/// <summary>
/// If any file timestamp is in the future
/// (beyond now + FUTURE_TIMESTAMP_THRESHOLD_MS), we will set its
/// effective timestamp to 0 (the beginning of unix time), thus
/// sending it to the head of the queue for eviction (entries with
/// the lowest timestamps are evicted first). This is a safety check
/// in case we get files that are written with a future timestamp.
/// We are adding a small delta (this constant) to account for
/// network time changes, timezone changes, etc.
/// </summary>
private ICollection <IEntry> GetSortedEntries(ICollection <IEntry> allEntries)
{
DateTime threshold = _clock.Now.AddMilliseconds(FUTURE_TIMESTAMP_THRESHOLD_MS);
List <IEntry> sortedList = new List <IEntry>(allEntries.Count);
List <IEntry> listToSort = new List <IEntry>(allEntries.Count);
foreach (var entry in allEntries)
{
if (entry.Timestamp > threshold)
{
sortedList.Add(entry);
}
else
{
listToSort.Add(entry);
}
}
listToSort.Sort(_entryEvictionComparatorSupplier.Get());
sortedList.AddRange(listToSort);
return(sortedList);
}
