public bool Connect(string host, int port)
{
lock (initializationLock)
{
if (IsConnected())
{
Close();
}
try
{
socket = new TcpClient(host, port);
//notify connection change
if (null != connectionListener)
{
connectionListener.OnGazeApiConnectionStateChanged(socket.Connected);
}
incomingStreamHandler = new IncomingStreamHandler(socket, responseListener, connectionListener, this);
incomingStreamHandler.Start();
outgoingStreamHandler = new OutgoingStreamHandler(socket, requestQueue, connectionListener, this);
outgoingStreamHandler.Start();
}
catch (SocketException se)
{
Debug.WriteLine("Unable to open socket. Is Tracker Server running? Exception: " + se.Message);
//notify connection change
if (null != connectionListener)
{
connectionListener.OnGazeApiConnectionStateChanged(false);
}
Close();
return(false);
}
catch (Exception e)
{
Debug.WriteLine("Exception while establishing socket connection. Is Tracker Server running? Exception: " + e.Message);
Close();
return(false);
}
return(true);
}
}
private void Work()
{
try
{
string request = string.Empty;
writer = new StreamWriter(socket.GetStream(), Encoding.ASCII);
//while waiting for queue to populate and thread not killed
while (isRunning)
{
try
{
request = blockingOutQueue.Dequeue();
writer.WriteLine(request);
writer.Flush();
if (numWriteAttempt > 0)
{
numWriteAttempt = 0;
}
}
catch (IOException ioe)
{
//Has writing to socket failed and may server be disconnected?
if (numWriteAttempt++ >= NUM_WRITE_ATTEMPTS_BEFORE_FAIL)
{
//notify connection listener if any
if (null != connectionListener)
{
connectionListener.OnGazeApiConnectionStateChanged(false);
}
//server must be disconnected, shut down network layer
networkLayer.Close();
}
else
{
//else retry request asap
blockingOutQueue.Enqueue(request);
}
}
catch (Exception e)
{
Debug.WriteLine("Exception while writing to socket: " + e.Message);
}
}
}
catch (Exception e)
{
Debug.WriteLine("Exception while establishing outgoing socket connection: " + e.Message);
}
finally
{
Debug.WriteLine("OutgoingStreamHandler closing down");
}
}
private void Work()
{
try
{
reader = new StreamReader(socket.GetStream(), Encoding.ASCII);
while (isRunning)
{
try
{
while (!reader.EndOfStream)
{
string response = reader.ReadLine();
if (null != responseListener && !string.IsNullOrEmpty(response))
{
responseListener.OnGazeApiResponse(response);
}
}
}
catch (IOException ioe)
{
//Are we closing down or has reading from socket failed?
if (isRunning && !IsSocketConnected())
{
//notify connection listener if any
if (null != connectionListener)
{
connectionListener.OnGazeApiConnectionStateChanged(false);
}
//server must be disconnected, shut down network layer
networkLayer.Close();
}
}
catch (Exception e)
{
Debug.WriteLine("Exception while reading from socket: " + e.Message);
}
}
}
catch (Exception e)
{
Debug.WriteLine("Exception while establishing incoming socket connection: " + e.Message);
}
finally
{
Debug.WriteLine("IncommingStreamHandler closing down");
}
}