| private AddMultiValueTree ( Voron.Trees.Tree tree, MemorySlice key, Voron.Trees.Tree mvTree ) : void | ||
| tree | Voron.Trees.Tree | |
| key | MemorySlice | |
| mvTree | Voron.Trees.Tree | |
| return | void | |
private Tree OpenOrCreateMultiValueTree(Transaction tx, Slice key, NodeHeader* item)
{
Tree tree;
if (tx.TryGetMultiValueTree(this, key, out tree))
return tree;
var childTreeHeader =
(TreeRootHeader*)((byte*)item + item->KeySize + Constants.NodeHeaderSize);
Debug.Assert(childTreeHeader->RootPageNumber < tx.State.NextPageNumber);
tree = childTreeHeader != null ?
Open(tx, childTreeHeader) :
Create(tx);
tx.AddMultiValueTree(this, key, tree);
return tree;
}
public void MultiAdd(Transaction tx, 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(tx, 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(tx, value, 0, version: version);
return;
}
var nestedPagePtr = NodeHeader.DirectAccess(tx, item);
var nestedPage = new Page(nestedPagePtr, "multi tree", (ushort) NodeHeader.GetDataSize(tx, item));
var existingItem = nestedPage.Search(value, NativeMethods.memcmp);
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, _cmp) == 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, _cmp, TreeFlags.MultiValue);
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var existingValue = nestedPage.GetNodeKey(i);
tree.DirectAdd(tx, existingValue, 0);
}
tree.DirectAdd(tx, 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(tx, key, sizeof (TreeRootHeader), NodeFlags.MultiValuePageRef);
}
private void MultiAddOnNewValue(Transaction tx, Slice key, Slice value, ushort? version, int maxNodeSize)
{
var requiredPageSize = Constants.PageHeaderSize + SizeOf.LeafEntry(-1, value, 0) + Constants.NodeOffsetSize;
if (requiredPageSize > maxNodeSize)
{
// no choice, very big value, we might as well just put it in its own tree from the get go...
// otherwise, we would have to put this in overflow page, and that won't save us any space anyway
var tree = Create(tx, TreeFlags.MultiValue);
tree.DirectAdd(value, 0);
tx.AddMultiValueTree(this, key, tree);
DirectAdd(key, sizeof (TreeRootHeader), NodeFlags.MultiValuePageRef);
return;
}
var actualPageSize = (ushort) Math.Min(Utils.NearestPowerOfTwo(requiredPageSize), maxNodeSize);
var ptr = DirectAdd(key, actualPageSize);
var nestedPage = new Page(ptr, "multi tree", actualPageSize)
{
PageNumber = -1L,// hint that this is an inner page
Lower = (ushort) Constants.PageHeaderSize,
Upper = actualPageSize,
Flags = PageFlags.Leaf,
};
CheckConcurrency(key, value, version, 0, TreeActionType.Add);
nestedPage.AddDataNode(0, value, 0, 0);
}
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);
}
}
