public ILogger CreateLogger(string categoryName)
{
if (categoryName == null)
{
throw new ArgumentNullException(nameof(categoryName));
}
if (!_loggers.TryGetValue(categoryName, out var logger))
{
logger = new DiaggregatorLogger(categoryName);
if (ReferenceEquals(_loggers.GetOrAdd(categoryName, logger), logger))
{
do
{
if (!_categoryNames.TryAdd(categoryName, true))
{
break;
}
var index = categoryName.LastIndexOf('.');
categoryName = index == -1 ? null : categoryName.Substring(0, index);
}while (categoryName != null);
}
}
return(logger);
}
private DiaggregatorLogger[] GetLoggers(string categoryName)
{
DiaggregatorLogger[] loggers;
var categoryNames = _loggerProvider.GetCategoryNames();
if (string.IsNullOrEmpty(categoryName))
{
loggers = new DiaggregatorLogger[categoryNames.Count];
for (var i = 0; i < categoryNames.Count; i++)
{
loggers[i] = (DiaggregatorLogger)_loggerProvider.CreateLogger(categoryNames[i]);
}
return(loggers);
}
var start = 0;
for (; start < categoryNames.Count; start++)
{
if (StringComparer.Ordinal.Compare(categoryName, categoryNames[start]) != 0)
{
break;
}
}
var end = start + 1;
for (; end < categoryNames.Count; end++)
{
if (!categoryNames[end].StartsWith(categoryName) ||
categoryNames[end].Length <= categoryName.Length &&
categoryNames[end][categoryName.Length] != '.')
{
break;
}
}
loggers = new DiaggregatorLogger[end - start];
for (var i = start; i < end; i++)
{
loggers[i - start] = (DiaggregatorLogger)_loggerProvider.CreateLogger(categoryNames[i]);
}
return(loggers);
}