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WPF Control Factory

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20 Apr 2010CPOL6 min read 37.5K   418   16  
This article explains some advantages and disadvantages of factories, and shows one to use for generating WPF Controls.
using System;
using System.Diagnostics;
using System.IO;

namespace Pfz.Threading
{
	/// <summary>
	/// This class only configures what to do when a dead-lock occurs while
	/// acquiring a lock with PfzMonitorLockExtensions or with 
	/// PfzReaderWriterLockExtensions.
	/// </summary>
	public static class LockConfiguration
	{
		#region LockType enum
			/// <summary>
			/// Enum used to identify which type of lock has dead-locked when
			/// invoking DeadLocked event.
			/// </summary>
			public enum LockType
			{
				/// <summary>
				/// A monitor lock has dead-locked. (LockWithTimeout method).
				/// </summary>
				Monitor,
				
				/// <summary>
				/// A read-lock has dead-locked.
				/// </summary>
				Read,
				
				/// <summary>
				/// An upgradeable-read-lock has dead-locked.
				/// </summary>
				Upgradeable,
				
				/// <summary>
				/// A write-lock has dead-locked.
				/// </summary>
				Write
			}
		#endregion
		#region TimedOutEventArgs
			/// <summary>
			/// Class used as argument of the TimedOut event.
			/// </summary>
			[Serializable]
			public sealed class TimedOutEventArgs:
				EventArgs
			{
				internal TimedOutEventArgs(LockType lockType)
				{
					LockType = lockType;
				}
				
				/// <summary>
				/// The LockType that caused the timeout.
				/// </summary>
				public LockType LockType { get; private set; }
			}
		#endregion
		#region TimedOut event
			/// <summary>
			/// This event is invoked when any of the Locking extensions
			/// times-out (probably by a dead-lock).
			/// </summary>
			public static event EventHandler<TimedOutEventArgs> TimedOut;
		#endregion
		
		#region DefaultLockTimeout
			private static TimeSpan fDefaultLockTimeout = new TimeSpan(0, 1, 0);
			
			/// <summary>
			/// Gets or sets the default timeout for LockWithTimeout method.
			/// </summary>
			public static TimeSpan DefaultLockTimeout
			{
				get
				{
					return fDefaultLockTimeout;
				}
				set
				{
					if (value < TimeSpan.Zero)
						throw new ArgumentException("DefaultLockTimeout must be greater or equal to zero.");
						
					fDefaultLockTimeout = value;
				}
			}
		#endregion
		#region LockTimedOutLogPath
			private static string fLockTimedOutLogPath = "C:\\Temp\\PfzLockExtensions_TimedOut\\";
			
			/// <summary>
			/// Gets or sets a directory path in with log files will be generated when/if
			/// LockWithTimeout times out.
			/// </summary>
			public static string LockTimedOutLogPath
			{
				get
				{
					return fLockTimedOutLogPath;
				}
				set
				{
					if (value != null)
					{
						if (value == "")
							throw new ArgumentException("LockTimedOutLogPath can't be an empty string.");
							
						if (value[value.Length-1] != '\\')
							value += '\\';
					}
					
					fLockTimedOutLogPath = value;
				}
			}
		#endregion
		
		#region i_LockTimedOut
			internal static void i_LockTimedOutNoException(LockType lockType)
			{
				var logPath = fLockTimedOutLogPath;
				if (logPath != null)
				{
					try
					{
						if (!Directory.Exists(logPath))
							Directory.CreateDirectory(logPath);
						
						DateTime now = DateTime.Now;
						string filePath = logPath + now.ToString("yyyy-MM-dd") + ".log";
						
						var stackTrace = new StackTrace();
						File.AppendAllText(filePath, now.ToString("HH:mm:ss") + " " + lockType + "\r\n" + stackTrace.ToString() + "\r\n\r\n");
					}
					catch
					{
					}
				}
			
				var timedOut = TimedOut;
				if (timedOut != null)
				{
					TimedOutEventArgs args = new TimedOutEventArgs(lockType);
					timedOut.Invoke(null, args);
				}
			}
			internal static TimeoutException i_LockTimedOutException(LockType lockType)
			{
				i_LockTimedOutNoException(lockType);
				
				return new TimeoutException(string.Format("Timed out while acquiring a \"{0}\" lock.", lockType.ToString()));
			}
		#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)


Written By
Software Developer (Senior) Microsoft
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.

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 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).

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