public void Update()
{
try {
if (client == null && pendingClient == null && port.IsOpen && port.BytesToRead > 0)
{
Logger.WriteLine(
"SerialIO.Server[" + Address + "]: client requesting connection",
Logger.Severity.Debug);
pendingClient = new ByteClient(port);
}
} catch (IOException) {
Stop();
} catch (TimeoutException) {
Stop();
} catch (ObjectDisposedException) {
Stop();
}
if (client == null && pendingClient != null)
{
// Trigger OnClientRequestingConnection events to verify the connection
var args = new ClientRequestingConnectionEventArgs <byte, byte> (pendingClient);
EventHandlerExtensions.Invoke(OnClientRequestingConnection, this, args);
// Deny the connection
if (args.Request.ShouldDeny)
{
Logger.WriteLine(
"SerialIO.Server[" + Address + "]: client connection denied",
Logger.Severity.Debug);
DisconnectClient(pendingClient, true);
pendingClient = null;
}
// Allow the connection
else if (args.Request.ShouldAllow)
{
client = pendingClient;
pendingClient = null;
Logger.WriteLine(
"SerialIO.Server[" + Address + "]: " +
"client connection accepted", Logger.Severity.Debug);
EventHandlerExtensions.Invoke(OnClientConnected, this, new ClientConnectedEventArgs <byte, byte> (client));
}
// Still pending, will either be denied or allowed on a subsequent called to Update
else
{
Logger.WriteLine(
"SerialIO.Server[" + Address + "]: " +
"client connection still pending", Logger.Severity.Debug);
}
}
else if (client != null && !client.Connected)
{
DisconnectClient(client);
client = null;
}
}
void Close()
{
if (client != null)
{
DisconnectClient(client);
client = null;
}
if (port != null)
{
port.Close();
port = null;
}
}
/// <summary>
/// Called by RPCStream.Read when a client sends a connection request message,
/// but another client is already connected.
/// </summary>
internal void ClientConnectionRequest(byte[] data)
{
if (client != null)
{
DisconnectClient(client);
client = null;
}
if (pendingClient != null)
{
DisconnectClient(pendingClient, true);
pendingClient = null;
}
Logger.WriteLine(
"SerialIO.Server[" + Address + "]: " +
"client requesting connection (overriding previous client connection)",
Logger.Severity.Debug);
pendingClient = new ByteClient(port, data);
}