本文整理汇总了C#中Voron.Trees.Page.WritePrefix方法的典型用法代码示例。如果您正苦于以下问题：C# Page.WritePrefix方法的具体用法？C# Page.WritePrefix怎么用？C# Page.WritePrefix使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Voron.Trees.Page的用法示例。
在下文中一共展示了Page.WritePrefix方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: SplitPageInHalf
private byte* SplitPageInHalf(Page rightPage)
{
int currentIndex = _page.LastSearchPosition;
bool newPosition = true;
int splitIndex = _page.NumberOfEntries/2;
if (currentIndex < splitIndex)
newPosition = false;
PrefixNode[] prefixes = null;
if (_tree.KeysPrefixing && _page.HasPrefixes)
{
prefixes = _page.GetPrefixes();
}
if (_page.IsLeaf || prefixes != null)
{
splitIndex = AdjustSplitPosition(currentIndex, splitIndex, prefixes, ref newPosition);
}
var currentKey = _page.GetNodeKey(splitIndex);
// here the current key is the separator key and can go either way, so
// use newPosition to decide if it stays on the left node or moves to the right
MemorySlice seperatorKey;
if (currentIndex == splitIndex && newPosition)
{
seperatorKey = currentKey.Compare(_newKey) < 0 ? currentKey : _newKey;
}
else
{
seperatorKey = currentKey;
}
AddSeparatorToParentPage(rightPage.PageNumber, seperatorKey);
MemorySlice instance = _page.CreateNewEmptyKey();
if (prefixes != null)
{
for (int i = 0; i < prefixes.Length; i++)
{
var prefix = prefixes[i];
rightPage.WritePrefix(new Slice(prefix.ValuePtr, prefix.PrefixLength), i);
}
}
// move the actual entries from page to right page
ushort nKeys = _page.NumberOfEntries;
for (int i = splitIndex; i < nKeys; i++)
{
NodeHeader* node = _page.GetNode(i);
if (_page.IsBranch && rightPage.NumberOfEntries == 0)
{
rightPage.CopyNodeDataToEndOfPage(node, _tree.KeysPrefixing ? (MemorySlice) PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys);
}
else
{
_page.SetNodeKey(node, ref instance);
var key = rightPage.PrepareKeyToInsert(instance, rightPage.NumberOfEntries);
rightPage.CopyNodeDataToEndOfPage(node, key);
}
}
_page.Truncate(_tx, splitIndex);
// actually insert the new key
try
{
return (currentIndex > splitIndex || newPosition && currentIndex == splitIndex)
? InsertNewKey(rightPage)
: InsertNewKey(_page);
}
catch (InvalidOperationException e)
{
if (e.Message.StartsWith("The page is full and cannot add an entry"))
{
var debugInfo = new StringBuilder();
debugInfo.AppendFormat("\r\n_tree.Name: {0}\r\n", _tree.Name);
debugInfo.AppendFormat("_newKey: {0}, _len: {1}, needed space: {2}\r\n", _newKey, _len, _page.GetRequiredSpace(_newKey, _len));
debugInfo.AppendFormat("currentKey: {0}, seperatorKey: {1}\r\n", currentKey, seperatorKey);
debugInfo.AppendFormat("currentIndex: {0}\r\n", currentIndex);
debugInfo.AppendFormat("splitIndex: {0}\r\n", splitIndex);
debugInfo.AppendFormat("newPosition: {0}\r\n", newPosition);
debugInfo.AppendFormat("_page info: flags - {0}, # of entries {1}, size left: {2}, calculated size left: {3}\r\n", _page.Flags, _page.NumberOfEntries, _page.SizeLeft, _page.CalcSizeLeft());
for (int i = 0; i < _page.NumberOfEntries; i++)
{
var node = _page.GetNode(i);
var key = _page.GetNodeKey(node);
debugInfo.AppendFormat("{0} - {2} {1}\r\n", key,
node->DataSize, node->Flags == NodeFlags.Data ? "Size" : "Page");
}
debugInfo.AppendFormat("rightPage info: flags - {0}, # of entries {1}, size left: {2}, calculated size left: {3}\r\n", rightPage.Flags, rightPage.NumberOfEntries, rightPage.SizeLeft, rightPage.CalcSizeLeft());
for (int i = 0; i < rightPage.NumberOfEntries; i++)
//.........这里部分代码省略.........
示例2: SplitPageInHalf
private byte* SplitPageInHalf(Page rightPage)
{
bool toRight;
var currentIndex = _page.LastSearchPosition;
var splitIndex = _page.NumberOfEntries / 2;
if (currentIndex <= splitIndex)
{
toRight = false;
}
else
{
toRight = true;
var leftPageEntryCount = splitIndex;
var rightPageEntryCount = _page.NumberOfEntries - leftPageEntryCount + 1;
if (rightPageEntryCount > leftPageEntryCount)
{
splitIndex++;
Debug.Assert(splitIndex < _page.NumberOfEntries);
}
}
PrefixNode[] prefixes = null;
if (_tree.KeysPrefixing && _page.HasPrefixes)
{
prefixes = _page.GetPrefixes();
}
if (_page.IsLeaf || prefixes != null)
{
splitIndex = AdjustSplitPosition(currentIndex, splitIndex, prefixes, ref toRight);
}
var currentKey = _page.GetNodeKey(splitIndex);
MemorySlice seperatorKey;
if (toRight && splitIndex == currentIndex)
{
seperatorKey = currentKey.Compare(_newKey) < 0 ? currentKey : _newKey;
}
else
{
seperatorKey = currentKey;
}
AddSeparatorToParentPage(rightPage.PageNumber, seperatorKey);
MemorySlice instance = _page.CreateNewEmptyKey();
if (prefixes != null)
{
for (int i = 0; i < prefixes.Length; i++)
{
var prefix = prefixes[i];
rightPage.WritePrefix(new Slice(prefix.ValuePtr, prefix.PrefixLength), i);
}
}
bool addedAsImplicitRef = false;
if (_page.IsBranch && toRight && seperatorKey == _newKey)
{
// _newKey needs to be inserted as first key (BeforeAllKeys) to the right page, so we need to add it before we move entries from the current page
AddNodeToPage(rightPage, 0, _tree.KeysPrefixing ? (MemorySlice)PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys);
addedAsImplicitRef = true;
}
// move the actual entries from page to right page
ushort nKeys = _page.NumberOfEntries;
for (int i = splitIndex; i < nKeys; i++)
{
NodeHeader* node = _page.GetNode(i);
if (_page.IsBranch && rightPage.NumberOfEntries == 0)
{
rightPage.CopyNodeDataToEndOfPage(node, _tree.KeysPrefixing ? (MemorySlice) PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys);
}
else
{
_page.SetNodeKey(node, ref instance);
var key = rightPage.PrepareKeyToInsert(instance, rightPage.NumberOfEntries);
rightPage.CopyNodeDataToEndOfPage(node, key);
}
}
_page.Truncate(_tx, splitIndex);
byte* pos;
if (addedAsImplicitRef == false)
{
try
{
// actually insert the new key
//.........这里部分代码省略.........