private byte *AddNodeToPage(TreePage page, int index, Slice alreadyPreparedNewKey = default(Slice))
{
var newKeyToInsert = alreadyPreparedNewKey.HasValue ? alreadyPreparedNewKey : _newKey;
switch (_nodeType)
{
case TreeNodeFlags.PageRef:
return(page.AddPageRefNode(index, newKeyToInsert, _pageNumber));
case TreeNodeFlags.Data:
return(page.AddDataNode(index, newKeyToInsert, _len));
case TreeNodeFlags.MultiValuePageRef:
return(page.AddMultiValueNode(index, newKeyToInsert, _len));
default:
throw new NotSupportedException("Unknown node type");
}
}
private void MoveLeafNode(TreePage parentPage, TreePage from, TreePage to)
{
Debug.Assert(from.IsBranch == false);
Slice originalFromKeyStart;
using (GetActualKey(from, from.LastSearchPositionOrLastEntry, out originalFromKeyStart))
{
var fromNode = from.GetNode(from.LastSearchPosition);
byte *val = @from.Base + @from.KeysOffsets[@from.LastSearchPosition] + Constants.Tree.NodeHeaderSize +
originalFromKeyStart.Size;
byte *dataPos;
var fromDataSize = fromNode->DataSize;
switch (fromNode->Flags)
{
case TreeNodeFlags.PageRef:
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1);
dataPos = to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, fromNode->PageNumber);
break;
case TreeNodeFlags.Data:
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, fromDataSize);
dataPos = to.AddDataNode(to.LastSearchPosition, originalFromKeyStart, fromDataSize);
break;
case TreeNodeFlags.MultiValuePageRef:
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, fromDataSize);
dataPos = to.AddMultiValueNode(to.LastSearchPosition, originalFromKeyStart, fromDataSize);
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);
Slice newSeparatorKey;
var scope = GetActualKey(to, 0, out newSeparatorKey); // get the next smallest key it has now
try
{
var pageNumber = to.PageNumber;
if (parentPage.GetNode(0)->PageNumber == to.PageNumber)
{
pageNumber = from.PageNumber;
scope.Dispose();
scope = GetActualKey(from, 0, out newSeparatorKey);
}
AddSeparatorToParentPage(to, parentPage, pageNumber, newSeparatorKey, pos);
}
finally
{
scope.Dispose();
}
}
}
private void MoveLeafNode(TreePage parentPage, TreePage from, TreePage 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;
}
byte *dataPos;
var fromDataSize = fromNode->DataSize;
switch (fromNode->Flags)
{
case TreeNodeFlags.PageRef:
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1);
dataPos = to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, fromNode->PageNumber);
break;
case TreeNodeFlags.Data:
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, fromDataSize);
dataPos = to.AddDataNode(to.LastSearchPosition, originalFromKeyStart, fromDataSize, nodeVersion);
break;
case TreeNodeFlags.MultiValuePageRef:
to.EnsureHasSpaceFor(_tx, originalFromKeyStart, fromDataSize);
dataPos = to.AddMultiValueNode(to.LastSearchPosition, originalFromKeyStart, 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);
}
