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A single TCP endpoint (IP address and port) can serve multiple connections. In fact, the operating system takes care of most of the work for you. All you need to do is create a worker object on the server that will handle each connection on a separate thread. The TcpListener.AcceptTcpClient method returns a TcpClient when a connection is established. This should be passed off to a threaded worker object so that the worker can communicate with the remote client. Alternatively, call the TcpListener.BeginAcceptTcpClient method to start an asynchronous operation using a thread-pool thread that waits in the background for a client to connect. BeginAcceptTcpClient follows the asynchronous execution pattern, allowing you to wait for the operation to complete or specify a callback that the .NET runtime will call when a client connects. (See recipe 4-2 for details on the options available.) Whichever mechanism you use, once BeginAcceptTcpClient has completed, call EndAcceptTcpClient to obtain the newly created TcpClient object. To exchange network data asynchronously, you can use the NetworkStream class, which includes basic support for asynchronous communication through the BeginRead and BeginWrite methods. Using these methods, you can send or receive a block of data on one of the threads provided by the thread pool, without blocking your code. When sending data asynchronously, you must send raw binary data (an array of bytes). It s up to you to choose the amount you want to send or receive at a time. One advantage of this approach when sending files is that the entire content of the file does not have to be held in memory at once. Instead, it is retrieved just before a new block is sent. Another advantage is that the server can abort the transfer operation easily at any time.

The following example demonstrates various techniques for handling network connections and communications asynchronously. The server (Recipe10-11Server) starts a thread-pool thread listening for new connections using the TcpListener.BeginAcceptTcpClient method and specifying a callback method to handle the new connections. Every time a client connects to the server, the callback method obtains the new TcpClient object and passes it to a new threaded ClientHandler object to handle client communications. The ClientHandler object waits for the client to request data and then sends a large amount of data (read from a file) to the client. This data is sent asynchronously, which means ClientHandler could continue to perform other tasks. In this example, it simply monitors the network stream for messages sent from the client. The client reads only a third of the data before sending a disconnect message to the server, which terminates the remainder of the file transfer and drops the client connection. Here is the code for the shared protocol: namespace Apress.VisualCSharpRecipes.10 { public class Recipe10_11Shared { public const string AcknowledgeOK = "OK"; public const string AcknowledgeCancel = "Cancel"; public const string Disconnect = "Bye"; public const string RequestConnect = "Hello"; public const string RequestData = "Data";

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To get started, you need to create new realm class in the grails-app/realms directory. In Figure 14-3 you can see we ve created a new realm class called AuthRealm in the com.g2one. gtunes package.

To select which accounts to add, launch iTunes and connect your iPod. Select your iPod from the source list (the column at the left of the iTunes window; your iPod appears under the DEVICES heading). The iTunes window updates and displays a summary of your iPod, including its name, the software version, and so forth. Click the Info tab at the top of this window. Scroll down the Info tab to the Mail Accounts section. Here, you can choose whether to synchronize your mail accounts to your iPod. Check the Sync selected Mail accounts check box, and pick the accounts you want to use. Next, scroll down farther on the Info tab, below the Mail Accounts and Web Browser sections, to the Advanced section (see Figure 11-3). As a rule, your iPod won t add new accounts until you force things. Unlike normal syncs that just update data, when you select to replace your mail accounts on your iPod using the Advanced settings, iTunes updates your iPod with all the accounts you just selected in the Mail Accounts settings.

} } Here is the server code: using using using using using System; System.IO; System.Net; System.Threading; System.Net.Sockets;

Figure 14-3. The AuthRealm class The next step is to implement the authenticate method for the AuthRealm class, as shown in Listing 14-20. Listing 14-20. The authenticate Method of the AuthRealm class AuthRealm { static authTokenClass = org.jsecurity.authc.UsernamePasswordToken CredentialsMatcher credentialMatcher def authenticate(authToken) { ... } } As you can see, the code uses the org.jsecurity.authc.UsernamePasswordToken class for the authToken instance that will be passed to the authenticate method. Since there is already an existing com.g2one.gtunes.User domain class that contains login and password properties, the UsernamePasswordToken class is a logical choice here. Another thing you ll note from the code in Listing 14-20 is the credentialMatcher property. This property is injected by Spring at runtime. The default implementation used is the org.jsecurity.authc.credential.Sha1CredentialsMatcher, which expects that credentials that are stored are SHA hashed, a pretty common practice.

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