private async Task <List <TEntry> > ReadWithUnknownEnd(TKey id, TableQuery <TsdbTableEntity> query, ITable currentTable, Sort sort, int?count)
{
List <List <TEntry> > entries = new List <List <TEntry> >();
var maxTableMisses = _tableProvider.GetMaxTableMisses(id);
int tableMisses = 0;
bool queryMoreTables = true;
while (queryMoreTables)
{
var foundEntries = await ReadInternal(query, currentTable, sort, count).ConfigureAwait(false);
entries.Add(foundEntries);
// if we have not found everything
if (!count.HasValue || entries.Sum(x => x.Count) < count)
{
// determine if we should try more
if (foundEntries.Count > 0)
{
tableMisses = 0;
// we want to keep trying as we found something in this table (likely there MAY be more in previous table)
currentTable = _tableProvider.GetPreviousTable(currentTable);
}
else
{
// we did NOT find anything in this table
if (tableMisses <= maxTableMisses)
{
// ONLY look in previous table if this was our FIRST iteration
currentTable = _tableProvider.GetPreviousTable(currentTable);
tableMisses++;
}
else
{
queryMoreTables = false;
}
}
}
else
{
// if we have found everything
queryMoreTables = false;
}
}
if (sort == Sort.Ascending)
{
entries.Reverse();
}
return(entries.SelectMany(x => x).ToList());
}
