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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011 CPOL 10.6K 305 25
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.IO;
using System.Threading;

namespace Pfz.Remoting
{
	/// <summary>
	/// This class provides buffered write operations, but non-buffered read operations.
	/// For TCP/IP operations with NoDelay set to true, it will be bettern than using a normal BufferedStream, because
	/// you can do reads and writes at the same time (which causes errors in BufferedStream class, as the buffer is shared)
	/// and will also be faster, as TCP/IP already has a read buffer. In fact, this class is only needed because
	/// there is no way to control TCP/IP to only send its buffered bytes by a "flush" command.
	/// </summary>
    public class BufferedWriteStream:
        Stream
    {
        private byte[] _buffer;
        private int _bufferPos;

		/// <summary>
		/// Creates a new BufferedStream over the given baseStream and with the specified bufferSize.
		/// </summary>
        public BufferedWriteStream(Stream baseStream, int bufferSize)
        {
			if (baseStream == null)
				throw new ArgumentNullException("baseStream");

			if (bufferSize < 256)
				throw new ArgumentException("bufferSize must be at least 256 bytes.", "bufferSize");

            _stream = baseStream;
            _buffer = new byte[bufferSize];
        }

		/// <summary>
		/// Disposes the baseStream and nullifies the buffer.
		/// </summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                var stream = _stream;
                if (stream != null)
				{
					_stream = null;
					stream.Dispose();
				}

				_buffer = null;
            }

            base.Dispose(disposing);
        }

        private Stream _stream;
		/// <summary>
		/// Gets the BaseStream to which the data will be written.
		/// </summary>
		public Stream BaseStream
		{
			get
			{
				return _stream;
			}
		}

		/// <summary>
		/// Gets or sets the BufferSize used by this BufferedWriteStream.
		/// </summary>
		public int BufferSize
		{
			get
			{
				return _buffer.Length;
			}
			set
			{
				if (value < 256)
					throw new ArgumentException("BufferSize can't be less than 256.");

				Flush();
				_buffer = new byte[value];
			}
		}

		/// <summary>
		/// Gets the BaseStream.CanRead.
		/// </summary>
        public override bool CanRead
        {
            get { return _stream.CanRead; }
        }

		/// <summary>
		/// Always returns false.
		/// </summary>
        public override bool CanSeek
        {
            get { return false; }
        }

		/// <summary>
		/// Gets the BaseStream.CanWrite.
		/// </summary>
        public override bool CanWrite
        {
            get { return _stream.CanWrite; }
        }

		/// <summary>
		/// Flushes any pending write and also calls the BaseStream.Flush.
		/// </summary>
        public override void Flush()
        {
            if (_bufferPos > 0)
            {
                _stream.Write(_buffer, 0, _bufferPos);
                _bufferPos = 0;
            }

            _stream.Flush();
        }

		/// <summary>
		/// Gets the BaseStream.Length, but this is likely to throw an exception.
		/// </summary>
        public override long Length
        {
            get { return _stream.Length; }
        }

		/// <summary>
		/// Throws a NotSupportedException.
		/// </summary>
        public override long Position
        {
            get
            {
                throw new NotSupportedException();
            }
            set
            {
                throw new NotSupportedException();
            }
        }

		/// <summary>
		/// Redirects the call to BaseStream.Read.
		/// </summary>
        public override int Read(byte[] buffer, int offset, int count)
        {
            return _stream.Read(buffer, offset, count);
        }

		/// <summary>
		/// Throws a NotSupportedException.
		/// </summary>
        public override long Seek(long offset, SeekOrigin origin)
        {
            throw new NotSupportedException();
        }

		/// <summary>
		/// Calls the BaseStream.SetLength, but this is likely to throw an exception.
		/// </summary>
        public override void SetLength(long value)
        {
            _stream.SetLength(value);
        }

		/// <summary>
		/// Tries to buffer a write. If the buffer is filled or if the data to be sent is greater than the buffer,
		/// Flushes this object, and writes the new data directly.
		/// </summary>
        public override void Write(byte[] buffer, int offset, int count)
        {
            if (buffer == null)
                throw new ArgumentNullException("buffer");

            if (offset < 0)
                throw new ArgumentException("offset can't be less than zero.", "offset");

            if (count == 0)
                return;

            if (count < 0)
                throw new ArgumentException("count can't be less than zero.", "count");

            if (offset + count > buffer.Length)
                throw new ArgumentException("offset + count are greater than buffer length.");

            int bufferSize = _buffer.Length;
            if (count >= bufferSize)
            {
                if (_bufferPos > 0)
                {
                    _stream.Write(_buffer, 0, _bufferPos);
                    _bufferPos = 0;
                }

                _stream.Write(buffer, offset, count);
                return;
            }

            int remaining = bufferSize - _bufferPos;

            int copySize = count;
            if (copySize > remaining)
                copySize = remaining;

            Buffer.BlockCopy(buffer, offset, _buffer, _bufferPos, copySize);

            _bufferPos += copySize;
            if (_bufferPos == bufferSize)
            {
                _stream.Write(_buffer, 0, bufferSize);
                _bufferPos = 0;

                int diff = count - copySize;
                if (diff > 0)
                {
                    Buffer.BlockCopy(buffer, offset + copySize, _buffer, 0, diff);
                    _bufferPos = diff;
                }
            }
        }

		/// <summary>
		/// Returns BaseStream.CanTimeout
		/// </summary>
        public override bool CanTimeout
        {
            get
            {
                return _stream.CanTimeout;
            }
        }

		/// <summary>
		/// Gets or sets BaseStream.ReadTimeout
		/// </summary>
        public override int ReadTimeout
        {
            get
            {
                return _stream.ReadTimeout;
            }
            set
            {
                _stream.ReadTimeout = value;
            }
        }

		/// <summary>
		/// Gets or sets BaseStream.WriteTimeout
		/// </summary>
        public override int WriteTimeout
        {
            get
            {
                return _stream.WriteTimeout;
            }
            set
            {
                _stream.WriteTimeout = value;
            }
        }
    }
}

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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, 2015
Microsoft MVP 2013-2014

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