public bool Seek(Slice key) { if (this.ValidateCurrentKey(Current, _cmp) == false) { return(false); } CurrentKey = NodeHeader.GetData(_tx, _item); return(true); }
public void MultiAdd(Transaction tx, Slice key, Slice value, ushort?version = null) { if (value == null) { throw new ArgumentNullException("value"); } if (value.Size > tx.DataPager.MaxNodeSize) { throw new ArgumentException( "Cannot add a value to child tree that is over " + tx.DataPager.MaxNodeSize + " bytes in size", "value"); } if (value.Size == 0) { throw new ArgumentException("Cannot add empty value to child tree"); } State.IsModified = true; Lazy <Cursor> lazy; var page = FindPageFor(tx, key, out lazy); if (page == null || page.LastMatch != 0) { var ptr = DirectAdd(tx, key, value.Size, version: version); value.CopyTo(ptr); return; } page = tx.ModifyPage(page.PageNumber, page); var item = page.GetNode(page.LastSearchPosition); CheckConcurrency(key, version, item->Version, TreeActionType.Add); var existingValue = new Slice(DirectRead(tx, key), (ushort)item->DataSize); if (existingValue.Compare(value, _cmp) == 0) { return; //nothing to do, the exact value is already there } if (item->Flags == NodeFlags.MultiValuePageRef) { var tree = OpenOrCreateMultiValueTree(tx, key, item); tree.DirectAdd(tx, value, 0); } else // need to turn to tree { var tree = Create(tx, _cmp, TreeFlags.MultiValue); var current = NodeHeader.GetData(tx, item); tree.DirectAdd(tx, current, 0); tree.DirectAdd(tx, value, 0); tx.AddMultiValueTree(this, key, tree); // we need to record that we switched to tree mode here, so the next call wouldn't also try to create the tree again DirectAdd(tx, key, sizeof(TreeRootHeader), NodeFlags.MultiValuePageRef); } }
public void MultiAdd(Transaction tx, Slice key, Slice value) { if (value == null) { throw new ArgumentNullException("value"); } if (value.Size > tx.Pager.MaxNodeSize) { throw new ArgumentException("Cannot add a value to child tree that is over " + tx.Pager.MaxNodeSize + " bytes in size", "value"); } if (value.Size == 0) { throw new ArgumentException("Cannot add empty value to child tree"); } using (var cursor = tx.NewCursor(this)) { var page = FindPageFor(tx, key, cursor); if (page == null || page.LastMatch != 0) { var ptr = DirectAdd(tx, key, value.Size); value.CopyTo(ptr); return; } var txInfo = tx.GetTreeInformation(this); page = tx.ModifyCursor(txInfo, cursor); var item = page.GetNode(page.LastSearchPosition); if (item->Flags == NodeFlags.MultiValuePageRef) { var tree = OpenOrCreateMultiValueTree(tx, key, item); tree.DirectAdd(tx, value, 0); } else // need to turn to tree { var tree = Create(tx, _cmp, TreeFlags.MultiValue); var current = NodeHeader.GetData(tx, item); tree.DirectAdd(tx, current, 0); tree.DirectAdd(tx, value, 0); tx.AddMultiValueTree(this, key, tree); DirectAdd(tx, key, sizeof(TreeRootHeader)); cursor.Clear(); page = FindPageFor(tx, key, cursor); Debug.Assert(page.LastMatch == 0); page.GetNode(page.LastSearchPosition)->Flags = NodeFlags.MultiValuePageRef; } } }