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Online multiplayer games, also known as network-enabled games or simply networked games, are hard to code. Period. That said, it s also important to state that, in XNA, this difficulty is not related to coding for connecting the machines (PC or Xbox 360) or making them communicate with each other. That s because XNA hides all complexities from you in this case, as it does with everything else in the framework. Networked games are hard to code because there are many extra problems to deal with: your program will receive messages from the host or other players, send messages back to them, process the local player input, and perform the physics and artificial intelligence calculations, while not letting the screen freeze between each frame drawn (one of the worst things that might happen in a multiplayer game). Fortunately, XNA can help developers with most of the communication problems, such as providing ways to control the message flow between players and host to guarantee that no message is lost and that all messages arrive in the same order they were sent. Nevertheless, there will still be some problems to solve.

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<bean name="hessianUserAccountService" class="com.apress.timesheets.hessian.HessianUserAccountServiceImpl"> <property name="userAccountService" ref="userAccountService"/> </bean> <bean name="/userAccountService" class="org.springframework.remoting.caucho.HessianServiceExporter"> <property name="service" ref="hessianUserAccountService" /> <property name="serviceInterface" value="com.apress.timesheets.hessian.HessianUserAccountService"/> </bean> Listing 9-13 also shows the configuration of the exporter. This Spring wrapper for the Hessian server component is near identical to the corresponding exporter for Spring s HTTP invoker mechanism. The pathname is defined by the bean name. The exporter passes incoming requests to a specified service bean that must implement the specified service interface. The only significant difference in configuration is our use of a service wrapper and corresponding interface to avoid the conflict with Hibernate lazy loading.

Reward: Rewarding players when they win is as important as offering good challenges for them to beat These rewards might be special items, money, energy, lives, unlocking new levels, and so on They include in-level challenge prizes (such as an amount of gold and extra experience gained for every monster defeated), end-of-level awards (such as presenting a cut-scene and giving bonus points), achievements (either LIVE achievements, which are presented in your game profile at Xbox 360 LIVE, or in-game achievements, such as the achievements in the Spore game), and a big show at the game ending.

The Hessian client configuration also corresponds closely to the HTTP invoker s client configuration. The client bean is provided with the path to the remote service, and calls to the factory materialize proxy instances that implement the supplied service interface. Listing 9-14 shows this configuration.

Remember that nothing is more frustrating for a player than spending dozens of hours to win a game, only to see a puny congratulations screen at the end! Saving and registering: How the game saves the evolution of player characters throughout the game and the means it provides to the players to register their experience are important parts of the game s playability and reward system In long games, providing a way for players to start easily from where they left off, a way to register their high scores and compare their scores to other people s scores, and even the ability to take pictures from the game to present later to their friends might make the difference needed to provide the right appeal Game ecosystem: Nowadays, the game team must remember that a video game isn t just the individual piece of game software.

<bean id="hessianUserAccountService" class="org.springframework.remoting.caucho.HessianProxyFactoryBean"> <property name="serviceUrl" value="http://localhost:8080/timesheet/hessian/userAccountService"/> <property name="serviceInterface" value="com.apress.timesheets.hessian.HessianUserAccountService"/> </bean>

It includes communities of players on the Internet, homemade extensions created by fans, and so on These considerations must guide all game development from planning a long-term game franchise, coding a game that allows expansions, and establishing marketing approaches to increment the participation of fans in online communities, among other initiatives Polishing: A great game is great only if every detail is planned and developed to contribute to player immersion Such details should be tested to make sure they work as planned If a game appears to offer some freedom of choice to the player, but presents a you can t do this message or, even worse, an error message every time the player tries something imaginative, it s halfway to a total failure Remember to include test time in every game project, even the simpler ones! Enough planning for now.

In the next section, you ll create your first XNA project and explore the game programming concepts behind it..