private SingleFileInfo GetOrUpdateFileInfo(string fullPath)
{
if (this.logFiles.TryGetValue(fullPath, out var logFileInfo))
{
if (logFileInfo.IsCurrentlyReading)
{
return(logFileInfo);
}
var createDate = File.GetCreationTimeUtc(fullPath);
if (logFileInfo.CreateDate != createDate)
{
logFileInfo.Dispose();
logFileInfo = new SingleFileInfo(fullPath);
this.logFiles.AddOrUpdate(fullPath, logFileInfo, (k, v) => logFileInfo);
Console.WriteLine($"Reload stream for {fullPath} with creation date {logFileInfo.CreateDate.ToString()}");
}
}
else
{
logFileInfo = new SingleFileInfo(fullPath);
logFiles.TryAdd(fullPath, logFileInfo);
Console.WriteLine($"Create stream for {fullPath}");
}
return(logFileInfo);
}
private void ReadFile(string fullPath)
{
SingleFileInfo logFileInfo = null;
lock (@lock)
{
try
{
logFileInfo = GetOrUpdateFileInfo(fullPath);
if (logFileInfo.IsCurrentlyReading)
{
return;
}
logFileInfo.IsCurrentlyReading = true;
}
catch (FileNotFoundException)
{
return; // sometimes file rotate and does not at this moment
}
}
try
{
var streamReader = logFileInfo.StreamReader;
string line = streamReader.ReadLine();
while (line != null)
{
eventCount++;
OnFile(fullPath, line);
line = streamReader.ReadLine();
}
}
catch (Exception ex)
{
Console.WriteLine($"Error while reading {fullPath}");
throw ex;
}
finally
{
logFileInfo.IsCurrentlyReading = false;
if (logFileInfo.CloseFileAfterRead)
{
logFileInfo.Dispose();
}
}
}