/// <summary>
/// </summary>
/// <param name="tx"></param>
/// <param name="page"></param>
/// <returns></returns>
public static OverflowPage ModifyPage(this ILowLevelTransaction tx, OverflowPage page)
{
var newPage = tx.ModifyPage(page.StoreId, page.PageNumber);
if (newPage == null)
{
throw new InvalidOperationException($"modify page failed,pagerid:{page.StoreId},pagenumber:{page.PageNumber}");
}
return(newPage.AsOverflow());
}
public void OnChanged(OverflowPage page, TreePageChangeFlags flags)
{
switch (flags)
{
case TreePageChangeFlags.New:
Header.PageCount++;
Header.OverflowCount++;
break;
case TreePageChangeFlags.Free:
Header.PageCount--;
Header.OverflowCount--;
break;
}
}
public static OverflowPage[] AllocateOverflows(this ILowLevelTransaction tx, int pagerId, uint count)
{
var pages = tx.AllocatePage(pagerId, count);
var overflows = new OverflowPage[count];
for (var i = 0; i < overflows.Length; i++)
{
if (i == 0)
{
overflows[i] = pages[i].AsOverflow();
continue;
}
overflows[i] = pages[i].AsOverflow();
overflows[i - 1].Header.NextPageNumber = overflows[i].PageNumber;
}
return(overflows);
}
