public MyPage GetWritablePage(long pageNumber)
{
int position = _current;
int itemsLeft = _cache.Length;
while (itemsLeft > 0)
{
int i = position % _cache.Length;
// If the page number is equal to the page number we are looking for (therefore it's valid)
// Will not fail at PageNumber=0 because the accesor will handle that.
if (_cache[i].PageNumber != pageNumber)
{
// we continue.
itemsLeft--;
position++;
continue;
}
if (!_cache[i].IsWritable)
{
_cache[i] = new PageHandlePtr(LowLevelTransaction.ModifyPage(pageNumber), true);
}
return(_cache[i].Value);
}
_current = (_current + 1) % _cache.Length;
_cache[_current] = new PageHandlePtr(LowLevelTransaction.ModifyPage(pageNumber), true);
return(_cache[_current].Value);
}
public void Reset(long pageNumber)
{
for (int i = 0; i < _cache.Length; i++)
{
if (_cache[i].PageNumber == pageNumber)
{
_cache[i] = new PageHandlePtr();
return;
}
}
}