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SerializedMessageGetBuffer(), 0, (int)SerializedMessageLength); sockEvtArgsCompleted += new EventHandler<SocketAsyncEventArgs>( //completion handler delegate(object sender, SocketAsyncEventArgs e) { //not sending anymore Sending = false; }); //begin send ClientSocketSendAsync(sockEvtArgs); } } } An instance of a Participant is created and stored in a list when the ServerConnectionManager receives a connected client socket through the Manage() method The ParticipantStartup() method starts two background threads one each for receiving and sending messages, each of which continue as long as the client socket for that Participant is valid The receive thread calls the ReceiveMessage() method, provided that there is data to be read (as determined by the SocketAvailable property) and that the Receiving boolean flag is set to false The flag is set to true prior to calling ReceiveMessage() and is reset after ReceiveMessage() returns so that the socket is always ready to receive the next message as soon as it arrives.

Attribute itemWidth itemHeigh itemMaxWidth itemMaxHeight attachEdge labelEdge Function Sets the width of fisheyeitem Sets the height of fisheyeitem Sets the maximum width of fisheyeitem Sets the maximum height of fisheyeitem Defines which edge of fisheyeitem the zoom appears to zoom toward Defines which edge of fisheyeitem any labels in the list will be rendered on

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ReceiveMessage() uses the ProcessMessage() method to process and act on a received message ProcessMessage() is structured similarly to the one in the Silverlight client in that it deserializes a message and looks at the type of the contained Body property to determine the course of action For messages that are intended to be delivered to other participants, ProcessMessage delivers it to that participant either through ServerConnectionManagerBroadcast(), which delivers a message to all participants except for the one sending it, or by ServerConnectionManagerSend(), which delivers it to a single targeted participant Delivery of a message in this case is achieved by adding the message to a send queue of type Queue<MessageWrapper> defined in each participant The send thread continously checks the Sending flag (used similarly to the Receiving flag) and the presence of messages in the queue of the owning participant using ParticipantHasMessage().

When a message is found, SendMessage() is called, which then serializes the message and sends it out through the participant s socket..

The policy server is similarly implemented as a console program that listens on all available IP addresses, bound to a well-known port 943. Listing 7-27 shows the code for the policy server. Listing 7-27. Implementation for the PolicyServer type in PolicyListener.cs using using using using using System; System.IO; System.Net; System.Net.Sockets; System.Text;

Some programmers couldn t care less about what programming language they re using, but most would just love to have the opportunity to work with exciting new technologies. Today that may be Python or Ruby on Rails; three years ago it was C# and before that Java. Now, I m not telling you not to use the best tool for the job, and I m not telling you to rewrite in the hot language-du-jour every two years, but if you can find ways for developers to get experience with newer languages, frameworks, and technologies, they ll be happier. Even if you don t dare rewrite your core application, is there any reason your internal tools, or less-critical new applications, can t be written in an exciting new language as a learning project

namespace Recipe7_5.PolicyServer { internal class PolicyListener { Socket ListenerSocket { get; set; } SocketAsyncEventArgs sockEvtArgs = null; //valid policy request string public static string ValidPolicyRequest = "<policy-file-request/>"; public PolicyListener() { //bind to all available addresses and port 943 IPEndPoint ListenerEndPoint = new IPEndPoint(IPAddress.Any, 943); ListenerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); ListenerSocket.Bind(ListenerEndPoint); ListenerSocket.Listen(20); } internal void ListenForPolicyRequest() { sockEvtArgs = new SocketAsyncEventArgs(); sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>( delegate(object Sender, SocketAsyncEventArgs e) { //process this request ReadPolicyRequest(e.AcceptSocket); //go back to listening ListenForPolicyRequest(); }); ListenerSocket.AcceptAsync(sockEvtArgs); } private bool ReadPolicyRequest(Socket ClientSocket) { SocketAsyncEventArgs sockEvtArgs = new SocketAsyncEventArgs { UserToken = ClientSocket }; sockEvtArgs.SetBuffer( new byte[ValidPolicyRequest.Length], 0, ValidPolicyRequest.Length); sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>( delegate(object Sender, SocketAsyncEventArgs e) { if (e.SocketError == SocketError.Success) { //get policy request string

When the user clicks any pet icon in the list, we have to transfer from this page to the catalog.zul page, which displays the photos and descriptions for the type of pet chosen by the user. Therefore, we have to register an onClick event listener for each listitem to invoke the go() method; this method transfers the user from the home page to the page of catalog.zul corresponding to the pet icon the user clicks. In Listing 6-2, the go() method is defined within the <zscript> tag, and it passes the catid, which represents the category of pet, as a parameter. Then, the Executions.sendRedirect() method transfers from the home page to catalog.zul accordingly.

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