void CloseFile()
{
if (m_currentFile != null)
{
m_currentFile.Dispose();
m_currentFile = null;
}
m_nextCheckpoint = null;
}
void OpenFile(DateTime now)
{
var date = now.Date;
var latestFileForNow = EnumerateFiles().FirstOrDefault(v => v.Date == date);
var sequence = (latestFileForNow?.SequenceNumber ?? 0) + 1;
// Re-open the file on the next day.
m_nextCheckpoint = date.AddDays(1);
const int maxAttempts = 3;
for (var attempt = 0; attempt < maxAttempts; attempt++)
{
var newFileName = ConstructLogFilename(now, sequence);
try
{
m_currentFile = new SizedFileSink(newFileName, m_textFormatter, m_encoding);
}
catch (IOException ex)
{
var errorCode = Marshal.GetHRForException(ex) & ((1 << 16) - 1);
if (errorCode == 32 || errorCode == 33)
{
// "Rolling file target {0} was locked, attempting to open next in sequence (attempt {1})", newFileName, attempt + 1);
sequence++;
continue;
}
throw;
}
// Purge old files.
ApplyRetentionPolicy(now, newFileName);
return;
}
}
protected override bool ShouldRollFile(DateTime now, SizedFileSink currentFile)
{
// Close previous file if size reached.
return(m_fileSizeLimitBytes.HasValue && currentFile.EstimatedLength >= m_fileSizeLimitBytes.Value);
}
/// <summary> /// Return true if the current file should be closed. /// </summary> /// <param name="now">Time of the call</param> /// <param name="currentFile"></param> /// <returns></returns> protected abstract bool ShouldRollFile(DateTime now, SizedFileSink currentFile);