LogFile.cs #1

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/*******************************************************************************
 * Name		: LogFile.cs
 *
 * Author	: dbb
 *
 * Description	: Classes used to log diagnostic messages.
 *
 ******************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace Perforce.P4
{
    /// <summary>
    /// Generic interface used to an event logger. In short, messages are
    /// logged by:
    /// 1) Level. The lower the level, the more sever the level,
    ///     0   fatal
    ///     1   error
    ///     2   warning
    ///     3   information
    ///     4+  debugging messages
    /// 2) Source. A string specifying the origin of the message, ie P4Server
    /// 3) Message. The text of the message.
    /// </summary>
    public class LogFile
    {
        public delegate void LogMessageDelgate( int log_level,
                                                String source,
                                                String message );

        public static LogMessageDelgate ExternalLogFn;

        public static void SetLoggingFunction( LogMessageDelgate logFn)
        {
            ExternalLogFn = logFn;
        }

        public static void LogMessage(  int log_level,
                                        String source,
                                        String message )
        {
            try
            {
                if (ExternalLogFn != null)
                {
                    // use user supplied external logging function
                    ExternalLogFn(log_level, source, message);
                    return;
                }
            }
            catch {} // never fail because of an error writing a log message

            DateTime now = DateTime.Now;
            String msg = String.Format("[{0}:{1}] {2} : {3}", 
                log_level, source,  now.ToString("dd/MM/yyyy HH:mm:ss.ffff"), message);

            // TODO: Implement an internal logging function
        }

        public static void LogException( String category, Exception ex)
        {
            try
            {

                String msg = String.Format("{0}:{1}\r\n{2}",
                    ex.GetType().ToString(),
                    ex.Message,
                    ex.StackTrace);
                LogMessage(0, category, msg);

				if (ex.InnerException != null)
					LogException("Inner Exception", ex.InnerException);

				P4Exception p4ex = ex as P4Exception;
				if ((p4ex != null) && (p4ex.NextError != null))
				{
					LogException("Next Exception", p4ex.NextError);
				}
			}
            catch { } // never fail because of an error writing a log message
        }

    }
}