public Page GetWritablePage(long pageNumber)
{
int position = current;
int itemsLeft = _cache.Length;
while (itemsLeft > 0)
{
int i = position % _cache.Length;
// If the value is not valid or the page number is not equal
if (!_cache[i].IsValid || _cache[i].PageNumber != pageNumber)
{
// we continue.
itemsLeft--;
position++;
continue;
}
if (!_cache[i].IsWritable)
{
_cache[i] = new PageHandlePtr(_tx.ModifyPage(pageNumber), true);
}
return(_cache[i].Value);
}
current = (++current) % _cache.Length;
_cache[current] = new PageHandlePtr(_tx.ModifyPage(pageNumber), true);
return(_cache[current].Value);
}
public TreePage ModifyPage(long pageNumber)
{
var newPage = _llt.ModifyPage(pageNumber).ToTreePage();
newPage.Dirty = true;
_recentlyFoundPages.Reset(pageNumber);
PageModified?.Invoke(pageNumber);
return(newPage);
}
public Page GetWritablePage(long pageNumber)
{
var position = pageNumber & _andMask;
PageData *node = &_cache[position];
if (node->IsWritable && node->PageNumber == pageNumber)
{
return(node->Page);
}
var page = _tx.ModifyPage(pageNumber);
node->PageNumber = pageNumber;
node->Page = page;
node->IsWritable = true;
return(page);
}
protected void EnsureHeaderModified()
{
var page = _tx.ModifyPage(_sectionHeader->PageNumber);
_sectionHeader = (RawDataSmallSectionPageHeader *)page.Pointer;
}
internal TreePage GetWriteableTreePage(long pageNumber)
{
var page = _llt.ModifyPage(pageNumber);
return(new TreePage(page.Pointer, Constants.Storage.PageSize));
}