public TraceEventSink(string fileName, Func <TraceEvent, string> messageFormatter, Encoding encoding, bool autoFlush)
{
this.asyncFileWriter = new AsyncFileWriter(nameof(FileSink), fileName, encoding, autoFlush);
this.messageFormatter = messageFormatter;
this.onNext = OnNext;
}
protected void CheckFileRolling()
{
var now = DateTime.Now;
string ts;
try
{
ts = timestampPattern(now);
}
catch (Exception ex)
{
EtwStreamEventSource.Log.SinkError(nameof(RollingFileSink), "timestampPattern convert failed", ex.ToString());
return;
}
// needs to create next file
var disposeTarget = asyncFileWriter;
if (disposeTarget == null || ts != currentTimestampPattern || disposeTarget?.CurrentStreamLength >= rollSizeInBytes)
{
lock (newFileLock)
{
if (this.asyncFileWriter == disposeTarget)
{
int sequenceNo = 0;
if (disposeTarget != null)
{
sequenceNo = ExtractCurrentSequence(asyncFileWriter.FileName) + 1;
}
string fn = null;
while (true)
{
try
{
var newFn = fileNameSelector(now, sequenceNo);
if (fn == newFn)
{
EtwStreamEventSource.Log.SinkError(nameof(RollingFileSink), "fileNameSelector indicate same filname", "");
return;
}
fn = newFn;
}
catch (Exception ex)
{
EtwStreamEventSource.Log.SinkError(nameof(RollingFileSink), "fileNamemessageFormatter convert failed", ex.ToString());
return;
}
var fi = new FileInfo(fn);
if (fi.Exists)
{
if (fi.Length >= rollSizeInBytes)
{
sequenceNo++;
continue;
}
}
break;
}
string[] safe;
try
{
safe = disposeTarget?.Finalize(); // block!
}
catch (Exception ex)
{
EtwStreamEventSource.Log.SinkError(nameof(RollingFileSink), "Can't dispose fileStream", ex.ToString());
return;
}
try
{
asyncFileWriter = new AsyncFileWriter(nameof(RollingFileSink), fn, encoding, autoFlush);
currentTimestampPattern = ts;
if (safe != null)
{
foreach (var item in safe)
{
asyncFileWriter.Enqueue(item);
}
}
}
catch (Exception ex)
{
EtwStreamEventSource.Log.SinkError(nameof(RollingFileSink), "Can't create FileStream", ex.ToString());
return;
}
}
}
}
}
public StringSink(string fileName, Encoding encoding, bool autoFlush)
{
this.asyncFileWriter = new AsyncFileWriter(nameof(FileSink), fileName, encoding, autoFlush);
this.onNext = OnNext;
}