public IReadOnlyList <MergedLogLineIndex> Get(LogFileSection section)
{
var indices = new MergedLogLineIndex[section.Count];
lock (_syncRoot)
{
if (section.Index.Value < _indices.Count)
{
var count = Math.Min((section.Index + section.Count).Value, _indices.Count);
_indices.CopyTo(section.Index.Value, indices, 0, count);
for (var i = 0; i < section.Count - count; ++i)
{
indices[section.LastIndex + i] = MergedLogLineIndex.Invalid;
}
}
else
{
for (var i = 0; i < section.Count; ++i)
{
indices[i] = MergedLogLineIndex.Invalid;
}
}
}
return(indices);
}
private static bool IsSameLogEntry(MergedLogLineIndex lhs, MergedLogLineIndex rhs)
{
// Two log lines refer to the same entry if they are from the SAME source
// AND if they have the same ORIGINAL log entry index.
if (lhs.LogFileIndex != rhs.LogFileIndex)
{
return(false);
}
return(lhs.OriginalLogEntryIndex == rhs.OriginalLogEntryIndex);
}
private LogEntryIndex CalculateLogEntryIndexFor(int insertionIndex, MergedLogLineIndex index)
{
if (insertionIndex > 0)
{
var previousIndex = _indices[insertionIndex - 1];
if (IsSameLogEntry(previousIndex, index))
{
return(previousIndex.MergedLogEntryIndex);
}
return(previousIndex.MergedLogEntryIndex + 1);
}
return(0);
}
public int FindInsertionIndexNoLock(MergedLogLineIndex index)
{
if (_indices.Count == 0)
{
return(0);
}
// Changes are we need to insert that index AFTER the last, so let's
// optimize for that...
if (index.Timestamp >= _indices[_indices.Count - 1].Timestamp)
{
return(_indices.Count);
}
var binary = FindInsertionIndexBinary(index.Timestamp);
/*var actual = FindInsertionIndexLinear(index.Timestamp);
* if (actual != binary)
* throw new NotImplementedException($"Mismatch detected: linear search wants to insert at {actual} and binary wants to insert at {binary} (the latter is incorrect)");
* return actual*/
return(binary);
}
