/// <summary>
/// Allocates new db item with specified content and produces reference to it.
/// </summary>
/// <param name="content">Content of item to allocate</param>
/// <returns>Reference to the allocated item</returns>
public DbItemReference Allocate(byte[] content)
{
var item = new DbItem(content);
return(item.GetAllocationType(_pageManager.PageSize) == AllocationType.SinglePage
? AllocateSinglePage(item)
: AllocateMultiPage(item));
}
/// <summary>
/// Reallocates already allocated db item with specified content and produces reference to it.
/// </summary>
/// <param name="reference">Reference to already allocated item</param>
/// <param name="newContent">Content of item to reallocate</param>
/// <returns>Reference to the reallocated item</returns>
public DbItemReference Reallocate(DbItemReference reference, byte[] newContent)
{
var item = new DbItem(newContent);
if (item.GetAllocationType(_pageManager.PageSize) == AllocationType.SinglePage)
{
IPage page = _pageManager.FetchPage(reference.PageIndex);
if (PageFormatter.GetPageHeader(page).SizeRange == item.SizeRange)
{
PageFormatter.RewriteFixedSizeItem(page, reference.ItemIndex, item);
_pageManager.UpdatePage(page);
return(reference);
}
Free(reference);
return(AllocateSinglePage(item));
}
Free(reference);
return(AllocateMultiPage(item));
}
