/// <summary>
/// It's the handler of the asynchronous reading.
/// </summary>
/// <param name="asyncResult">
/// It is the result of the asynchronous reading.
/// </param>
private void AsyncAcceptRequestHandler(IAsyncResult asyncResult)
{
if (asyncResult.AsyncState == _socket)
{
Socket socket = null;
lock (this) {
if (asyncResult.AsyncState == _socket)
{
if (!_listening)
{
// Someone called Close over socket. EndAccept and return.
try {
_socket.EndAccept(asyncResult);
} catch {
}
Monitor.Pulse(this);
return;
}
try {
// Accept connection.
socket = _socket.EndAccept(asyncResult);
} catch (Exception e) {
OnError(e);
return;
}
try {
// Start an asynchronous accept operation.
_socket.BeginAccept(new AsyncCallback(AsyncAcceptRequestHandler), _socket);
} catch (Exception e) {
Stop();
OnError(e);
}
}
}
if (socket == null)
{
return;
}
IChannel channel = null;
try {
if (socket.RemoteEndPoint == null)
{
NDC.Push(string.Format("{0}<-?", GetNDCName()));
}
else
{
NDC.Push(string.Format("{0}<-{1}", GetNDCName(), socket.RemoteEndPoint.ToString()));
}
if ((_channelPool != null) &&
OnConnectionRequest(socket.RemoteEndPoint))
{
channel = _channelPool.Remove();
if (channel == null)
{
if (Logger.IsInfoEnabled)
{
Logger.Info(string.Format(
"Connection request from {0}, not accepted because channel pool is empty.",
socket.RemoteEndPoint.ToString()));
}
// Can't get a channel for the new connection, close it.
socket.Shutdown(SocketShutdown.Both);
socket = null;
}
else
{
channel.BeginBind(socket);
}
}
else
{
if (Logger.IsInfoEnabled)
{
if (_channelPool == null)
{
Logger.Info(string.Format(
"Connection request from {0}, not accepted because channel pool is null.",
socket.RemoteEndPoint.ToString()));
}
else
{
Logger.Info(string.Format(
"Connection request from {0}, not accepted.",
socket.RemoteEndPoint.ToString()));
}
}
// Connection not accepted, close it.
socket.Shutdown(SocketShutdown.Both);
}
} catch (Exception e) {
try {
OnError(e);
socket.Shutdown(SocketShutdown.Both);
// Return channel to the pool.
if (channel != null)
{
_channelPool.Add(channel);
channel = null;
if (Logger.IsInfoEnabled)
{
Logger.Info(string.Format(
"Channel returned to pool, {0} channel/s remaining in channel pool.",
_channelPool.Length));
}
}
} catch {
}
} finally {
NDC.Pop();
}
if (channel != null)
{
try {
NDC.Push(string.Format("{0}<-{1}", GetNDCName(), socket.RemoteEndPoint.ToString()));
// It is necessary first to raise the event, and soon the EndBind. Doing this
// the components that receive the event can initialize before the channel
// begins to receive.
OnConnected(channel);
channel.EndBind();
} catch (Exception e) {
try {
channel.Close();
OnError(e);
// Return channel to the pool.
if (channel != null)
{
_channelPool.Add(channel);
channel = null;
if (Logger.IsInfoEnabled)
{
Logger.Info(string.Format(
"Channel returned to pool, {0} channel/s remaining in channel pool.",
_channelPool.Length));
}
}
} catch {
}
} finally {
NDC.Pop();
}
}
}
}