public void SetItems(LowLevelTransaction tx, Dictionary <long, PagePosition> items)
{
lock (_transactionPages)
{
UpdateMaxSeenTxId(tx);
_transactionPages.Add(tx.Id, items);
}
// here we rely on the fact that only one thread can update the concurrent dictionary
foreach (var item in items)
{
if (_values.TryGetValue(item.Key, out var value) == false)
{
value = new PagesBuffer(new PagePosition[2], null);
_values.TryAdd(item.Key, value);
}
if (value.CanAdd == false)
{
var newVal = new PagesBuffer(new PagePosition[value.Capacity * 2], value);
_values.TryUpdate(item.Key, newVal, value);
value = newVal;
}
value.Add(item.Value);
}
}
public PagesBuffer(PagePosition[] buffer, PagesBuffer previous)
{
PagePositions = buffer;
if (previous == null)
{
return;
}
End = previous.End - previous.Start;
Array.Copy(previous.PagePositions, previous.Start, PagePositions, 0, End);
}