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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;
using System.Collections.Generic;
using Pfz.Threading.Unsafe;

namespace Pfz.Threading
{
	/// <summary>
	/// This class is responsible for holding an UnsafeThreadedEnumerator.
	/// When disposed or collected it will release the thread used by such
	/// enumerator.
	/// </summary>
	public class ThreadedEnumerator<T>:
		DisposeAssurerBase<UnsafeThreadedEnumerator<T>>,
		IEnumerator<T>
	{
		/// <summary>
		/// Creates a new threaded enumerator from the given action.
		/// </summary>
		public static ThreadedEnumerator<T> CreateFromAction(EnumeratorAction<T> action)
		{
			return new _UnsafeThreadedEnumeratorFromAction<T>(action);
		}

		/// <summary>
		/// Creates a new ThreadedEnumerator from an unsafe one.
		/// </summary>
		protected ThreadedEnumerator(UnsafeThreadedEnumerator<T> unsafeEnumerator):
			base(unsafeEnumerator)
		{
			unsafeEnumerator._Start();
		}

		/// <summary>
		/// Implicit cast from UnsafeThreadedEnumerator to ThreadedEnumerator.
		/// </summary>
		public static implicit operator ThreadedEnumerator<T>(UnsafeThreadedEnumerator<T> unsafeEnumerator)
		{
			return new ThreadedEnumerator<T>(unsafeEnumerator);
		}

		/// <summary>
		/// Gets or sets a value indicating if the parallel limit should be applied (one threaded interator per cpu).
		/// </summary>
		public bool UseParallelLimit
		{
			get
			{
				var value = Value;
				if (value == null)
					return false;

				return value.UseParallelLimit;
			}
			set
			{
				var realObject = Value;
				if (realObject == null)
					throw new ObjectDisposedException(GetType().FullName);

				realObject.UseParallelLimit = value;
			}
		}

		/// <summary>
		/// Tells the enumerator to start the next step.
		/// </summary>
		public bool BeginUpdate()
		{
			var value = Value;
			if (value == null)
				throw new IteratorDisposedException(GetType().FullName);

			return value._BeginUpdate();
		}

		/// <summary>
		/// Wait until the next frame ends.
		/// </summary>
		public bool EndUpdate(out T result)
		{
			var value = Value;
			if (value == null)
				throw new IteratorDisposedException(GetType().FullName);

			return value._EndUpdate(out result);
		}

		/// <summary>
		/// Tells the enumerator to process the next step and wait for it.
		/// </summary>
		public bool Update(out T result)
		{
			var value = Value;
			if (value == null)
				throw new IteratorDisposedException(GetType().FullName);

			return value._Update(out result);
		}

		#region IEnumerator<T> Members
			private T _current;
			T IEnumerator<T>.Current
			{
				get
				{
					return _current;
				}
			}
		#endregion
		#region IEnumerator Members
			object IEnumerator.Current
			{
				get
				{
					return _current;
				}
			}

			bool IEnumerator.MoveNext()
			{
				return Update(out _current);
			}

			void IEnumerator.Reset()
			{
				throw new NotSupportedException("Threaded enumerators are not resetable.");
			}

		#endregion
	}
}

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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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