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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using Pfz.Extensions;
using Pfz.Threading;
namespace Pfz.Remoting.Udp
{
/// <summary>
/// A listener of TcpWithUdpConnections.
/// </summary>
public sealed class GuaranteedUdpListener:
ThreadSafeExceptionAwareDisposable,
IUdpConnectionListener<GuaranteedUdpConnection>
{
internal Dictionary<IPEndPoint, GuaranteedUdpConnection> _connections = new Dictionary<IPEndPoint, GuaranteedUdpConnection>();
internal UdpClient _udp;
internal readonly int _pendingGuaranteedDeliveryCount;
internal readonly int _confirmImmediatelyCount;
/// <summary>
/// Creates a new instance of this class, setting the port to listen to and the number of Udp packets that must be sent before
/// waiting for a confirmation.
/// </summary>
public GuaranteedUdpListener(int port, int pendingGuaranteedDeliveryCount=57)
{
if (pendingGuaranteedDeliveryCount < 2)
throw new ArgumentException("pendingGuaranteedDeliveryCount must be at least 2.", "pendingGuaranteedDeliveryCount");
_pendingGuaranteedDeliveryCount = pendingGuaranteedDeliveryCount;
_confirmImmediatelyCount = pendingGuaranteedDeliveryCount/2;
_udp = new UdpClient(port);
UnlimitedThreadPool.Run(_KeepReceiving);
}
/// <summary>
/// Releases the listener.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_newConnectionsEvent != null)
_newConnectionsEvent.Dispose();
Disposer.Dispose(ref _udp);
var connections = _connections;
if (connections != null)
{
_connections = null;
foreach(var connection in connections.Values)
connection.Dispose();
}
}
base.Dispose(disposing);
}
private void _KeepReceiving()
{
try
{
while(true)
{
if (WasDisposed)
return;
IPEndPoint endpoint = null;
byte[] received;
try
{
received = _udp.Receive(ref endpoint);
}
catch(SocketException)
{
continue;
}
if (received == null)
return;
GuaranteedUdpConnection connection;
lock(DisposeLock)
{
if (WasDisposed)
return;
connection = _connections.GetValueOrDefault(endpoint);
if (connection == null)
{
_newConnectionsQueue.Enqueue(endpoint);
_newConnectionsEvent.Set();
continue;
}
}
connection._StoreReceived(received);
}
}
catch(Exception exception)
{
Dispose(exception);
}
finally
{
Dispose();
}
}
private readonly ManagedAutoResetEvent _newConnectionsEvent = new ManagedAutoResetEvent();
private Queue<IPEndPoint> _newConnectionsQueue = new Queue<IPEndPoint>();
/// <summary>
/// Tries to accept a new connection. May return null if the listener is disposed.
/// </summary>
public GuaranteedUdpConnection TryAccept()
{
while(true)
{
lock(DisposeLock)
{
if (WasDisposed)
return null;
if (_newConnectionsQueue.Count > 0)
{
var endpoint = _newConnectionsQueue.Dequeue();
if (_connections.ContainsKey(endpoint))
continue;
var result = new GuaranteedUdpConnection(this, endpoint);
try
{
_connections.Add(endpoint, result);
}
catch
{
result.Dispose();
throw;
}
return result;
}
}
_newConnectionsEvent.WaitOne();
}
}
/// <summary>
/// Gets a copy of all active connections at this moment.
/// </summary>
public GuaranteedUdpConnection[] GetConnections()
{
lock(DisposeLock)
{
if (WasDisposed)
return null;
return _connections.Values.ToArray();
}
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).