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way. Because dealing with packet writers is easier, let s work with them. Start by creating a new class-level variable in your NetworkHelper class, named packetWriter: PacketWriter packetWriter = new PacketWriter(); You can now use this packet writer to stream your messages to one or all the other remote players by looping through your session s LocalGamers collection and calling the SendData method, as follows: public void SendMessage(string key) { foreach (LocalNetworkGamer localPlayer in session.LocalGamers) { packetWriter.Write(key); localPlayer.SendData(packetWriter, SendDataOptions.None); message = "Sending message: " + key; } } The SendData method can define the reliability and the order reinforcement for the message in its SendDataOptions parameter, which can be set to the follows: None: Packet sent with no guarantees. InOrder: Packet sent in order, but a packet loss might happen. Reliable: Packet always reaches its destination, but might arrive out of order. ReliableInOrder: No packet loss, and all packets are delivered in the same order they were sent. Chat: Mark the message as chat data (new to XNA 3.0).

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public interface SoapUserAccountService extends Remote { public String[] listUserNames() throws RemoteException; } The implementation class implements the service, but also extends the ServletEndpointSupport class. Our service class (the endpoint) will be instantiated and invoked directly by the Axis servlet, so we need to provide a mechanism for accessing the service bean in the Spring context. Listing 9-25 shows how we obtain the bean by dependency lookup from the endpoint s onInit() method.

Note The Chat option can be combined with the other members of the enumeration, such as InOrder or Reliable, and will cause the data inside the network packet to be sent without encryption. This was included to allow XNA network packets to comply with international regulations regarding encrypted chat. Keep in mind that to maintain security, other game data should not use this flag, although it s okay to mix chat data with other data (in other words, to mix encrypted and nonencrypted data) in the same packet.

// Establish the factory to // contain the bean definitions final DefaultListableBeanFactory bf = new DefaultListableBeanFactory(); // Register the transport implementations bf.registerBeanDefinition("smtp", new RootBeanDefinition(SmtpImpl.class,true)); bf.registerBeanDefinition("soap", new RootBeanDefinition(SoapImpl.class,true)); // Register and configure the SMTP example as // a bean definition BeanDefinitionBuilder builder = null; builder = BeanDefinitionBuilder. rootBeanDefinition(LooselyCoupled.class); builder = builder.setSingleton(true); builder = builder.addConstructorArgReference("smtp"); bf.registerBeanDefinition("looseSmtp",builder.getBeanDefinition()); // Register and configure the SOAP example as // a bean definition builder = BeanDefinitionBuilder. rootBeanDefinition(LooselyCoupled.class); builder = builder.setSingleton(true); builder = builder.addConstructorArgReference("soap"); bf.registerBeanDefinition("looseSoap",builder.getBeanDefinition()); // Instantiate the smtp example and invoke it final LooselyCoupled lc1 = (LooselyCoupled)bf.getBean("looseSmtp"); lc1.sendMessage(); // Instantiate the soap example and invoke it final LooselyCoupled lc2 = (LooselyCoupled)bf.getBean("looseSoap"); lc2.sendMessage(); The first question that would tend to spring to mind after reading through Listing 3-5 and comparing it to Listing 3-4 is, Why would I ever want to do something so ungainly You wouldn t, of course. Listing 3-5 is purely an illustration of what goes on under the covers of the framework. You might use a few of these classes if you were extending part of the framework itself, but most developers will never (or at most rarely) need to touch

Remember what we said in the beginning of this chapter: decide which option is best for your game. Additionally, the SendData method has overloads that receive an extra NetworkGamer parameter, which allows your game to send messages to a specific player. If this parameter is not reported, the message is delivered to all signed-in players. In the SendMessage method, you are packing only one string, but you could pack a number of variables, depending on your game logic. For example, if you want to send the left thumbstick and both triggers state to all other players, you can write your packet as shown in the next code fragment:

upon BeanDefinitionBuilder and the like. I will show you how the equivalent Spring configuration would really be defined in the discussion of Listing 3-7 later in this chapter. Listing 3-5 does illustrate some important parts of the architecture that you will be working with, however, so it is worth taking the time to understand what is involved here. The first line of the application establishes a DefaultListableBeanFactory instance. This is a bean factory that provides no direct assistance in preparing the bean definition information. The developer must programmatically assign all the bean definition information: