C# Page.EnsureHasSpaceFor方法代码示例

        private void MoveLeafNode(Page parentPage, Page from, Page to)
        {
            Debug.Assert(from.IsBranch == false);
            var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry);

            var fromNode = from.GetNode(from.LastSearchPosition);
			byte* val = @from.Base + @from.KeysOffsets[@from.LastSearchPosition] + Constants.NodeHeaderSize + originalFromKeyStart.Size;

			var nodeVersion = fromNode->Version; // every time new node is allocated the version is increased, but in this case we do not want to increase it
			if (nodeVersion > 0)
				nodeVersion -= 1;

	        var prefixedOriginalFromKey = to.PrepareKeyToInsert(originalFromKeyStart, to.LastSearchPosition);

	        byte* dataPos;
	        var fromDataSize = fromNode->DataSize;
	        switch (fromNode->Flags)
	        {
				case NodeFlags.PageRef:
					to.EnsureHasSpaceFor(_tx, prefixedOriginalFromKey, -1);
					dataPos = to.AddPageRefNode(to.LastSearchPosition, prefixedOriginalFromKey, fromNode->PageNumber);
					break;
				case NodeFlags.Data:
					to.EnsureHasSpaceFor(_tx, prefixedOriginalFromKey, fromDataSize);
					dataPos = to.AddDataNode(to.LastSearchPosition, prefixedOriginalFromKey, fromDataSize, nodeVersion);
					break;
				case NodeFlags.MultiValuePageRef:
					to.EnsureHasSpaceFor(_tx, prefixedOriginalFromKey, fromDataSize);
					dataPos = to.AddMultiValueNode(to.LastSearchPosition, prefixedOriginalFromKey, fromDataSize, nodeVersion);
					break;
				default:
			        throw new NotSupportedException("Invalid node type to move: " + fromNode->Flags);
	        }
			
			if(dataPos != null && fromDataSize > 0)
                Memory.Copy(dataPos, val, fromDataSize);
            
            from.RemoveNode(from.LastSearchPositionOrLastEntry);

            var pos = parentPage.LastSearchPositionOrLastEntry;
            parentPage.RemoveNode(pos);

            var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now
            var pageNumber = to.PageNumber;
            if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
            {
                pageNumber = from.PageNumber;
                newSeparatorKey = GetActualKey(from, 0);
            }

			AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos);
        }

        private void MoveBranchNode(Page parentPage, Page from, Page to)
        {
            Debug.Assert(from.IsBranch);

	        var originalFromKey = to.PrepareKeyToInsert(GetActualKey(from, from.LastSearchPositionOrLastEntry), to.LastSearchPosition);

            to.EnsureHasSpaceFor(_tx, originalFromKey, -1);

            var fromNode = from.GetNode(from.LastSearchPosition);
            long pageNum = fromNode->PageNumber;

            if (to.LastSearchPosition == 0)
            {
                // cannot add to left implicit side, adjust by moving the left node
                // to the right by one, then adding the new one as the left

	            NodeHeader* actualKeyNode;
                var implicitLeftKey = GetActualKey(to, 0, out actualKeyNode);
	            var implicitLeftNode = to.GetNode(0);
				var leftPageNumber = implicitLeftNode->PageNumber;

	            MemorySlice implicitLeftKeyToInsert;

	            if (implicitLeftNode == actualKeyNode)
	            {
					// no need to create a prefix, just use the existing prefixed key from the node
					// this also prevents from creating a prefix which is the full key given in 'implicitLeftKey'

		            if (_tree.KeysPrefixing)
			            implicitLeftKeyToInsert = new PrefixedSlice(actualKeyNode);
		            else
			            implicitLeftKeyToInsert = new Slice(actualKeyNode);
	            }
				else
					implicitLeftKeyToInsert = to.PrepareKeyToInsert(implicitLeftKey, 1);
	            
				to.EnsureHasSpaceFor(_tx, implicitLeftKeyToInsert, -1);
				to.AddPageRefNode(1, implicitLeftKeyToInsert, leftPageNumber);

				to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node
            }
            else
            {
				to.AddPageRefNode(to.LastSearchPosition, originalFromKey, pageNum);
            }

            if (from.LastSearchPositionOrLastEntry == 0)
            {
                var rightPageNumber = from.GetNode(1)->PageNumber;
                from.RemoveNode(0); // remove the original implicit node
                from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node
                Debug.Assert(from.NumberOfEntries >= 2);
            }
            else
            {
                from.RemoveNode(from.LastSearchPositionOrLastEntry);
            }

            var pos = parentPage.LastSearchPositionOrLastEntry;
            parentPage.RemoveNode(pos);
            var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now
            var pageNumber = to.PageNumber;
            if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
            {
                pageNumber = from.PageNumber;
                newSeparatorKey = GetActualKey(from, 0);
            }

			AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos);
        }

        private void MoveBranchNode(Page parentPage, Page from, Page to)
        {
            Debug.Assert(from.IsBranch);
            var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry);

            to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1);

            var fromNode = from.GetNode(from.LastSearchPosition);
            long pageNum = fromNode->PageNumber;

            if (to.LastSearchPosition == 0)
            {
                // cannot add to left implicit side, adjust by moving the left node
                // to the right by one, then adding the new one as the left

                var implicitLeftKey = GetActualKey(to, 0);
                var leftPageNumber = to.GetNode(0)->PageNumber;
                to.AddPageRefNode(1, implicitLeftKey, leftPageNumber);
                to.AddPageRefNode(0, Slice.BeforeAllKeys, pageNum);
                to.RemoveNode(1);
            }
            else
            {
				to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, pageNum);
            }

            if (from.LastSearchPositionOrLastEntry == 0)
            {
                // cannot just remove the left node, need to adjust those
                var rightPageNumber = from.GetNode(1)->PageNumber;
                from.RemoveNode(0); // remove the original implicit node
                from.RemoveNode(0); // remove the next node that we now turned into implicit
                from.EnsureHasSpaceFor(_tx, Slice.BeforeAllKeys, -1);
                from.AddPageRefNode(0, Slice.BeforeAllKeys, rightPageNumber);
                Debug.Assert(from.NumberOfEntries >= 2);
            }
            else
            {
                from.RemoveNode(from.LastSearchPositionOrLastEntry);
            }

            var pos = parentPage.LastSearchPositionOrLastEntry;
            parentPage.RemoveNode(pos);
            var newKey = GetActualKey(to, 0); // get the next smallest key it has now
            var pageNumber = to.PageNumber;
            if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
            {
                pageNumber = from.PageNumber;
                newKey = GetActualKey(from, 0);
            }
            parentPage.EnsureHasSpaceFor(_tx, newKey, -1);
			parentPage.AddPageRefNode(pos, newKey, pageNumber);
        }