public DefaultLoggerFactory(LogLevel filterLevel, string loggingDirectory)
{
this.filterLevel = filterLevel;
rollingLogger = new RollingLogger(loggingDirectory);
isDebugEnabled = LogLevel.Debug >= filterLevel;
isInfoEnabled = LogLevel.Info >= filterLevel;
isWarnEnabled = LogLevel.Warn >= filterLevel;
isErrorEnabled = LogLevel.Error >= filterLevel;
isFatalEnabled = LogLevel.Fatal >= filterLevel;
}