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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011 CPOL
This article will present two alternatives to Lazy.
LazyAlternatives.zip
LazyAlternatives
LazyAlternatives.suo
LazyAlternativesSample
Properties
Settings.settings
Pfz
Caching
Collections
DataTypes
DynamicObjects
Internal
Extensions
Factoring
Pfz.csproj.user
Pfz.Phone.csproj.user
Pfz.ruleset
Pfz.Silverlight.csproj.user
Pfz.snk
Pfz.suo
PhoneSpecific
Properties
Remoting
Instructions
Internal
Serializers
Udp
Serialization
BinaryBuiltIn
Threading
Contexts
Disposers
Unsafe
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;

namespace Pfz.Remoting
{
	/// <summary>
	/// TcpListener that implements IAdvancedDisposable and IListener interfaces.
	/// It also disposes all its active connections when it is itself disposed.
	/// </summary>
	public sealed class DisposableTcpListener:
		IConnectionListener<DisposableTcpConnection>
	{
		internal readonly object _lock = new object();
		internal HashSet<DisposableTcpConnection> _clients = new HashSet<DisposableTcpConnection>();
		private TcpListener _listener;
		private readonly bool _hasTcpDelay;
		private readonly int _receiveBufferSize;
		private readonly int _sendBufferSize;
		private readonly int _bufferedWriteStreamSize;
		/// <summary>
		/// Creates and configures a new DisposableTcpListener.
		/// </summary>
		/// <param name="address">The addess to listen.</param>
		/// <param name="port">The port to listen.</param>
		/// <param name="hasTcpDelay">If true, the TcpDelay (to avoid multiple small packets) is on.</param>
		/// <param name="bufferedWriteStreamSize">If different than -1 tells that a local BufferedWriteStream should be used by new connections.</param>
		/// <param name="receiveBufferSize">If different than -1 configures the Tcp Receive Buffer size.</param>
		/// <param name="sendBufferSize">If different than -1 configures the Tcp Send Buffer size.</param>
		public DisposableTcpListener(IPAddress address, int port, bool hasTcpDelay=true, int bufferedWriteStreamSize=-1, int receiveBufferSize=-1, int sendBufferSize=-1)
		{
			_hasTcpDelay = hasTcpDelay;
			_receiveBufferSize = receiveBufferSize;
			_sendBufferSize = sendBufferSize;
			_bufferedWriteStreamSize = bufferedWriteStreamSize;

			_listener = new TcpListener(address, port);
			_listener.Start();
		}

		/// <summary>
		/// Frees the internal listener and disposes all active clients.
		/// </summary>
		public void Dispose()
		{
			lock(_lock)
			{
				var listener = _listener;
				if (listener != null)
				{
					_listener = null;
					listener.Stop();
				}

				var clients = _clients;
				if (clients != null)
				{
					_clients = null;

					foreach(var client in clients)
						client.Dispose();
				}
			}
		}

		/// <summary>
		/// Gets a value indicating if this listener was disposed.
		/// </summary>
		public bool WasDisposed
		{
			get
			{
				return _listener == null;
			}
		}

		/// <summary>
		/// Tries to accept a new connection.
		/// </summary>
		public DisposableTcpConnection TryAccept()
		{
			try
			{
				var client = _listener.AcceptTcpClient();
				if (client == null)
					return null;

				try
				{
					client.NoDelay = !_hasTcpDelay;

					if (_receiveBufferSize != -1)
						client.ReceiveBufferSize = _receiveBufferSize;

					if (_sendBufferSize != -1)
						client.SendBufferSize = _sendBufferSize;

					Stream stream = client.GetStream();
					if (_bufferedWriteStreamSize != -1)
						stream = new BufferedWriteStream(stream, _bufferedWriteStreamSize);

					return new DisposableTcpConnection(this, client, stream);
				}
				catch
				{
					client.Close();
					throw;
				}
			}
			catch
			{
				if (!WasDisposed)
					throw;

				return null;
			}
		}

		/// <summary>
		/// Gets a copy array of all connected clients.
		/// </summary>
		public DisposableTcpConnection[] GetConnections()
		{
			lock(_lock)
			{
				var clients = _clients;
				if (clients == null)
					return null;

				return clients.ToArray();
			}
		}
	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Paulo Zemek
Engineer Microsoft Corporation
United States United States
I started to program computers when I was 11 years old, as a hobbist, 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 they work easier, faster and with less errors.
 
Now I just started working as a Senior Software Engineer at Microsoft.
 
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
Microsoft MVP 2013-2014

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