/// <summary>
/// Processes the GetBlock from the committed area.
/// </summary>
/// <param name="pageLock"></param>
/// <param name="position"></param>
/// <param name="pointer">an output parameter that contains the pointer for the provided position</param>
/// <remarks>The valid length is at least the size of the buffer pools page size.</remarks>
private void GetBlockFromCommittedSpace(PageReplacementAlgorithm.PageLock pageLock, long position, out IntPtr pointer)
{
//If the page is in the buffer, we can return and don't have to read it.
if (pageLock.TryGetSubPage(position, out pointer))
return;
//If the address doesn't exist in the current list. Read it from the disk.
int poolPageIndex;
IntPtr poolAddress;
m_pool.AllocatePage(out poolPageIndex, out poolAddress);
m_queue.Read(position, poolAddress);
//Since a race condition exists, I need to check the buffer to make sure that
//the most recently read page already exists in the PageReplacementAlgorithm.
bool wasPageAdded;
pointer = pageLock.GetOrAddPage(position, poolAddress, poolPageIndex, out wasPageAdded);
//If I lost on the race condition, I need to re-release this page.
if (!wasPageAdded)
m_pool.ReleasePage(poolPageIndex);
}
