.NET/ASP.NET/C#/VB.NET PDF Document SDK

/// <summary> /// After creating or joining a network session, we must subscribe to /// some events so we will be notified when the session changes state. /// </summary> void HookSessionEvents() { networkHelper.NetworkGameSession.GamerJoined += GamerJoinedEventHandler; networkHelper.NetworkGameSession.SessionEnded += SessionEndedEventHandler; } When the session is terminated, the preceding code calls the SessionEndedEventHandler method to display the game s network scene again, showing an error message that was sent as the reason for the session to end (using the EndReason attribute of the NetworkSessionEndedEventArgs class that is passed as a method parameter), as follows: // <summary> /// Event handler notifies us when the network session has ended. /// </summary> void SessionEndedEventHandler(object sender, NetworkSessionEndedEventArgs e) { networkScene.Message = e.EndReason.ToString(); networkScene.State = NetworkScene.NetworkGameState.idle; CloseSession(); if (activeScene != networkScene) { ShowScene(networkScene); } } In the GamerJoinedEventHandler method, which is called when the player (local or remote) joins a game session, you check if all (two) players have already joined the session to start the game itself. This activates the action scene for both players and associates the player with the corresponding Player object, which you ll subsequently use to differentiate the local player from the remote player: /// <summary> /// This event handler will be called whenever a new gamer joins the /// session. /// </summary> void GamerJoinedEventHandler(object sender, GamerJoinedEventArgs e) { // Associate the ship with the joined player if (actionScene.Player1.Gamer == null) { actionScene.Player1.Gamer = e.Gamer; }

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<bean id="soapUserAccountService" class="org.springframework.remoting.jaxrpc.JaxRpcPortProxyFactoryBean"> <property name="serviceFactoryClass"> <value>org.apache.axis.client.ServiceFactory</value> </property> <property name="serviceInterface" value="com.apress.timesheets.soap.SoapUserAccountService"/> <property name="wsdlDocumentUrl" value="http://localhost:8080/timesheet/service/SoapUserAccountService wsdl"/> <property name="namespaceUri" value="urn:Timesheet"/> <property name="serviceName" value="SoapUserAccountServiceService"/> <property name="portName" value="SoapUserAccountService"/> </bean> The namespaceUri, serviceName, and portName properties specified in Listing 9-26 must correspond with their respective counterpart wsdlTargetNamespace, wsdlServiceElement, and wsdlPortType properties from the WSDD file of Listing 9-23 (which will in turn be represented by corresponding entries in the WSDL file generated by Axis). The wsdlDocumentUrl property of Listing 9-26 is specified by the usual web application server connection details and context, the mapping of the Axis servlet to the server s URL namespace, and the service element s name property from Listing 9-22. The wsdl suffix is used by Axis to determine that a WSDL file is being requested (which it generates dynamically). The code used to access the remote SOAP service, shown in Listing 9-27, is not substantially different from the code used to access our other remote services after everything is configured directly. From the point of view of the application code, the remote service is just a bean like any other.

CHAPTER 6 ROCK RAIN LIVE!

final SoapUserAccountService service = (SoapUserAccountService)ctx.getBean("soapUserAccountService"); final String[] users = service.listUserNames();

else { actionScene.Player2.Gamer = e.Gamer; } if (networkHelper.NetworkGameSession.AllGamers.Count == maxSessionPlayers) { actionScene.TwoPlayers = true; ShowScene(actionScene); } } The method to terminate the session just releases the NetworkSession object, as it did in the previous chapter: /// <summary> /// Quit the game session /// </summary> private void CloseSession() { networkHelper.NetworkGameSession.Dispose(); networkHelper.NetworkGameSession = null; } Finally, you have the method to join a game session: /// <summary> /// Joins an existing network session /// </summary> void JoinSession() { networkScene.Message = "Joining a game..."; networkScene.State = NetworkScene.NetworkGameState.joining; try { // Search for sessions using (AvailableNetworkSessionCollection availableSessions = NetworkSession.Find(NetworkSessionType.SystemLink, maxLocalPlayers, null)) { if (availableSessions.Count == 0) { networkScene.Message = "No network sessions found."; networkScene.State = NetworkScene.NetworkGameState.idle; return; }

CORBA stands for Common Object Request Broker Architecture. It was one of the first successful protocols in bridging heterogeneous environments. Although it is a binary rather than XML-based suite of protocols, its feature list has a certain amount in common with SOAP: it is supported by a wide selection of platforms. It is well supported by Java, perhaps because CORBA was at the height of its popularity just as Java was becoming popular as a mainstream development language. CORBA suffers from some of the problems of complexity that SOAP labors under. It is also subject to some compatibility problems between different implementations of CORBA. On the whole, it is becoming something of a legacy architecture plenty of existing systems demand it, but new architectures are relatively unlikely to incorporate it for any other reason. In view of this, I have not included a CORBA example in this chapter, but the Java support for CORBA mostly uses the RMI classes and is therefore quite similar in configuration. Where it differs, the Spring classes beginning with the JndiRmi prefix in the org.springframework. remoting.rmi package provide the necessary support.

CHAPTER 6 ROCK RAIN LIVE!

JMS stands for Java Message Service and is the Java EE API for exchanging data with messaging platforms. As such, it is not a remoting mechanism in the same sense as the others mentioned in this section of the chapter, but messages sent and received via JMS can be used to invoke and provide services. Any messaging platform for which JMS drivers exist is supported by Spring, including commercial systems such as IBM WebSphere MQ and Microsoft Message Queuing (MSMQ). There is also a reference implementation in Java. The major advantage of JMS over the other mechanisms is that it provides support (and this in turn is often supported by the underlying platforms) for two-phase commit via JTA to tie operations such as database operations atomically to messaging operations.