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The Java remote method invocation (RMI) protocol is available as a standard part of the JSE environment. For the Java developer, RMI is probably the default choice in any situation where you can guarantee that the applications at both ends of the connection will always be Java based. Spring s support for RMI-based remoting is particularly convenient. To make an interface accessible over RMI, you will need to configure an additional bean to create an RMI registry and associate it with the service bean. Any objects passed into or returned from the exported service methods must be made serializable (RMI uses serialization to pass parameter values over TCP socket connections). The benefit of RMI in Spring is its simplicity of implementation. Its deficiency is that this is not an especially portable mechanism (Java RMI is not compatible with C# RMI, for example), so this is not a good choice if you want to make a service available to independently developed client applications. Because of this ease of implementation, a common usage of RMI services is to create rich administrative applications. This allows administrative staff to have a desktop application for updating a web application. Because the RMI client calls into the same service layer that is being used by the web front end, the amount of software development required is reduced, and the scope for introducing new problems (and corrupting data in unexpected ways) is also limited. It is possible to tunnel the RMI wire protocol (JRMP) over an HTTP connection, but this feature is only infrequently used because some aspects of the service behavior will then be dependent on intervening network infrastructure such as proxy servers and firewalls.

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// Put the meteor back to your initial position meteors[i].PutinStartPosition(); return true; } } return false; } /// <summary> /// Allows the GameComponent to draw your content in the game screen /// </summary> public override void Draw(GameTime gameTime) { // Draw the meteors for (int i = 0; i < meteors.Count; i++) { meteors[i].Draw(gameTime); } base.Draw(gameTime); } } } Observe that this class contains a great deal of the code that was previously inside the Game1 class in the previous chapter, but essentially it does the same thing. You ll use this class later to compose the action scene.

Note Overall, it s a good idea to create a management class for each group of GameComponents in a game. It s normal to see classes such as EnemyManager, WizardManager, and so on, because this puts all the complexity of this type of game element in only one class. This simplifies the code and maximizes the reuse of these components in other games.

The server application is, largely, the existing timesheet web application. We will be exposing only one small part of it, the user account service, the methods of which are defined by the UserAccountService interface. This is shown in Listing 9-1.

Another element you need to create for the action scene is the scoreboard. This scoreboard shows the quantity of points and energy of the player s ship. This class is simple: it only draws two lines of text on the screen. Add a class to the project called Score, and add the code in Listing 4-5.

public interface UserAccountService { UserAccount findUser(String username); void createUser(UserAccount account); void deleteUser(UserAccount account); void updateUser(UserAccount account); List<UserAccount> listUsers(); } We will be calling into the listUsers() method of Listing 9-1, which returns a list of UserAccount entities. You should note that the UserAccount entity has been made serializable in order to support this behavior. However, in practice, the requirements of serializability are completely compatible with the requirements for Hibernate-persisted entities, so only trivial changes (if any) are normally necessary in our type of environment. Aside from the objects to be passed into or returned from the service, the rest of the implementation is irrelevant; the implementation bean is exposed via RMI, but the client needs only a copy of the interface and the implementation of the parameter objects. Listing 9-2 shows the addition to the applicationContext.xml configuration file to import the configuration of the RMI server capability.

Listing 4-5. The Score GameComponent #region Using Statements using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; #endregion namespace RockRainEnhanced { /// <summary> /// This is a GameComponent that implements the game score /// </summary> public class Score : DrawableGameComponent { // SpriteBatch protected SpriteBatch spriteBatch = null; // Score position protected Vector2 position = new Vector2(); // Values protected int value; protected int power; protected readonly SpriteFont font; protected readonly Color fontColor; public Score(Game game, SpriteFont font, Color fontColor) : base(game) { this.font = font; this.fontColor = fontColor; // Get the current sprite batch spriteBatch = (SpriteBatch) Game.Services.GetService(typeof (SpriteBatch)); } /// <summary> /// Points value /// </summary>

Listing 9-2. Importing the Spring RMI Configuration <import resource="classpath:timesheet-remote.xml"/>