An Extension to the Enterprise Library Logging Application Block

//===============================================================================
// Microsoft patterns & practices Enterprise Library
// Logging Application Block
//===============================================================================
// Copyright � Microsoft Corporation.  All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===============================================================================

using System;
using System.Collections.Generic;
using System.Text;
using ManagementInstrumentation = System.Management.Instrumentation.Instrumentation;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder;
using Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation;
using Microsoft.Practices.EnterpriseLibrary.Logging.Properties;
using System.Diagnostics;

namespace Microsoft.Practices.EnterpriseLibrary.Logging.Instrumentation
{

	/// <summary>
	/// The instrumentation gateway when no instances of the objects from the block are involved.
	/// </summary>
	[EventLogDefinition("Application", "Enterprise Library Logging")]
	[CustomFactory(typeof(DefaultLoggingEventLoggerCustomFactory))]
	public class DefaultLoggingEventLogger : InstrumentationListener
	{
		private readonly IEventLogEntryFormatter eventLogEntryFormatter;

		/// <summary>
		/// Initializes a new instance of the <see cref="DefaultLoggingEventLogger"/> class, specifying whether 
		/// logging to the event log and firing WMI events is allowed.
		/// </summary>
		/// <param name="eventLoggingEnabled"><code>true</code> if writing to the event log is allowed, <code>false</code> otherwise.</param>
		/// <param name="wmiEnabled"><code>true</code> if firing WMI events is allowed, <code>false</code> otherwise.</param>
		public DefaultLoggingEventLogger(bool eventLoggingEnabled, bool wmiEnabled)
			: base((string)null, false, eventLoggingEnabled, wmiEnabled, null)
		{
			this.eventLogEntryFormatter = new EventLogEntryFormatter(Resources.BlockName);
		}

		/// <summary>
		/// Logs the occurrence of a configuration error for the Enterprise Library Logging Application Block through the 
		/// available instrumentation mechanisms.
		/// </summary>
		/// <param name="exception">The exception raised for the configuration error.</param>
		public void LogConfigurationError(Exception exception)
		{
			if (WmiEnabled) ManagementInstrumentation.Fire(new LoggingConfigurationFailureEvent(exception.Message));
			if (EventLoggingEnabled)
			{
				string entryText = eventLogEntryFormatter.GetEntryText(Resources.ConfigurationFailureLogging, exception);
				EventLog.WriteEntry(GetEventSourceName(), entryText, EventLogEntryType.Error);
			}
		}
	}
}