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Lazy Alternatives - LazyAndWeak and BackgroundLoader

, 1 Dec 2011 CPOL
This article will present two alternatives to Lazy.
LazyAlternatives
LazyAlternatives.suo
LazyAlternativesSample
Properties
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.Diagnostics.CodeAnalysis;
using System.Threading;
using Pfz.Threading;
using Pfz.Threading.Disposers;

namespace Pfz.Extensions
{
	/// <summary>
	/// Adds methods to use ReaderWriterLockSlim easily,
	/// always with time-outs to avoid dead-locks.
	/// See PfzLockConfiguration class if you want to log dead-locks.
	/// </summary>
	public static class PfzReaderWriterLockExtensions
	{
		#region IDisposable locks
			#region ReadLock
				/// <summary>
				/// Abort-unsafe version of read-lock.
				/// Must be disposed to release the lock.
				/// </summary>
				[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
				public static ReadLockDisposer ReadLock(this ReaderWriterLockSlim readerWriterLock)
				{
					if (readerWriterLock == null)
						throw new ArgumentNullException("readerWriterLock");

					ReadLockDisposer result = new ReadLockDisposer(readerWriterLock, Timeout.Infinite);
					return result;
				}
			
				/// <summary>
				/// Tries to acquire a read-lock on the given object using the default timeout. 
				/// If it fails, returns null.
				/// </summary>
				/// <param name="readerWriterLock">The object to lock.</param>
				/// <returns>A disposable object to release the lock, or null.</returns>
				public static ReadLockDisposer TryReadLock(this ReaderWriterLockSlim readerWriterLock)
				{
					return TryReadLock(readerWriterLock, LockConfiguration.DefaultLockTimeout);
				}
				
				/// <summary>
				/// Tries to acquire a read-lock on the given object using the specified timeout. 
				/// If it fails, returns null.
				/// </summary>
				/// <param name="readerWriterLock">The object to lock.</param>
				/// <param name="timeoutInMilliseconds">The timeout to try for the lock.</param>
				/// <returns>A disposable object to release the lock, or null.</returns>
				[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
				public static ReadLockDisposer TryReadLock(this ReaderWriterLockSlim readerWriterLock, int timeoutInMilliseconds)
				{
					if (readerWriterLock == null)
						throw new ArgumentNullException("readerWriterLock");

					ReadLockDisposer result = new ReadLockDisposer(readerWriterLock, timeoutInMilliseconds);
					if (result._readerWriterLock != null)
						return result;
					
					return null;
				}
			#endregion
			#region UpgradeableLock
				/// <summary>
				/// Abort-unsafe version of upgradeable-lock.
				/// Must be disposed to release the lock.
				/// </summary>
				[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
				public static UpgradeableLockDisposer UpgradeableLock(this ReaderWriterLockSlim readerWriterLock)
				{
					if (readerWriterLock == null)
						throw new ArgumentNullException("readerWriterLock");

					UpgradeableLockDisposer result = new UpgradeableLockDisposer(readerWriterLock, -1);
					return result;
				}

				/// <summary>
				/// Tries to acquire an upgradeable lock on the given object, using the default timeout.
				/// If it fails, returns null.
				/// </summary>
				/// <param name="readerWriterLock">The object to try to lock.</param>
				/// <returns>An disposable object to release the lock, or null if the locks fails.</returns>
				public static UpgradeableLockDisposer TryUpgradeableLock(this ReaderWriterLockSlim readerWriterLock)
				{
					return TryUpgradeableLock(readerWriterLock, LockConfiguration.DefaultLockTimeout);
				}
				
				/// <summary>
				/// Tries to acquire an upgradeable lock on the given object, using the specified timeout.
				/// If it fails, returns null.
				/// </summary>
				/// <param name="readerWriterLock">The object to try to lock.</param>
				/// <param name="timeoutInMilliseconds">The maximum time to wait for the lock.</param>
				/// <returns>An disposable object to release the lock, or null if the locks fails.</returns>
				[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
				public static UpgradeableLockDisposer TryUpgradeableLock(this ReaderWriterLockSlim readerWriterLock, int timeoutInMilliseconds)
				{
					if (readerWriterLock == null)
						throw new ArgumentNullException("readerWriterLock");

					UpgradeableLockDisposer result = new UpgradeableLockDisposer(readerWriterLock, timeoutInMilliseconds);
					if (result._readerWriterLock != null)
						return result;
					
					return null;
				}
			#endregion
			#region WriteLock
				/// <summary>
				/// Abort-unsafe version of write-lock.
				/// Must be disposed to release the lock.
				/// </summary>
				[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
				public static WriteLockDisposer WriteLock(this ReaderWriterLockSlim readerWriterLock)
				{
					if (readerWriterLock == null)
						throw new ArgumentNullException("readerWriterLock");

					WriteLockDisposer result = new WriteLockDisposer(readerWriterLock, -1);
					return result;
				}

				/// <summary>
				/// Tries to acquire a write-lock on the given object using the default timeout.
				/// If it fails, returns null.
				/// </summary>
				/// <param name="readerWriterLock">The object to lock.</param>
				/// <returns>A disposable object to release the lock, or null.</returns>
				public static WriteLockDisposer TryWriteLock(this ReaderWriterLockSlim readerWriterLock)
				{
					return TryWriteLock(readerWriterLock, LockConfiguration.DefaultLockTimeout);
				}
				
				/// <summary>
				/// Tries to acquire a write-lock on the given object using the specified timeout.
				/// If it fails, returns null.
				/// </summary>
				/// <param name="readerWriterLock">The object to lock.</param>
				/// <param name="timeoutInMilliseconds">The maximum time to wait for the lock.</param>
				/// <returns>A disposable object to release the lock, or null.</returns>
				[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
				public static WriteLockDisposer TryWriteLock(this ReaderWriterLockSlim readerWriterLock, int timeoutInMilliseconds)
				{
					if (readerWriterLock == null)
						throw new ArgumentNullException("readerWriterLock");

					WriteLockDisposer result = new WriteLockDisposer(readerWriterLock, timeoutInMilliseconds);
					if (result._readerWriterLock != null)
						return result;
					
					return null;
				}
			#endregion
		#endregion
	}
}

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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 hobbyist, 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 their 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 & 2016
Microsoft MVP 2013-2014 (now I work at Microsoft so I can't be a Microsoft MVP anymore)

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