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try { // Wait for a connection request, and return a TcpClient // initialized for communication. using (TcpClient client = listener.AcceptTcpClient()) { Console.WriteLine("Connection accepted."); // Retrieve the network stream. NetworkStream stream = client.GetStream(); // Create a BinaryWriter for writing to the stream. using (BinaryWriter w = new BinaryWriter(stream)) { // Create a BinaryReader for reading from the stream. using (BinaryReader r = new BinaryReader(stream)) { if (r.ReadString() == Recipe10_10Shared.RequestConnect) { w.Write(Recipe10_10Shared.AcknowledgeOK); Console.WriteLine("Connection completed."); while (r.ReadString() != Recipe10_10Shared.Disconnect) { } Console.WriteLine(Environment.NewLine); Console.WriteLine("Disconnect request received."); } else { Console.WriteLine("Can't complete connection."); } } } } Console.WriteLine("Connection closed."); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } finally { // Close the underlying socket (stop listening for new requests). listener.Stop(); Console.WriteLine("Listener stopped."); } // Wait to continue. Console.WriteLine(Environment.NewLine); Console.WriteLine("Main method complete. Press Enter"); Console.ReadLine(); } } }

The last argument of each filter definition is a block of code that you can use to define a before filter: before = { log.debug "Parameters: ${params.inspect()}" } A before filter can also return false, which signifies that the intercepted action should not be executed, something that is critical for security plugins. As well as the before filter, there is also an after filter: after = { model -> log.debug "Model: ${model .inspect()}" } As you can see, the after filter is a little special because it gets passed the model that the view will use to render. Note also that the after filter gets executed before view rendering. If you want to execute a filter after the view has rendered, you can use the afterView filter, as shown in Listing 14-14. Listing 14-14. Using the afterView Filter after = { request.currentTime = System.currentTimeMillis() } afterView = { log.debug "View took ${System.currentTimeMillis()-request.currentTime}ms" } Listing 14-14 shows an example that profiles how long it takes for view rendering to complete. As you can see, filters provide an excellent mechanism for implementing crosscutting concerns, because they can be applied across multiple controllers and/or actions. For example, Listing 14-15 shows a very trivial security filter that checks whether a user is logged in. Listing 14-15. A Security Filter class SecurityFilters { def filters = { loginCheck(controller:'*', action:'*') { before = { if(!session.user && actionName != 'login') { redirect(action:'login') return false } } } } } The security plugins available for Grails make extensive usage of its filters mechanism. In the next section, we ll talk about the JSecurity plugin as an example.

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The following code is a template for a basic TCP client. It contacts the server at the specified IP address and port. In this example, the loopback address (127.0.0.1) is used, which always points to the local computer. Keep in mind that a TCP connection requires two ports: one at the server end and one at the client end. However, only the server port to connect to needs to be specified. The outgoing client port can be chosen dynamically at runtime from the available ports, which is what the TcpClient class will do by default. using using using using System; System.IO; System.Net; System.Net.Sockets;

The JSecurity plugin builds on the excellent JSecurity library (http://www.jsecurity.org/) to provide authentication and authorization to a Grails application. The JSecurity plugin works by combining a set of one or more security filters with a security realm. The realm is the bridge between JSecurity and Grails, and it provides methods that you can implement to facilitate authentication and authorization. To get started with JSecurity, you have to install the plugin by running the install-plugin command, as shown in Listing 14-16. Listing 14-16. Running the install-plugin command $ grails install-plugin jsecurity ... Plugin jsecurity-0.2.1 installed Plug-in provides the following new scripts: -----------------------------------------grails create-auth-controller grails create-db-realm grails create-ldap-realm grails quick-start As you can see from the output in Listing 14-16, the JSecurity plugin provides various additional commands that help you integrate it with Grails, the details of which are listed here: create-auth-controller: This creates a controller that implements logging in and logging out using JSecurity APIs. create-db-realm: If you don t already have a domain model that represents users and roles, this command will create one that uses GORM to store user information to the database. create-ldap-realm: This creates a realm that authenticates users against a configured LDAP server. quick-start: This combines the create-db-realm and create-auth-controller commands to set up JSecurity in a single command.

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