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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;
using Pfz.Extensions;

namespace Pfz.Serialization.BinaryBuiltIn
{
	/// <summary>
	/// Helper class to get a typed ArraySerializer.
	/// </summary>
	public static class ArraySerializer
	{
		/// <summary>
		/// Gets an instantiated ArraySerializer for the given element type.
		/// </summary>
		public static IItemSerializer GetForElementType(Type elementType)
		{
			var serializerType = typeof(ArraySerializer<>).MakeGenericType(elementType);
			var instanceField = serializerType.GetField("Instance");
			var untypedInstance = instanceField.GetValue(null);
			var serializer = (IItemSerializer)untypedInstance;
			return serializer;
		}
	}

	/// <summary>
	/// Serializes any array using the pattern: Size + serialization of each item.
	/// </summary>
	/// <typeparam name="T"></typeparam>
	public sealed class ArraySerializer<T>:
		ItemSerializer<T[]>
	{
		/// <summary>
		/// Gets the singleton instance.
		/// </summary>
		public static readonly ArraySerializer<T> Instance = new ArraySerializer<T>();

		private ArraySerializer()
		{
		}

		/// <summary>
		/// Serializes the array.
		/// </summary>
		public override void Serialize(ConfigurableSerializerBase serializer, T[] array)
		{
			var stream = serializer.Stream;
			stream.WriteCompressedInt32(array.Length);
			foreach(var arrayItem in array)
				serializer.InnerSerialize(arrayItem, typeof(T));
		}

		/// <summary>
		/// Deserializes the array.
		/// </summary>
		public override T[] Deserialize(ConfigurableSerializerBase deserializer)
		{
			var stream = deserializer.Stream;
			int count = stream.ReadCompressedInt32();
			T[] result = new T[count];
			for(int i=0; i<count; i++)
			{
				object deserialized = deserializer.InnerDeserialize(typeof(T));
				SerializationReference reference = deserialized as SerializationReference;
				if (reference == null)
					result[i] = (T)deserialized;
				else
				{
					var filler = new ReferenceFiller();
					filler.result = result;
					filler.resultIndex = i;
					deserializer.FillReference(reference.ReferenceId, filler.Fill);
				}
			}

			return result;
		}

		private sealed class ReferenceFiller
		{
			internal int resultIndex;
			internal T[] result;

			internal void Fill(object resultItem)
			{
				result[resultIndex] = (T)resultItem;
			}
		}
	}
}

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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, 2015
Microsoft MVP 2013-2014

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