private void AddSeparatorToParentPage(long pageNumber, MemorySlice seperatorKey)
{
var separatorKeyToInsert = _parentPage.PrepareKeyToInsert(seperatorKey, _parentPage.LastSearchPosition);
if (_parentPage.HasSpaceFor(_tx, SizeOf.BranchEntry(separatorKeyToInsert) + Constants.NodeOffsetSize + SizeOf.NewPrefix(separatorKeyToInsert)) == false)
{
var pageSplitter = new PageSplitter(_tx, _tree, seperatorKey, -1, pageNumber, NodeFlags.PageRef,
0, _cursor, _treeState);
pageSplitter.Execute();
}
else
{
_parentPage.NodePositionFor(seperatorKey); // select the appropriate place for this
_parentPage.AddPageRefNode(_parentPage.LastSearchPosition, separatorKeyToInsert, pageNumber);
}
}
private bool HasEnoughSpaceToCopyNodes(Page left, Page right)
{
var actualSpaceNeeded = 0;
var previousSearchPosition = right.LastSearchPosition;
for (int i = 0; i < right.NumberOfEntries; i++)
{
right.LastSearchPosition = i;
var key = GetActualKey(right, right.LastSearchPositionOrLastEntry);
var node = right.GetNode(i);
actualSpaceNeeded += (SizeOf.NodeEntryWithAnotherKey(node, key) + Constants.NodeOffsetSize);
}
right.LastSearchPosition = previousSearchPosition; //previous position --> prevent mutation of parameter
return(left.HasSpaceFor(_tx, actualSpaceNeeded));
}
private byte *InsertNewKey(Page p)
{
int pos = p.NodePositionFor(_newKey);
var newKeyToInsert = p.PrepareKeyToInsert(_newKey, pos);
if (p.HasSpaceFor(_tx, p.GetRequiredSpace(newKeyToInsert, _len)) == false)
{
_cursor.Push(p);
var pageSplitter = new PageSplitter(_tx, _tree, _newKey, _len, _pageNumber, _nodeType, _nodeVersion, _cursor, _treeState);
return(pageSplitter.Execute());
}
byte *dataPos = AddNodeToPage(p, pos, newKeyToInsert);
_cursor.Push(p);
return(dataPos);
}
public void MultiAdd(Slice key, Slice value, ushort? version = null)
{
if (value == null) throw new ArgumentNullException("value");
int maxNodeSize = _tx.DataPager.MaxNodeSize;
if (value.Size > maxNodeSize)
throw new ArgumentException(
"Cannot add a value to child tree that is over " + 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(key, out lazy);
if ((page == null || page.LastMatch != 0))
{
MultiAddOnNewValue(_tx, key, value, version, maxNodeSize);
return;
}
page = _tx.ModifyPage(page.PageNumber, page);
var item = page.GetNode(page.LastSearchPosition);
// already was turned into a multi tree, not much to do here
if (item->Flags == NodeFlags.MultiValuePageRef)
{
var existingTree = OpenOrCreateMultiValueTree(_tx, key, item);
existingTree.DirectAdd(value, 0, version: version);
return;
}
byte* nestedPagePtr;
if (item->Flags == NodeFlags.PageRef)
{
var overFlowPage = _tx.ModifyPage(item->PageNumber, null);
nestedPagePtr = overFlowPage.Base + Constants.PageHeaderSize;
}
else
{
nestedPagePtr = NodeHeader.DirectAccess(_tx, item);
}
var nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item));
var existingItem = nestedPage.Search(value);
if (nestedPage.LastMatch != 0)
existingItem = null;// not an actual match, just greater than
ushort previousNodeRevision = existingItem != null ? existingItem->Version : (ushort)0;
CheckConcurrency(key, value, version, previousNodeRevision, TreeActionType.Add);
if (existingItem != null)
{
// maybe same value added twice?
var tmpKey = new Slice(item);
if (tmpKey.Compare(value) == 0)
return; // already there, turning into a no-op
nestedPage.RemoveNode(nestedPage.LastSearchPosition);
}
if (nestedPage.HasSpaceFor(_tx, value, 0))
{
// we are now working on top of the modified root page, we can just modify the memory directly
nestedPage.AddDataNode(nestedPage.LastSearchPosition, value, 0, previousNodeRevision);
return;
}
int pageSize = nestedPage.CalcSizeUsed() + Constants.PageHeaderSize;
var newRequiredSize = pageSize + nestedPage.GetRequiredSpace(value, 0);
if (newRequiredSize <= maxNodeSize)
{
// we can just expand the current value... no need to create a nested tree yet
var actualPageSize = (ushort)Math.Min(Utils.NearestPowerOfTwo(newRequiredSize), maxNodeSize);
ExpandMultiTreeNestedPageSize(_tx, key, value, nestedPagePtr, actualPageSize, item->DataSize);
return;
}
// we now have to convert this into a tree instance, instead of just a nested page
var tree = Create(_tx, TreeFlags.MultiValue);
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var existingValue = nestedPage.GetNodeKey(i);
tree.DirectAdd(existingValue, 0);
}
tree.DirectAdd(value, 0, version: version);
_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(key, sizeof (TreeRootHeader), NodeFlags.MultiValuePageRef);
}
private void AddSeparatorToParentPage(Page parentPage, long pageNumber, MemorySlice seperatorKey, int separatorKeyPosition)
{
var separatorKeyToInsert = parentPage.PrepareKeyToInsert(seperatorKey, separatorKeyPosition);
if (parentPage.HasSpaceFor(_tx, SizeOf.BranchEntry(separatorKeyToInsert) + Constants.NodeOffsetSize + SizeOf.NewPrefix(separatorKeyToInsert)) == false)
{
var pageSplitter = new PageSplitter(_tx, _tree, seperatorKey, -1, pageNumber, NodeFlags.PageRef,
0, _cursor, _tree.State);
pageSplitter.Execute();
}
else
{
parentPage.AddPageRefNode(separatorKeyPosition, separatorKeyToInsert, pageNumber);
}
}
public void MultiAdd(Slice key, Slice value, ushort?version = null)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
int maxNodeSize = AbstractPager.NodeMaxSize;
if (value.Size > maxNodeSize)
{
throw new ArgumentException(
"Cannot add a value to child tree that is over " + 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;
NodeHeader * node;
var page = FindPageFor(key, out node, out lazy);
if ((page == null || page.LastMatch != 0))
{
MultiAddOnNewValue(_tx, key, value, version, maxNodeSize);
return;
}
page = _tx.ModifyPage(page.PageNumber, page);
var item = page.GetNode(page.LastSearchPosition);
// already was turned into a multi tree, not much to do here
if (item->Flags == NodeFlags.MultiValuePageRef)
{
var existingTree = OpenMultiValueTree(_tx, key, item);
existingTree.DirectAdd(value, 0, version: version);
return;
}
byte *nestedPagePtr;
if (item->Flags == NodeFlags.PageRef)
{
var overFlowPage = _tx.ModifyPage(item->PageNumber, null);
nestedPagePtr = overFlowPage.Base + Constants.PageHeaderSize;
}
else
{
nestedPagePtr = NodeHeader.DirectAccess(_tx, item);
}
var nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item));
var existingItem = nestedPage.Search(value);
if (nestedPage.LastMatch != 0)
{
existingItem = null; // not an actual match, just greater than
}
ushort previousNodeRevision = existingItem != null ? existingItem->Version : (ushort)0;
CheckConcurrency(key, value, version, previousNodeRevision, TreeActionType.Add);
if (existingItem != null)
{
// maybe same value added twice?
var tmpKey = page.GetNodeKey(item);
if (tmpKey.Compare(value) == 0)
{
return; // already there, turning into a no-op
}
nestedPage.RemoveNode(nestedPage.LastSearchPosition);
}
var valueToInsert = nestedPage.PrepareKeyToInsert(value, nestedPage.LastSearchPosition);
if (nestedPage.HasSpaceFor(_tx, valueToInsert, 0))
{
// we are now working on top of the modified root page, we can just modify the memory directly
nestedPage.AddDataNode(nestedPage.LastSearchPosition, valueToInsert, 0, previousNodeRevision);
return;
}
int pageSize = nestedPage.CalcSizeUsed() + Constants.PageHeaderSize;
var newRequiredSize = pageSize + nestedPage.GetRequiredSpace(valueToInsert, 0);
if (newRequiredSize <= maxNodeSize)
{
// we can just expand the current value... no need to create a nested tree yet
var actualPageSize = (ushort)Math.Min(Utils.NearestPowerOfTwo(newRequiredSize), maxNodeSize);
var currentDataSize = NodeHeader.GetDataSize(_tx, item);
ExpandMultiTreeNestedPageSize(_tx, key, value, nestedPagePtr, actualPageSize, currentDataSize);
return;
}
// we now have to convert this into a tree instance, instead of just a nested page
var tree = Create(_tx, KeysPrefixing, TreeFlags.MultiValue);
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var existingValue = nestedPage.GetNodeKey(i);
tree.DirectAdd(existingValue, 0);
}
tree.DirectAdd(value, 0, version: version);
_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(key, sizeof(TreeRootHeader), NodeFlags.MultiValuePageRef);
}
private byte* InsertNewKey(Page p)
{
int pos = p.NodePositionFor(_newKey);
var newKeyToInsert = p.PrepareKeyToInsert(_newKey, pos);
if (p.HasSpaceFor(_tx, p.GetRequiredSpace(newKeyToInsert, _len)) == false)
{
_cursor.Push(p);
var pageSplitter = new PageSplitter(_tx, _tree, _newKey, _len, _pageNumber, _nodeType, _nodeVersion, _cursor, _treeState);
return pageSplitter.Execute();
}
byte* dataPos = AddNodeToPage(p, pos, newKeyToInsert);
_cursor.Push(p);
return dataPos;
}
private bool HasEnoughSpaceToCopyNodes(Page left, Page right)
{
var actualSpaceNeeded = 0;
var previousSearchPosition = right.LastSearchPosition;
for (int i = 0; i < right.NumberOfEntries; i++)
{
right.LastSearchPosition = i;
var key = GetActualKey(right, right.LastSearchPositionOrLastEntry);
var node = right.GetNode(i);
actualSpaceNeeded += (SizeOf.NodeEntryWithAnotherKey(node, key) + Constants.NodeOffsetSize);
}
right.LastSearchPosition = previousSearchPosition; //previous position --> prevent mutation of parameter
return left.HasSpaceFor(_tx, actualSpaceNeeded);
}
public byte *AddSeparator(MemorySlice separator, long pageRefNumber, int?nodePos = null)
{
var originalLastSearchPositionOfParent = _parentPage.LastSearchPosition;
if (nodePos == null)
{
nodePos = _parentPage.NodePositionFor(separator); // select the appropriate place for this
}
var separatorKeyToInsert = _parentPage.PrepareKeyToInsert(separator, nodePos.Value);
if (_parentPage.HasSpaceFor(_tx, SizeOf.BranchEntry(separatorKeyToInsert) + Constants.NodeOffsetSize + SizeOf.NewPrefix(separatorKeyToInsert)) == false)
{
var pageSplitter = new PageSplitter(_tx, _tree, separator, -1, pageRefNumber, NodeFlags.PageRef, 0, _cursor, _tree.State);
var posToInsert = pageSplitter.Execute();
ParentOfAddedPageRef = _cursor.CurrentPage;
var adjustParentPageOnCursor = true;
for (int i = 0; i < _cursor.CurrentPage.NumberOfEntries; i++)
{
if (_cursor.CurrentPage.GetNode(i)->PageNumber == _currentPage.PageNumber)
{
adjustParentPageOnCursor = false;
_cursor.CurrentPage.LastSearchPosition = i;
break;
}
}
if (adjustParentPageOnCursor)
{
// the above page split has modified the cursor that its first page points to the parent of the leaf where 'separatorKey' was inserted
// and it doesn't have the reference to _page, we need to ensure that the actual parent is first at the cursor
_cursor.Pop();
_cursor.Push(_parentPage);
EnsureValidLastSearchPosition(_parentPage, _currentPage.PageNumber, originalLastSearchPositionOfParent);
}
#if VALIDATE
Debug.Assert(_cursor.CurrentPage.GetNode(_cursor.CurrentPage.LastSearchPosition)->PageNumber == _currentPage.PageNumber,
"The parent page is not referencing a page which is being split");
var parentToValidate = ParentOfAddedPageRef;
Debug.Assert(Enumerable.Range(0, parentToValidate.NumberOfEntries).Any(i => parentToValidate.GetNode(i)->PageNumber == pageRefNumber),
"The parent page of a page reference isn't referencing it");
#endif
return(posToInsert);
}
ParentOfAddedPageRef = _parentPage;
var pos = _parentPage.AddPageRefNode(nodePos.Value, separatorKeyToInsert, pageRefNumber);
EnsureValidLastSearchPosition(_parentPage, _currentPage.PageNumber, originalLastSearchPositionOfParent);
return(pos);
}
