private void ExpandMultiTreeNestedPageSize(Transaction tx, Slice key, Slice value, byte *nestedPagePtr, ushort newSize, int currentSize)
{
Debug.Assert(newSize > currentSize);
TemporaryPage tmp;
using (tx.Environment.GetTemporaryPage(tx, out tmp))
{
var tempPagePointer = tmp.TempPagePointer;
NativeMethods.memcpy(tempPagePointer, nestedPagePtr, currentSize);
Delete(key); // release our current page
Page nestedPage = new Page(tempPagePointer, "multi tree", (ushort)currentSize);
var ptr = DirectAdd(key, newSize);
var newNestedPage = new Page(ptr, "multi tree", newSize)
{
Lower = (ushort)Constants.PageHeaderSize,
Upper = newSize,
Flags = PageFlags.Leaf,
PageNumber = -1L // mark as invalid page number
};
Slice nodeKey = new Slice(SliceOptions.Key);
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var nodeHeader = nestedPage.GetNode(i);
nodeKey.Set(nodeHeader);
newNestedPage.AddDataNode(i, nodeKey, 0,
(ushort)(nodeHeader->Version - 1)); // we dec by one because AdddataNode will inc by one, and we don't want to change those values
}
newNestedPage.Search(value);
newNestedPage.AddDataNode(newNestedPage.LastSearchPosition, value, 0, 0);
}
}
public bool Seek(Slice key)
{
var current = _page.Search(key);
if (current == null)
{
return(false);
}
_currentKey.Set(current);
return(this.ValidateCurrentKey(current));
}
public bool Seek(Slice key)
{
_currentPage = _tree.FindPageFor(_tx, key, _cursor);
_cursor.Pop();
var node = _currentPage.Search(key, _cmp);
if (node == null)
{
return(false);
}
_currentKey.Set(node);
return(this.ValidateCurrentKey(Current, _cmp));
}
public bool Seek(Slice key)
{
var current = _page.Search(key);
if (current == null)
{
return(false);
}
_page.SetNodeKey(current, ref _currentInternalKey);
_currentKey = _currentInternalKey.ToSlice();
return(this.ValidateCurrentKey(current, _page));
}
public bool Seek(Slice key)
{
Lazy<Cursor> lazy;
_currentPage = _tree.FindPageFor(_tx, key, out lazy);
_cursor = lazy.Value;
_cursor.Pop();
var node = _currentPage.Search(key, _cmp);
if (node == null)
{
return false;
}
_currentKey.Set(node);
return this.ValidateCurrentKey(Current, _cmp);
}
public bool Seek(Slice key)
{
if (_disposed)
{
throw new ObjectDisposedException("PageIterator");
}
var current = _page.Search(key);
if (current == null)
{
return(false);
}
_page.SetNodeKey(current, ref _currentInternalKey);
_currentKey = _currentInternalKey.ToSlice();
return(this.ValidateCurrentKey(current, _page));
}
public bool Seek(Slice key)
{
Lazy<Cursor> lazy;
_currentPage = _tree.FindPageFor(key, out lazy);
_cursor = lazy.Value;
_cursor.Pop();
var node = _currentPage.Search(key);
if (node != null)
{
_currentKey.Set(node);
return this.ValidateCurrentKey(Current);
}
// The key is not found in the db, but we are Seek()ing for equals or starts with.
// We know that the exact value isn't there, but it is possible that the next page has values
// that is actually greater than the key, so we need to check it as well.
_currentPage.LastSearchPosition = _currentPage.NumberOfEntries; // force next MoveNext to move to the next _page_.
return MoveNext();
}
public bool Seek(Slice key)
{
Lazy <Cursor> lazy;
_currentPage = _tree.FindPageFor(key, out lazy);
_cursor = lazy.Value;
_cursor.Pop();
var node = _currentPage.Search(key);
if (node != null)
{
_currentKey.Set(node);
return(this.ValidateCurrentKey(Current));
}
// The key is not found in the db, but we are Seek()ing for equals or starts with.
// We know that the exact value isn't there, but it is possible that the next page has values
// that is actually greater than the key, so we need to check it as well.
_currentPage.LastSearchPosition = _currentPage.NumberOfEntries; // force next MoveNext to move to the next _page_.
return(MoveNext());
}
private void ExpandMultiTreeNestedPageSize(Transaction tx, Slice key, Slice value, byte *nestedPagePtr, ushort newSize, int currentSize)
{
Debug.Assert(newSize > currentSize);
TemporaryPage tmp;
using (tx.Environment.GetTemporaryPage(tx, out tmp))
{
var tempPagePointer = tmp.TempPagePointer;
MemoryUtils.Copy(tempPagePointer, nestedPagePtr, currentSize);
Delete(key); // release our current page
Page nestedPage = new Page(tempPagePointer, "multi tree", (ushort)currentSize);
var ptr = DirectAdd(key, newSize);
var newNestedPage = new Page(ptr, "multi tree", newSize)
{
Lower = (ushort)Constants.PageHeaderSize,
Upper = KeysPrefixing ? (ushort)(newSize - Constants.PrefixInfoSectionSize) : newSize,
Flags = KeysPrefixing ? PageFlags.Leaf | PageFlags.KeysPrefixed : PageFlags.Leaf,
PageNumber = -1L // mark as invalid page number
};
newNestedPage.ClearPrefixInfo();
MemorySlice nodeKey = nestedPage.CreateNewEmptyKey();
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var nodeHeader = nestedPage.GetNode(i);
nestedPage.SetNodeKey(nodeHeader, ref nodeKey);
nodeKey = newNestedPage.PrepareKeyToInsert(nodeKey, i);
newNestedPage.AddDataNode(i, nodeKey, 0,
(ushort)(nodeHeader->Version - 1)); // we dec by one because AdddataNode will inc by one, and we don't want to change those values
}
newNestedPage.Search(value);
newNestedPage.AddDataNode(newNestedPage.LastSearchPosition, newNestedPage.PrepareKeyToInsert(value, newNestedPage.LastSearchPosition), 0, 0);
}
}
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);
}
public void MultiDelete(Slice key, Slice value, ushort? version = null)
{
State.IsModified = true;
Lazy<Cursor> lazy;
var page = FindPageFor(key, out lazy);
if (page == null || page.LastMatch != 0)
{
return; //nothing to delete - key not found
}
page = _tx.ModifyPage(page.PageNumber, page);
var item = page.GetNode(page.LastSearchPosition);
if (item->Flags == NodeFlags.MultiValuePageRef) //multi-value tree exists
{
var tree = OpenOrCreateMultiValueTree(_tx, key, item);
tree.Delete(value, version);
// previously, we would convert back to a simple model if we dropped to a single entry
// however, it doesn't really make sense, once you got enough values to go to an actual nested
// tree, you are probably going to remain that way, or be removed completely.
if (tree.State.EntriesCount != 0)
return;
_tx.TryRemoveMultiValueTree(this, key);
_tx.FreePage(tree.State.RootPageNumber);
Delete(key);
}
else // we use a nested page here
{
var nestedPage = new Page(NodeHeader.DirectAccess(_tx, item), "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item));
var nestedItem = nestedPage.Search(value);
if (nestedItem == null) // value not found
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);
}
nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item))
{
LastSearchPosition = nestedPage.LastSearchPosition
};
CheckConcurrency(key, value, version, nestedItem->Version, TreeActionType.Delete);
nestedPage.RemoveNode(nestedPage.LastSearchPosition);
if (nestedPage.NumberOfEntries == 0)
Delete(key);
}
}
private void ExpandMultiTreeNestedPageSize(Transaction tx, Slice key, Slice value, byte* nestedPagePtr, ushort newSize, int currentSize)
{
Debug.Assert(newSize > currentSize);
TemporaryPage tmp;
using (tx.Environment.GetTemporaryPage(tx, out tmp))
{
var tempPagePointer = tmp.TempPagePointer;
NativeMethods.memcpy(tempPagePointer, nestedPagePtr, currentSize);
Delete(key); // release our current page
Page nestedPage = new Page(tempPagePointer, "multi tree", (ushort)currentSize);
var ptr = DirectAdd(key, newSize);
var newNestedPage = new Page(ptr, "multi tree", newSize)
{
Lower = (ushort)Constants.PageHeaderSize,
Upper = newSize,
Flags = PageFlags.Leaf,
PageNumber = -1L // mark as invalid page number
};
Slice nodeKey = new Slice(SliceOptions.Key);
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var nodeHeader = nestedPage.GetNode(i);
nodeKey.Set(nodeHeader);
newNestedPage.AddDataNode(i, nodeKey, 0,
(ushort)(nodeHeader->Version - 1)); // we dec by one because AdddataNode will inc by one, and we don't want to change those values
}
newNestedPage.Search(value);
newNestedPage.AddDataNode(newNestedPage.LastSearchPosition, value, 0, 0);
}
}
private bool TryUseRecentTransactionPage(MemorySlice key, out Lazy <Cursor> cursor, out Page page, out NodeHeader *node)
{
node = null;
page = null;
cursor = null;
var recentPages = _tx.GetRecentlyFoundPages(this);
if (recentPages == null)
{
return(false);
}
var foundPage = recentPages.Find(key);
if (foundPage == null)
{
return(false);
}
var lastFoundPageNumber = foundPage.Number;
page = _tx.GetReadOnlyPage(lastFoundPageNumber);
if (page.IsLeaf == false)
{
throw new DataException("Index points to a non leaf page");
}
node = page.Search(key); // will set the LastSearchPosition
var cursorPath = foundPage.CursorPath;
var pageCopy = page;
cursor = new Lazy <Cursor>(() =>
{
var c = new Cursor();
foreach (var p in cursorPath)
{
if (p == lastFoundPageNumber)
{
c.Push(pageCopy);
}
else
{
var cursorPage = _tx.GetReadOnlyPage(p);
if (key.Options == SliceOptions.BeforeAllKeys)
{
cursorPage.LastSearchPosition = 0;
}
else if (key.Options == SliceOptions.AfterAllKeys)
{
cursorPage.LastSearchPosition = (ushort)(cursorPage.NumberOfEntries - 1);
}
else if (cursorPage.Search(key) != null)
{
if (cursorPage.LastMatch != 0)
{
cursorPage.LastSearchPosition--;
}
}
c.Push(cursorPage);
}
}
return(c);
});
return(true);
}
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);
}
public void MultiDelete(Slice key, Slice value, ushort?version = null)
{
State.IsModified = true;
Lazy <Cursor> lazy;
NodeHeader * node;
var page = FindPageFor(key, out node, out lazy);
if (page == null || page.LastMatch != 0)
{
return; //nothing to delete - key not found
}
page = _tx.ModifyPage(page.PageNumber, page);
var item = page.GetNode(page.LastSearchPosition);
if (item->Flags == NodeFlags.MultiValuePageRef) //multi-value tree exists
{
var tree = OpenMultiValueTree(_tx, key, item);
tree.Delete(value, version);
// previously, we would convert back to a simple model if we dropped to a single entry
// however, it doesn't really make sense, once you got enough values to go to an actual nested
// tree, you are probably going to remain that way, or be removed completely.
if (tree.State.EntriesCount != 0)
{
return;
}
_tx.TryRemoveMultiValueTree(this, key);
_tx.FreePage(tree.State.RootPageNumber);
Delete(key);
}
else // we use a nested page here
{
var nestedPage = new Page(NodeHeader.DirectAccess(_tx, item), "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item));
var nestedItem = nestedPage.Search(value);
if (nestedItem == null) // value not found
{
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);
}
nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item))
{
LastSearchPosition = nestedPage.LastSearchPosition
};
CheckConcurrency(key, value, version, nestedItem->Version, TreeActionType.Delete);
nestedPage.RemoveNode(nestedPage.LastSearchPosition);
if (nestedPage.NumberOfEntries == 0)
{
Delete(key);
}
}
}
private void ExpandMultiTreeNestedPageSize(Transaction tx, Slice key, Slice value, byte* nestedPagePtr, ushort newSize, int currentSize)
{
Debug.Assert(newSize > currentSize);
TemporaryPage tmp;
using (tx.Environment.GetTemporaryPage(tx, out tmp))
{
var tempPagePointer = tmp.TempPagePointer;
Memory.Copy(tempPagePointer, nestedPagePtr, currentSize);
Delete(key); // release our current page
Page nestedPage = new Page(tempPagePointer, "multi tree", (ushort)currentSize);
var ptr = DirectAdd(key, newSize);
var newNestedPage = new Page(ptr, "multi tree", newSize)
{
Lower = (ushort)Constants.PageHeaderSize,
Upper = KeysPrefixing ? (ushort) (newSize - Constants.PrefixInfoSectionSize) : newSize,
Flags = KeysPrefixing ? PageFlags.Leaf | PageFlags.KeysPrefixed : PageFlags.Leaf,
PageNumber = -1L // mark as invalid page number
};
newNestedPage.ClearPrefixInfo();
MemorySlice nodeKey = nestedPage.CreateNewEmptyKey();
for (int i = 0; i < nestedPage.NumberOfEntries; i++)
{
var nodeHeader = nestedPage.GetNode(i);
nestedPage.SetNodeKey(nodeHeader, ref nodeKey);
nodeKey = newNestedPage.PrepareKeyToInsert(nodeKey, i);
newNestedPage.AddDataNode(i, nodeKey, 0,
(ushort)(nodeHeader->Version - 1)); // we dec by one because AdddataNode will inc by one, and we don't want to change those values
}
newNestedPage.Search(value);
newNestedPage.AddDataNode(newNestedPage.LastSearchPosition, newNestedPage.PrepareKeyToInsert(value, newNestedPage.LastSearchPosition), 0, 0);
}
}
private bool TryUseRecentTransactionPage(MemorySlice key, out Lazy<Cursor> cursor, out Page page, out NodeHeader* node)
{
node = null;
page = null;
cursor = null;
var recentPages = _tx.GetRecentlyFoundPages(this);
if (recentPages == null)
return false;
var foundPage = recentPages.Find(key);
if (foundPage == null)
return false;
var lastFoundPageNumber = foundPage.Number;
page = _tx.GetReadOnlyPage(lastFoundPageNumber);
if (page.IsLeaf == false)
throw new DataException("Index points to a non leaf page");
node = page.Search(key); // will set the LastSearchPosition
var cursorPath = foundPage.CursorPath;
var pageCopy = page;
cursor = new Lazy<Cursor>(() =>
{
var c = new Cursor();
foreach (var p in cursorPath)
{
if (p == lastFoundPageNumber)
c.Push(pageCopy);
else
{
var cursorPage = _tx.GetReadOnlyPage(p);
if (key.Options == SliceOptions.BeforeAllKeys)
{
cursorPage.LastSearchPosition = 0;
}
else if (key.Options == SliceOptions.AfterAllKeys)
{
cursorPage.LastSearchPosition = (ushort)(cursorPage.NumberOfEntries - 1);
}
else if (cursorPage.Search(key) != null)
{
if (cursorPage.LastMatch != 0)
{
cursorPage.LastSearchPosition--;
}
}
c.Push(cursorPage);
}
}
return c;
});
return true;
}