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using System;
using System.IO;
using Pfz.Extensions;
using Pfz.Threading;
namespace Pfz.Remoting.Udp
{
/// <summary>
/// TcpIp connection that has an UDP connection bound to it, so you can opt to send guaranteed and ordered packets or
/// udp (optional) packets. Also allows you to configure it so it can use a guaranteed udp version, in which case
/// packets are unordered, but are guaranteed to arrive.
/// </summary>
public sealed class TcpWithUdpConnection:
ThreadSafeDisposable,
IConnection,
IGuaranteedUdpConnection
{
private TcpWithUdpListener _listener;
private DisposableTcpConnection _connection;
private GuaranteedUdpConnection _udp;
/// <summary>
/// Creates and configures a new TcpWithUdpConnection instance.
/// </summary>
public TcpWithUdpConnection(string hostname, int port, bool useTcpDelay=true, int bufferedWriteStreamSize=-1, int pendingGuaranteedDeliveryCount=57)
{
try
{
_udp = new GuaranteedUdpConnection(hostname, port+1, pendingGuaranteedDeliveryCount);
var startedEvent = new ManagedManualResetEvent();
byte[] bytes = null;
UnlimitedThreadPool.Run
(
() =>
{
try
{
bytes = _udp.UdpReceive();
}
catch
{
Dispose();
}
finally
{
startedEvent.Set();
}
}
);
if (!startedEvent.WaitOne(60000))
throw new TimeoutException("UDP handshaking timed-out.");
if (bytes == null)
throw new IOException("Can't stablish UDP connection.");
if (bytes.Length != _udp.UdpHeaderSize + 16)
throw new IOException("The other side sent an invalid handshaking packet.");
_connection = new DisposableTcpConnection(hostname, port, useTcpDelay, bufferedWriteStreamSize);
var stream = _connection.Stream;
stream.Write(bytes, _udp.UdpHeaderSize);
stream.Flush();
}
catch
{
Dispose();
throw;
}
}
internal TcpWithUdpConnection(TcpWithUdpListener listener, DisposableTcpConnection connection, GuaranteedUdpConnection udp)
{
_listener = listener;
_connection = connection;
_udp = udp;
}
/// <summary>
/// Releases the tcp and udp connections.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
var listener = _listener;
if (listener != null)
{
_listener = null;
lock(listener.DisposeLock)
if (!listener.WasDisposed)
listener._activeConnections.Remove(this);
}
Disposer.Dispose(ref _connection);
Disposer.Dispose(ref _udp);
}
base.Dispose(disposing);
}
/// <summary>
/// Gets the local endpoint.
/// </summary>
public string LocalEndpoint
{
get
{
var connection = _connection;
if (connection == null)
return null;
return connection.LocalEndpoint;
}
}
/// <summary>
/// Gets the remote endpoint.
/// </summary>
public string RemoteEndpoint
{
get
{
var connection = _connection;
if (connection == null)
return null;
return connection.RemoteEndpoint;
}
}
/// <summary>
/// Gets or sets the stream used for the ordered (tcp/ip) communication.
/// </summary>
public Stream Stream
{
get
{
var connection = _connection;
if (connection == null)
return null;
return connection.Stream;
}
set
{
lock(DisposeLock)
{
CheckUndisposed();
_connection.Stream = value;
}
}
}
/// <summary>
/// Sends an UDP packet. This packet can be lost.
/// </summary>
public void UdpSend(byte[] buffer, int offset, int count)
{
lock(DisposeLock)
{
CheckUndisposed();
_udp.UdpSend(buffer, offset, count);
}
}
/// <summary>
/// Receives an UDP packet. Note that it may include a header, so check the UdpHeaderSize property.
/// </summary>
public byte[] UdpReceive()
{
var udp = _udp;
if (udp == null)
return null;
return udp.UdpReceive();
}
/// <summary>
/// Gets the size of the header added to all packets.
/// </summary>
public int UdpHeaderSize
{
get
{
var udp = _udp;
if (udp == null)
return 0;
return udp.UdpHeaderSize;
}
}
/// <summary>
/// Sends a message with guarantee of delivery. It does not guarantees the order, however.
/// </summary>
public void GuaranteedSend(byte[] buffer, int offset, int count)
{
lock(DisposeLock)
{
CheckUndisposed();
_udp.GuaranteedSend(buffer, offset, count);
}
}
/// <summary>
/// Checks if a packet was sent as guaranteed (true) or not.
/// </summary>
public bool IsGuaranteedPacket(byte[] packet)
{
lock(DisposeLock)
{
CheckUndisposed();
return _udp.IsGuaranteedPacket(packet);
}
}
}
}
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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).