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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
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DynamicObjects
Internal
Extensions
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Pfz.csproj.user
Pfz.Phone.csproj.user
Pfz.ruleset
Pfz.Silverlight.csproj.user
Pfz.snk
Pfz.suo
PhoneSpecific
Properties
Remoting
Instructions
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Udp
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Unsafe
using System;
using System.IO;
using System.Windows;
using System.Windows.Threading;
using System.Threading;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using System.Windows.Media;
using Pfz.Caching;

namespace LazyAlternativesSample
{
	/// <summary>
	/// Interaction logic for MainWindow.xaml
	/// </summary>
	public partial class MainWindow : Window
	{
		private DispatcherTimer _timer = new DispatcherTimer();
		internal static MainWindow _instance;
		internal static readonly CollectableImageSource _emptyImage = new CollectableImageSource { ImageSource = BitmapImage.Create(1, 1, 96, 96, PixelFormats.Bgra32, null, new byte[4], 4) };

		public MainWindow()
		{
			_instance = this;
			InitializeComponent();

			_timer.Interval = TimeSpan.FromSeconds(1);
			_timer.Tick += new EventHandler(_timer_Tick);
			_timer.Start();

			var items = treeviewFolders.Items;
			foreach(var path in Directory.GetLogicalDrives())
			{
				var item = new PathItem(path);
				items.Add(item);
			}
		}
		protected override void OnClosed(EventArgs e)
		{
			foreach(ImageFromPath image in listboxFiles.Items)
				image._imageSourceLoader.Dispose();

			base.OnClosed(e);
		}

		void _timer_Tick(object sender, EventArgs e)
		{
			Title = "Lazy Alternatives Sample (Memory Use: " + GC.GetTotalMemory(false) / (1024 * 1024) + " MB)";
		}

		private void Button_Click(object sender, RoutedEventArgs e)
		{
			// Forcing two full collection, as LazyAndWeak by default survives to a single collection.
			GC.Collect();
			GC.WaitForPendingFinalizers();
			Thread.Sleep(100);

			GC.Collect();
			GC.WaitForPendingFinalizers();
			Thread.Sleep(100);

			foreach(ImageFromPath image in listboxFiles.Items)
			{
				image.InvalidateMeasure();
				image.InvalidateVisual();
			}
		}

		internal void _LoadFiles()
		{
			var filesItems = listboxFiles.Items;
			foreach(ImageFromPath item in filesItems)
				item._imageSourceLoader.Dispose();

			filesItems.Clear();

			var selectedNode = treeviewFolders.SelectedItem as PathItem;
			if (selectedNode == null)
				return;

			try
			{
				_AddFiles(selectedNode, "*.jpg");
				_AddFiles(selectedNode, "*.gif");
				_AddFiles(selectedNode, "*.bmp");
				_AddFiles(selectedNode, "*.png");
			}
			catch
			{
				// eat any exception.
			}
		}

		private void _AddFiles(PathItem selectedNode, string extension)
		{
			var filesItems = listboxFiles.Items;
			var files = Directory.EnumerateFiles(selectedNode.Path, extension);
			foreach(var file in files)
			{
				var item = new ImageFromPath(file);
				filesItems.Add(item);
			}
		}

		internal static ICreateLoader _createLoader;
		private void RadioButton_Checked(object sender, RoutedEventArgs e)
		{
			_createLoader = CreateBackgroundLoader.Instance;
			_LoadFiles();
		}

		private void RadioButton_Checked_1(object sender, RoutedEventArgs e)
		{
			_createLoader = CreateLazy.Instance;
			_LoadFiles();
		}

		private void RadioButton_Checked_2(object sender, RoutedEventArgs e)
		{
			_createLoader = CreateLazyAndWeak.Instance;
			_LoadFiles();
		}
	}
}

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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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