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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011
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;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net.Sockets;
using Pfz;
using Pfz.Phone.PhoneSpecific;
using System.Threading;

namespace System.Net.Sockets
{
	public sealed class NetworkStream:
		Stream
	{
		private readonly object _lock = new object();
		private TcpClient _connection;
		internal NetworkStream(TcpClient connection)
		{
			_connection = connection;
		}
		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
				lock(_lock)
				{
					Disposer.Dispose(ref _connection);
					_readBuffer = null;
				}
			}

			base.Dispose(disposing);
		}

		private byte[] _readBuffer = new byte[8*1024];
		private int _readPos = 0;
		private int _readLength = 0;
		public override int Read(byte[] buffer, int offset, int count)
		{
			TcpClient connection;

			while(true)
			{
				lock(_lock)
				{
					connection = _connection;
					if (connection == null)
						return 0;

					int remainingInBuffer = _readLength - _readPos;
					if (remainingInBuffer > 0)
					{
						if (remainingInBuffer > count)
							remainingInBuffer = count;

						Buffer.BlockCopy(_readBuffer, _readPos, buffer, offset, remainingInBuffer);
						_readPos += remainingInBuffer;
						return remainingInBuffer;
					}
				}

				bool lockTaken = false;
				try
				{
					Monitor.Enter(connection._lock, ref lockTaken);
					var socket = connection._socket;
					if (socket == null)
						return 0;

					using(connection._readArgs = new _SyncFromAsyncEventArgs())
					{
						connection._readArgs._args.SetBuffer(_readBuffer, 0, _readBuffer.Length);
						connection._socket.ReceiveAsync(connection._readArgs._args);

						try
						{
						}
						finally
						{
							lockTaken = false;
							Monitor.Exit(connection._lock);
						}

						if (!connection._WaitNoThrow(_readTimeout))
							return 0;

						_readLength = connection._readArgs._args.BytesTransferred;
						if (_readLength == 0)
							return 0;

						_readPos = 0;
					}
				}
				finally
				{
					if (lockTaken)
						Monitor.Exit(connection._lock);
				}
			}
		}
		public override void Write(byte[] buffer, int offset, int count)
		{
			var connection = _connection;
			if (connection == null)
				throw new ObjectDisposedException(GetType().FullName);

			lock(connection._lock)
			{
				var socket = connection._socket;
				if (socket == null)
					throw new ObjectDisposedException(GetType().FullName);

				using(connection._args = new _SyncFromAsyncEventArgs())
				{
					connection._args._args.SetBuffer(buffer, offset, count);
					socket.SendAsync(connection._args._args);
					connection._Wait(_writeTimeout);
				}
			}
		}

		public override bool CanRead
		{
			get
			{
				return true;
			}
		}

		public override bool CanSeek
		{
			get
			{
				return false;
			}
		}

		public override bool CanWrite
		{
			get
			{
				return true;
			}
		}

		public override void Flush()
		{
		}

		public override long Length
		{
			get
			{
				throw new NotSupportedException();
			}
		}

		public override long Position
		{
			get
			{
				throw new NotSupportedException();
			}
			set
			{
				throw new NotSupportedException();
			}
		}

		public override long Seek(long offset, SeekOrigin origin)
		{
			throw new NotSupportedException();
		}

		public override void SetLength(long value)
		{
			throw new NotSupportedException();
		}

		public override bool CanTimeout
		{
			get
			{
				return true;
			}
		}

		private int _readTimeout = Timeout.Infinite;
		public override int ReadTimeout
		{
			get
			{
				return _readTimeout;
			}
			set
			{
				_readTimeout = value;
			}
		}

		private int _writeTimeout = Timeout.Infinite;
		public override int WriteTimeout
		{
			get
			{
				return _writeTimeout;
			}
			set
			{
				_writeTimeout = value;
			}
		}
	}
}

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License

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

About the Author

Paulo Zemek
Architect
Canada Canada
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.
 
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

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