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The chat server is implemented as a console program. The functionality is divided into two primary classes: ConnectionListener, which accepts incoming client connections, hands them over to a ServerConnectionManager instance, and continues to listen for more connections; and ServerConnectionManager, which manages and processes messages for each connected client and then routes messages between clients. Listing 7-25 shows the ConnectionListener class that you use in the server program to listen and accept incoming connections from clients. Listing 7-25. ConnectionListener class in ConnectionListener.cs using System; using System.Net; using System.Net.Sockets; namespace Recipe7_5.ChatBroker { internal class ConnectionListener { //the socket used for listening to incoming connections Socket ListenerSocket { get; set; } SocketAsyncEventArgs sockEvtArgs = null; //new server connection manager ServerConnectionManager ConnManager = new ServerConnectionManager(); //run the connection listener internal void Run(int Port) { //create a new IP endpoint at the specific port, //and on any available IP address IPEndPoint ListenerEndPoint = new IPEndPoint(IPAddress.Any, Port); //create the listener socket ListenerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //bind to the endpoint ListenerSocket.Bind(ListenerEndPoint); //listen with a backlog of 20 ListenerSocket.Listen(20); Console.WriteLine("Waiting for incoming connection ..."); //start accepting connections AcceptIncoming(); } //accept incoming connections internal void AcceptIncoming() { //pass in the server connection manager

sockEvtArgs = new SocketAsyncEventArgs { UserToken = ConnManager }; sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>( delegate(object Sender, SocketAsyncEventArgs e) { Console.WriteLine("Accepted connection..." + "Assigning to Connection Manager...." + "Waiting for more connections..."); //pass the connected socket to the server connection manager ConnManager.Manage(e.AcceptSocket); //keep listening AcceptIncoming(); }); //accept an incoming connection ListenerSocket.AcceptAsync(sockEvtArgs); } } } The ConnectionListener class is instantiated and launched by calling its Run() method from the server program s Main() method. In Run(), you create an IPEndpoint using the port number passed in as a command-line argument. Specifying IPAddress.Any as the IPAddress parameter allows the listener to listen on all available IP addresses on the machine, which is especially handy on machines that have multiple active network connections. You then bind the socket to the endpoint and start listening by calling Socket.Listen(). The parameter to Listen() specifies the size of the backlog of incoming connections that the runtime maintains for you while you process them one at a time. Finally, you call AcceptIncoming(). The AcceptIncoming() method uses Socket.AcceptAsync() on the listener socket to asynchronously accept an incoming connection. In the Completed handler of SocketAsyncEventArgs, the connected client socket is available in the SocketAsyncEventArgs.AcceptSocket property. You pass this socket on to an instance of the ServerConnectionManager type through its Manage() method. You then continue to accept more incoming connections. The ServerConnectionManager type is used to manage all connected client sockets. You also define a Participant type to represent a specific connected client and its communications. Listing 7-26 shows the code for these two classes. Listing 7-26. Implementation for ServerConnectionManager and participant types in MessageProcessing.cs using using using using using using System; System.Collections.Generic; System.IO; System.Linq; System.Net.Sockets; System.Threading;

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{ //list of participants private List<Participant> _Participants = new List<Participant>(); internal List<Participant> Participants { get { return _Participants; } } //accept and manage a client socket internal void Manage(Socket socket) { //create a new Participant around the client socket Participant p = new Participant { ClientSocket = socket, Parent = this }; //add it to the list _Participants.Add(p); //start up the participant p.StartUp(); } //broadcast a message from a participant to all other participants internal void Broadcast(string From, MessageWrapper Message) { //get a list of all participants other than the one sending the message List<Participant> targets = (from p in Participants where p.Name != From select p).ToList(); //iterate and add to the Send queue for each foreach (Participant p in targets) { lock (p.QueueSyncRoot) { p.SendQueue.Enqueue(Message); } } } //send a message to a specific participant internal void Send(string To, MessageWrapper Message) { //get the Participant from the list Participant target = (from p in Participants where p.Name == To select p).ToList()[0]; //add to the send queue for the participant lock (target.QueueSyncRoot) { target.SendQueue.Enqueue(Message);

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