public unsafe IDriverNode Find(string path)
{
// 1) Locate children TS first.
ulong childrenTS;
Block block = journal.ReadService.Read(BlockType.NodeHeaderBlock, commonAddress);
fixed(byte *p = block.Data)
{
NodeCommonHeader *header = (NodeCommonHeader *)p;
childrenTS = header->ChildrenBTree;
}
// 2) Search in B+ tree.
BPlusTree tree = new BPlusTree(childrenTS);
ObjectInfo info = tree.Find(journal.ReadService, (uint)path.GetHashCode());
if (info == null)
{
return(null);
}
// 3) Find the actual object address.
BlockStream stream = BlockStream.FromBase(info.Address, journal.ReadService);
ChildTag childTag = Common.DeserializeFromArray(stream.Read(info.Size)) as ChildTag;
ulong? address = childTag.Find(path);
if (!address.HasValue)
{
return(null); // May only match hash value.
}
// Return the physical node (most current version).
return(new PhysicalNode(path, address.Value, journal));
}
public unsafe void DeleteChild(string name)
{
// 1) Find children TS.
ulong childTS = 0;
Block block = journal.ReadService.Read(BlockType.NodeHeaderBlock, commonAddress);
fixed(byte *p = block.Data)
{
NodeCommonHeader *header = (NodeCommonHeader *)p;
childTS = header->ChildrenBTree;
}
// 2) Find child.
BPlusTree tree = new BPlusTree(childTS);
ObjectInfo info = tree.Find(journal.ReadService, (uint)name.GetHashCode());
BlockStream stream = BlockStream.FromBase(info.Address, journal.ReadService);
ChildTag tag = Common.DeserializeFromArray(stream.Read(info.Size)) as ChildTag;
ulong? childAddress = tag.Find(name);
// Execute operation
Operations.DeleteChild deleteChild = new DeleteChild(childAddress.Value, childTS, name);
journal.Execute(deleteChild);
}
