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The Rock Rain scoreboard will show the current number of meteors on the screen. First, you need to create the game source and draw it in the game. Then add a new SpriteFont. Call it font and add the following code to declare an object for it: private SpriteFont gameFont; Initialize the object in the LoadGraphicsContent method, just as you did with the other contents, inside the if statement, as follows: // Load game font gameFont = content.Load<SpriteFont>("Content\\font"); The scoreboard is a typical GameComponent, but to show that you don t need to create a component for it, you ll draw this scoreboard in the Draw method of the Game1 class. You can draw it immediately after drawing the game sprites. Add the following code in the Draw method of the Game1 class: // Draw score spriteBatch.Begin(); spriteBatch.DrawString(gameFont, "Rocks: " + rockCount.ToString(), new Vector2(15, 15), Color.YellowGreen); spriteBatch.End(); Notice that you used a separate spriteBatch object to draw the scoreboard. This way, the steps to draw the background picture, the sprites, and the scoreboard are also separated in the video card, avoiding any possible confusion that the card might experience.

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The authentication object allows access to the principal representing the user, from which the username, authorities (authorizations) and other basic details can be retrieved. In Listing 7-21, the UserAccount principal is retrieved from the authentication object. An alternative approach, which uses aspect-oriented programming to enforce security constraints of this type without directly tainting the service logic with security concerns, has already been covered in 5. However, I did not explain at that point the basis on which the security details were obtained. If you revisit 5 at this point, you will see that the implementation of an AOP advice in Listing 5-23 uses the static method of Listing 7-21 to obtain the details of the current principal.

Caution Be careful with the use of third-party fonts in your games. Some fonts, such as TrueType and OpenType, are not royalty-free and have legal restrictions regarding their use. This is especially true of fonts used by Windows. You can find many free fonts on web sites across the Internet.

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Having secured the web tier against inappropriate access, it would be good to be able to enforce a similar level of security in the service layer. There are service layer methods that should never be invoked by ordinary or anonymous users. For example, the operation to delete a user from the database would typically be constrained to administrative users. Similarly, the ability to load a spreadsheet should be denied to anonymous users. One way to achieve protection of the service layer would be to hard-code lots of checks of the authorization information available from SecurityContextHolder. However, this would create an unnecessary dependency precisely what we re trying to avoid in our use of Spring in the first place. A superior solution exists: we can apply an AOP advice to our service layer to enforce security. If you are using the XML configuration of AOP, you can add a suitable pointcut and advice. In fact, you have already seen this approach in use in 5 where we used this very example as an illustration of applying aspects! Method-level role-based security can be applied even more simply by using annotations. By applying the org.acegisecurity.annotations.Secured annotation to your service class methods and then applying an advice to the methods so marked, you can indicate the roles that are required to invoke them. (This is similar to the enforcing of transactionality by using @Transaction annotations as discussed in 5.) Listing 7-22 shows how the user account service interface can be annotated to enforce role-based security.

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