private void AddLines(FixedSizeList <long> buffer, Percentage percentageProcessed, long lastLineOffsetStreamPosition)
{
int?lineIndexToInvalidate = null;
int count;
lock (_index)
{
if (_index.Count > 0)
{
var lastLineIndex = _index.Count - 1;
if (_index[lastLineIndex].GetValue(LineOffsetInBytes) == lastLineOffsetStreamPosition)
{
lineIndexToInvalidate = lastLineIndex;
}
}
if (buffer.Count > 0)
{
//if (buffer.Buffer[0] != lastLineOffsetStreamPosition)
//{
// var lastLineIndex = _index.Count - 1;
// lineIndexToInvalidate = lastLineIndex;
//}
for (int i = 0; i < buffer.Count; ++i)
{
_index.Add(CreateLogEntry(buffer.Buffer[i]));
}
_lastLineOffsetStreamPosition = buffer.Buffer[buffer.Count - 1];
buffer.Clear();
}
count = _index.Count;
}
if (lineIndexToInvalidate != null)
{
_listeners.Remove(lineIndexToInvalidate.Value, 1);
}
_propertiesBuffer.SetValue(Core.Properties.PercentageProcessed, percentageProcessed);
UpdateLineCount(count);
}
private bool ReadEntireFile(CancellationToken cancellationToken)
{
if (!HasFileChanged(out var currentFingerprint, out var previousFingerprint))
{
if (Log.IsDebugEnabled)
{
Log.DebugFormat("File {0} remains unchanged (Fingerprint: {1}), nothing to do...", _fileName, currentFingerprint);
}
return(false);
}
var start = DateTime.UtcNow;
if (Log.IsDebugEnabled)
{
Log.DebugFormat("File {0} change detected (Fingerprint: {1}), scanning for new lines...", _fileName, currentFingerprint);
}
if (previousFingerprint?.Size > currentFingerprint.Size)
{
if (Log.IsDebugEnabled)
{
Log.DebugFormat("File {0} size reduced from {1}bytes to {2} bytes, starting all over", _fileName, previousFingerprint.Size, currentFingerprint.Size);
}
Clear();
}
using (var stream = new FileStream(_fileName,
FileMode.Open,
FileAccess.Read,
FileShare.ReadWrite | FileShare.Delete))
{
_propertiesBuffer.SetValue(Core.Properties.EmptyReason, null);
var startOffset = _lastLineOffsetStreamPosition;
if (startOffset == 0)
{
AddFirstLineIfNecessary(stream);
}
else
{
stream.Position = startOffset;
}
var detector = new LineOffsetDetector(stream, _encoding);
var buffer = new FixedSizeList <long>(1000);
long lineOffset;
while ((lineOffset = detector.FindNextLineOffset()) >= 0)
{
if (cancellationToken.IsCancellationRequested)
{
return(false);
}
if (!buffer.TryAdd(lineOffset))
{
AddLines(buffer, Percentage.Of(stream.Position, currentFingerprint.Size), startOffset);
buffer.TryAdd(lineOffset);
}
}
AddLines(buffer, Percentage.HundredPercent, startOffset);
_lastStreamPosition = stream.Position;
}
if (Log.IsDebugEnabled)
{
var elapsed = DateTime.UtcNow - start;
Log.DebugFormat("File {0} scan finished, took: {1:F1}ms", _fileName, elapsed.TotalMilliseconds);
}
return(true);
}
