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As discussed before, ClientConnectionManager is used as the datasource for most of the data bound to the XAML for the client UI, and therefore implements INotifyPropertyChanged; the appropriate property setters raise PropertyChanged events After the user specifies the IP address, a port, and a participant name in the initial login screen, you establish a connection to the server To do this, call the Join() method, which uses the SocketConnectAsync() method to establish the server connection You specify the details of the remote endpoint (IP address and port) in the SocketeventArgs parameter You also specify Connection_Completed() as the completion handler for ConnectAsync() When a successful socket connection is established, in Connection_Completed() you send the first application-specific message of type ConnectionDisconnectionRequest to the server, with the ConnectionDisconnectionRequestConnect property set to True, to indicate a request for connection.

You wrap the message in an instance of the MessageWrapper type, serialize it to a MemoryStream, and use the MemoryStream contents to fill the send buffer Attach ConnectionRequestSend_Completed() as the completion handler, and then call SendAsync() to send the request When the send request returns, ConnectionRequestSend_Completed() is invoked; you check for a successful send by checking the SocketAsyncEventArgsSocketError property In the event of a successful operation, this property is set to SocketErrorSuccess; a plethora of other values indicate different error conditions On a successful send, you prepare the client for receiving a message back from the server by calling ReceiveMessage() You also switch the client UI to display the view with the list of participants by calling ShowParticipantsView() on the Page In ReceiveMessage(), you use a preallocated buffer to receive all your messages You call SocketReceiveAsync() to start receiving messages, after attaching the Receive_Completed() completion handler.

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Google also gives programmers an enormous amount of leeway in what they work on; they have a concept called 20% time, which allows anyone to devote 20% of their time to any project they want, without getting anyone s approval.

When a message is successfully retrieved, you copy it out of the message buffer into a temporary one before you process the message and take appropriate action Note that you call ReceiveMessage() again as soon as you complete processing the previous message in order to keep the socket in a constant receive mode and not miss any incoming messages albeit on a background thread because of the asynchronous nature of ReceiveAsync() The ProcessMessage() method is central to the client-side message processing Incoming messages are deserialized from byte[] to MessageWrapper instances by calling MessageWrapperDeserializeMessage(), as shown in Listing 7-19 The type of the contained message in MessageWrapperBody is used to determine the action taken The first message a client receives is the server s acknowledgment of the connection, in the form of a ConnectionReply message The ConnectionReply.

Participants collection contains the names of all the other participants logged in; you bind that collection to the participants ListBox on the UI and switch the view by calling ShowParticipantsView() on the page For incoming TextMessage instances, if the client is not already in chat mode, you switch the UI appropriately by calling ShowChatView() and then display the message by adding it to the Conversations collection bound to the ListBox used to display a conversation You also set the ClientConnectionManagerTalkingTo property to the name of the participant from whom you are receiving the message, as indicated by the TextMessageFrom property Clients can also receive a couple of other types of messages When you receive a ChatEndNotification, you reset the TalkingTo property, clear the conversation ListBox, and switch to the participants view.

Note For more information about the Dojo toolkit, visit this URI: http://dojotoolkit.org/

For a ConnectionDisconnectionNotification, if the Connect property is True (indicating that a new participant is connecting), you add the participant to the bound Participants property; otherwise, you remove them, and switch views if you were currently in conversation with the disconnecting participant The ClientConnectionManager class also implements various methods for sending different types of messages from the client All of these methods follow the same pattern demonstrated when you sent the first ConnectionDisconnectionRequest earlier: you create and initialize a new message instance of the appropriate message type, serialize it using MessageWrapperSerializeMessage(), and then send it using SocketSendAsync()..

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