphicsManager(GameSettings gameSettings) { #if XBOX360 graphics.PreferredBackBufferWidth = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width; graphics.PreferredBackBufferHeight = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Height; graphics.IsFullScreen = true; #else graphics.PreferredBackBufferWidth = gameSettings.PreferredWindowWidth; graphics.PreferredBackBufferHeight = gameSettings.PreferredWindowHeight; graphics.IsFullScreen = gameSettings.PreferredFullScreen; #endif // Minimum shader profile required graphics.MinimumVertexShaderProfile = ShaderProfile.VS 2 0; graphics.MinimumPixelShaderProfile = ShaderProfile.PS 2 A; } In the ConfigureGraphicsManager method, if the current platform is the Xbox 360, you set the width and height of the screen s buffer as the width and height of the current display adapter. Otherwise, you set the width and height of the screen s buffer according to the GameSettings parameter. Last, you check if the current video card supports shader 2.0.

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Managing security in an application is not a simple problem to solve at the best of times, but is made particularly difficult in practice because of the broad range of existing solutions to security and the frequent need to manage security across multiple platforms. The existing Java Authentication and Authorization Service (JAAS) API attempts to alleviate this, but in some ways presents its own problems. JAAS is a notoriously difficult API to work with, and often security is managed directly through other APIs such as the Lightweight Directory Access Protocol (LDAP) or through custom database implementations rather than using the higher-level JAAS approach. Spring Security does offer its own (database-backed) security approach, but is also unusually accommodating of alternative implementations. It provides a simple mechanism to allow you to integrate with existing nonstandard code, as well as a number of implementations to connect to common authentication mechanisms such as LDAP. Figure 7-1 shows the typical components in a configured Acegi-secured web application. This looks pretty daunting, but these classes divide neatly into the filters (required for managing web security) and the components that provide access to the authentication and authorization data.


When securing a web application, our primary concern should be to prevent access to the application as a whole and then to open up access for specific groups of users to specific components. This deny by default rule reduces the impact of errors of omission when configuring the security of a system. In our example web application, the application as a whole is offlimits to all users unless they log in. Furthermore, there are parts of the application that are off-limits to all logged-in users unless they are administrators. The configuration examples in this chapter illustrate these three parts of the application: anonymous, user, and administrator accessible. Naturally, we do not want to embed security-related code into all of our service classes, DAOs, controller classes, and so forth. We want to set up our rules quite independently so that we will not have to change the implementation details if the access rules change.


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