/// <summary>
/// Called when the client wants to send a user defined message to the server.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SendButton_Click(object sender, RoutedEventArgs e)
{
LogToTextBox("Attempting to send UserDefined message");
Message m = new Message();
m.mID = IDTextBox.Text;
m.mType = MessageType.UserDefined;
m.mValues.Add("Payload", PayloadTextBox.Text);
SendInfo sendInfo;
sendInfo.client = mClient;
sendInfo.data = m.ToString();
Thread t = new Thread(NewSendThread);
t.Start(sendInfo);
}
/// <summary>
/// Set up an unsubscribe message to the server.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void UnsubscribeButton_Click(object sender, RoutedEventArgs e)
{
LogToTextBox("Attempting to send Unsubscribe message");
Message m = new Message();
m.mID = SubscribeIDTextBox.Text;
m.mType = MessageType.Unsubscribe;
SendInfo sendInfo;
sendInfo.client = mClient;
sendInfo.data = m.ToString();
Thread t = new Thread(NewSendThread);
t.Start(sendInfo);
}
/// <summary>
/// Called when the server gets a callback from BeginReceive
/// </summary>
/// <param name="ar">Holds state information like the client socket and buffer size</param>
private void ReadCallback(IAsyncResult ar)
{
// Unblock any previous read calls
mWindowClosing.Set();
// Set up state data
String content = String.Empty;
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
try
{
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// Get the data that was read
state.sb.Clear();
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
content = state.sb.ToString();
LogToTextBox("Received message: " + content);
// Construct a new message from the received data
Message m = new Message(content);
if (m.mType == MessageType.Subscribe)
{
// If subscribe, just add the client to the subscribers list
if (mIDToSubscribers.ContainsKey(m.mID))
{
mIDToSubscribers[m.mID].Add(handler);
}
else
{
List<Socket> clients = new List<Socket>();
clients.Add(handler);
mIDToSubscribers.Add(m.mID, clients);
}
}
if (m.mType == MessageType.Unsubscribe)
{
// If unsubscribe, just remove the client from the subscribers list.
if (mIDToSubscribers.ContainsKey(m.mID))
{
mIDToSubscribers[m.mID].Remove(handler);
}
}
if (m.mType == MessageType.UserDefined)
{
// If Userdefined, distribute it to all client subscribers
if (mIDToSubscribers.ContainsKey(m.mID))
{
List<Socket> socketsToRemove = new List<Socket>();
foreach (Socket client in mIDToSubscribers[m.mID])
{
byte[] byteData = Encoding.ASCII.GetBytes(content);
try
{
client.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), client);
}
catch (Exception ex)
{
LogToTextBox(ex.ToString());
socketsToRemove.Add(client);
}
}
foreach (Socket client in socketsToRemove)
{
foreach (KeyValuePair<string, List<Socket>> pair in mIDToSubscribers)
{
pair.Value.Remove(client);
}
mClients.Remove(client);
}
socketsToRemove.Clear();
}
}
}
// Start another read
mWindowClosing.Reset();
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
mWindowClosing.WaitOne();
}
catch (Exception ex)
{
LogToTextBox(ex.ToString());
}
}
