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 void Reset(long pageNumber)
{
for (int i = 0; i < _cache.Length; i++)
{
if (_cache[i].IsValid && _cache[i].PageNumber == pageNumber)
{
_cache[i] = new PageHandlePtr();
return;
}
}
}