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 byte* AddNodeToPage(Page page, int index)
{
switch (_nodeType)
{
case NodeFlags.PageRef:
return page.AddPageRefNode(index, _newKey, _pageNumber);
case NodeFlags.Data:
return page.AddDataNode(index, _newKey, _len, _nodeVersion);
case NodeFlags.MultiValuePageRef:
return page.AddMultiValueNode(index, _newKey, _len, _nodeVersion);
default:
throw new NotSupportedException("Unknown node type");
}
}
private byte* AddNodeToPage(Page page, int index, MemorySlice alreadyPreparedNewKey = null)
{
var newKeyToInsert = alreadyPreparedNewKey ?? page.PrepareKeyToInsert(_newKey, index);
switch (_nodeType)
{
case NodeFlags.PageRef:
return page.AddPageRefNode(index, newKeyToInsert, _pageNumber);
case NodeFlags.Data:
return page.AddDataNode(index, newKeyToInsert, _len, _nodeVersion);
case NodeFlags.MultiValuePageRef:
return page.AddMultiValueNode(index, newKeyToInsert, _len, _nodeVersion);
default:
throw new NotSupportedException("Unknown node type");
}
}
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(to, parentPage, pageNumber, newSeparatorKey, pos);
}