Catel - Part 4 of n: Unit testing with Catel

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Log4netHelper.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Log4net helper class.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using log4net.Appender;
using log4net.Core;
using log4net.Layout;
using log4net.Repository;
using log4net.Repository.Hierarchy;

namespace log4net
{
	/// <summary>
	/// Log4net helper class.
	/// </summary>
	public static class log4netHelper
	{
		#region Variables
        /// <summary>
        /// A value indicating whether the log is initialized.
        /// </summary>
		private static bool _initialized;
		#endregion

		/// <summary>
		/// Initializes the log. It creates a rolling file appender and console appender with
		/// default values.
		/// </summary>
		/// <param name="logFile">The log file.</param>
		/// <remarks>
		/// It is also possible to perform the initialization in the configuraton file.
		/// </remarks>
		public static void InitializeLog(string logFile)
		{
			if (_initialized)
			{
				return;
			}

			_initialized = true;

			foreach (ILoggerRepository repository in LogManager.GetAllRepositories())
			{
				InitializeRepository(repository, logFile);
			}
		}

		/// <summary>
		/// Initializes a hierarchy.
		/// </summary>
		/// <param name="repository">The repository.</param>
		/// <param name="logFile">The log file.</param>
		private static void InitializeRepository(ILoggerRepository repository, string logFile)
		{
			#region Trace
			// Create layout
			PatternLayout simplePatternLayout = new PatternLayout();
			simplePatternLayout.ConversionPattern = "%logger";
			simplePatternLayout.ActivateOptions();

			// Write everything to the trace
			TraceAppenderEx traceAppenderEx = new TraceAppenderEx();
			traceAppenderEx.Layout = simplePatternLayout;
			traceAppenderEx.ActivateOptions();
			#endregion

			#region Rolling file
			// Create layout
			PatternLayout extendedPatternLayout = new PatternLayout();
			extendedPatternLayout.Header = "[Application start]\r\n";
			extendedPatternLayout.Footer = "[Application end]\r\n\r\n\r\n";
			extendedPatternLayout.ConversionPattern = "%date - %-5level - %logger - %message%newline";
			extendedPatternLayout.ActivateOptions();

			RollingFileAppender fileAppender = new RollingFileAppender();
			fileAppender.File = logFile;
			fileAppender.StaticLogFileName = true;
			fileAppender.Layout = extendedPatternLayout;
			fileAppender.ImmediateFlush = true;
			fileAppender.RollingStyle = RollingFileAppender.RollingMode.Size;
			fileAppender.MaximumFileSize = "10MB";
			fileAppender.AppendToFile = true;
			fileAppender.MaxSizeRollBackups = 10;
			fileAppender.Threshold = Level.All;
			fileAppender.ActivateOptions();
			#endregion

			foreach (Logger log in repository.GetCurrentLoggers())
			{
				log.Additivity = true;
				log.AddAppender(traceAppenderEx);
				log.AddAppender(fileAppender);
			}

			repository.Configured = true;
		}
	}
}