/// <summary>
/// Processes all in-comming client command requests.
/// </summary>
/// <param name="sender">The current server to client connection channel.</param>
/// <param name="commandSend">The command send by the client context.</param>
private void SocketServer_OnCommandSend(UdpServerContext sender, string commandSend)
{
try
{
// Clear last error.
ClearLastError();
// Process the command.
switch (commandSend.ToUpper())
{
case "DISCONNECT":
// End the client connection.
EndConnection(sender);
break;
case "RECEIVED":
// Server has received data from client.
// Signal to the blocking handler
// to un-block.
lock (_lockingObject)
{
_receivedData.Set();
}
break;
}
}
catch (Exception ex)
{
SetLastError(ex);
}
}
/// <summary>
/// Ends the current client connection.
/// </summary>
/// <param name="sender">The current server to client connection channel.</param>
private void EndConnection(UdpServerContext sender)
{
// Set the current client count.
DecrementCount();
// Signal to the blocking handler
// to un-block.
lock (_lockingObject)
_connAvailable.Set();
try
{
lock (_lockingObject)
{
// Send the new disconnection to the caller.
if (OnClientDisconnected != null)
{
OnClientDisconnected(this, sender);
}
}
}
catch { }
try
{
lock (_lockingObject)
{
// Attempt to release all the resources of the curretn server context.
sender.Dispose();
sender = null;
}
}
catch { }
}
/// <summary>
/// Create a new instance of the server context type.
/// </summary>
private void CreateServerContext()
{
UdpServerContext socketServerContext = null;
try
{
// Clear last error.
ClearLastError();
// Create a new instance of the server context type
socketServerContext = new UdpServerContext(_specificAddressFamily);
socketServerContext.Socket = _socket;
socketServerContext.Name = _serverName;
socketServerContext.ReceiveSocketFlags = _receiveSocketFlags;
socketServerContext.SendSocketFlags = _sendSocketFlags;
socketServerContext.SendToServerHandler = _sendToServerHandler;
socketServerContext.SendToServerInfoHandler = _sendToServerInfoHandler;
socketServerContext.ReadBufferSize = READ_BUFFER_SIZE;
socketServerContext.WriteBufferSize = WRITE_BUFFER_SIZE;
socketServerContext.ServerRef = this;
socketServerContext.Server = this;
// If a time out has been set.
if (_timeOut > 0)
{
socketServerContext.TimeOut = _timeOut;
}
// Create a new client data receive handler, this event
// handles commands from the current client.
socketServerContext.OnCommandSend +=
new UdpServerContextHandler(SocketServer_OnCommandSend);
// Initalise the context.
socketServerContext.Initialise();
// Increment the count.
IncrementCount();
try
{
// Send the new connection to the caller.
if (OnClientConnected != null)
{
OnClientConnected(this, socketServerContext);
}
}
catch { }
// Lock the socket receive process.
lock (LockingSocket)
{
// Start receiving data from the client.
_socket.BeginReceiveFrom(socketServerContext._readBuffer, 0, socketServerContext.ReadBufferSize,
socketServerContext.ReceiveSocketFlags, ref socketServerContext.RemoteClient,
new AsyncCallback(socketServerContext.DataReceiver), socketServerContext);
}
}
catch (Exception ex)
{
// Clean-up if error.
if (socketServerContext != null)
{
socketServerContext.Dispose();
}
socketServerContext = null;
SetLastError(ex);
}
}
