public VaiListener(INamedPort namedPort, PortDataParser portDataParser, int lineTimeoutSeconds = 300)
{
NamedPort = namedPort;
PortDataParser = portDataParser;
lineTimeoutManager = new LineTimeoutManager(this);
lineTimeoutManager.LineIdleTimeout = TimeSpan.FromSeconds(lineTimeoutSeconds);
}
private void Listen()
{
while (IsListening)
{
// use Monitor to prevent possible exceptions when Disposing an active Listener
if (Monitor.TryEnter(NamedPort))
{
try
{
if (NamedPort.HasDataAvailable())
{
string msg = NamedPort.Read();
lineTimeoutManager.LastDataReceived = DateTimeEx.Now;
PortDataParser.AppendAndParse(msg);
}
}
finally {
Monitor.Exit(NamedPort);
}
}
}
}
private async void AcceptClientsAsync()
{
TcpClient tcpClient = null;
VaiListener listener = null;
try
{
while (KeepServerRunning && !cancellation.IsCancellationRequested)
{
// If you don't check for pending messages,
// and there have been at least one active connection,
// AcceptTcpClientAsync will throw a "cannot used disposed object exception"
// when tcpServer stops.
if (!socketServer.Pending())
{
Thread.Sleep(0);
continue;
}
//Accept the pending client connection and return a TcpClient object initialized for communication.
tcpClient = await socketServer.AcceptTcpClientAsync().WithWaitCancellation(cancellation.Token);
var tcpIpClient = new VaiTcpIpClient(tcpClient);
clients.Add(tcpIpClient);
if (enableClientListening)
{
var portDataParser = new PortDataParser(tcpIpClient);
listener = new VaiListener(tcpIpClient, portDataParser);
Debug.WriteLine("Adding listener " + tcpIpClient.RemoteSocketName);
listeners.Add(listener);
var t1 = new Task(() => listener.StartListening());
t1.Start();
}
}
}
// this exception may occur if there have been open connections
catch (ObjectDisposedException ex)
{
Debug.WriteLine("Exception in CheckForClient." + ex.Message);
Debug.Assert(true, ex.Message);
}
// this exception may occur if there have been open connections
catch (OperationCanceledException ex)
{
Debug.Assert(true, ex.Message);
Debug.WriteLine("Exception in CheckForClient." + ex.Message);
}
catch (Exception ex)
{
Debug.WriteLine("Exception in CheckForClient." + ex.Message);
Debug.Assert(false, ex.Message);
}
finally
{
listener?.Dispose();
if (!KeepServerRunning)
{
Debug.WriteLine("CheckForClient finally. keepServerRunning:" + KeepServerRunning);
}
}
}
