public void Execute(uint stage, SharpMedia.Database.Physical.Journalling.IService service)
{
// 1) We read previous object placement and change it.
ObjectInfo info = childrenTree.Find(service, (uint)prevName.GetHashCode());
BlockStream stream = BlockStream.FromBase(info.Address, service);
ChildTag childTag = Common.DeserializeFromArray(stream.Read(info.Size)) as ChildTag;
childTag.Remove(prevName);
// Remove it if empty.
if (childTag.IsEmpty)
{
childrenTree.Remove(service, (uint)prevName.GetHashCode(), 1, false);
}
else
{
// Update the entry (now without this child).
byte[] childTagData = Common.SerializeToArray(childTag);
stream = service.AllocationContext.CreateBlockStream((ulong)childTagData.LongLength);
stream.Write(childTagData);
childrenTree.Replace(service,
new ObjectInfo((uint)prevName.GetHashCode(), (ulong)childTagData.LongLength, stream.BaseAddress));
}
// 3) We create new and insert it into tree.
ObjectInfo info2 = childrenTree.Find(service, (uint)newName.GetHashCode());
if (info2 == null)
{
// We create new tag.
childTag = new ChildTag();
childTag.Add(newName, info.Address);
byte[] childTagData = Common.SerializeToArray(childTag);
stream = service.AllocationContext.CreateBlockStream((ulong)childTagData.LongLength);
stream.Write(childTagData);
// And we add child.
childrenTree.Add(service,
new ObjectInfo((uint)newName.GetHashCode(), (ulong)childTagData.LongLength, stream.BaseAddress));
}
else
{
// We append it and release previous tag.
stream = BlockStream.FromBase(info2.Address, service);
childTag = Common.DeserializeFromArray(stream.Read(info2.Size)) as ChildTag;
stream.Deallocate();
// We modify and rewrite it.
childTag.Add(newName, info.Address);
byte[] childTagData = Common.SerializeToArray(childTag);
stream = service.AllocationContext.CreateBlockStream((ulong)childTagData.LongLength);
stream.Write(childTagData);
// We insert into children tree.
childrenTree.Replace(service,
new ObjectInfo((uint)newName.GetHashCode(), (ulong)childTagData.LongLength, info.Address));
}
}
public void Execute(uint stage, SharpMedia.Database.Physical.Journalling.IService service)
{
Debug.Assert(stage == 0);
// 1) We first write to allocated block stream.
BlockStream stream = service.AllocationContext.CreateBlockStream((ulong)objectData.LongLength);
stream.Write(objectData);
// 2) We may need to delete object at index.
ObjectInfo data = tree.Find(service, index);
if (data != null)
{
// Deallocate link.
BlockStream stream2 = BlockStream.FromBase(data.Address, service);
stream2.Deallocate();
// We replace the entry (cheaper than delete and rewrite).
tree.Replace(service, new ObjectInfo(index, (ulong)objectData.LongLength, stream.BaseAddress));
}
else
{
// 3) We execute insert operation.
tree.Add(service, new ObjectInfo(index, (ulong)objectData.LongLength, stream.BaseAddress));
}
}
public static IEnumerable <TResult> Join <TKey, TOuter, TInner, TIndex, TResult>(
IDictionary <TKey, TOuter> outer,
IDictionary <TKey, TInner> inner,
Func <TOuter, TIndex> outKeySelector,
Func <TInner, TIndex> innerKeySelector,
Func <TOuter, TInner, TResult> resultSelector,
BPlusTree <TIndex, TKey> btree)
where TIndex : IComparable <TIndex>
{
var outerEnum = outer.GetEnumerator();
outerEnum.Reset();
while (outerEnum.MoveNext())
{
var item = outerEnum.Current.Value;
var g = btree.Find(outKeySelector(item)).Select(id => inner[id]).ToArray();
if (g != null)
{
for (int i = 0; i < g.Length; i++)
{
yield return(resultSelector(item, g[i]));
}
}
}
}
/// <summary>
/// Executes the operation.
/// </summary>
/// <param name="service">Service for operation.</param>
unsafe void ExecuteInternal(IService service)
{
ulong childrenTS;
ulong versionTS;
// 1) We extract child TS and version TS
Block block = service.Read(BlockType.NodeHeaderBlock, commonAddress);
fixed(byte *p = block.Data)
{
NodeCommonHeader *header = (NodeCommonHeader *)p;
childrenTS = header->ChildrenBTree;
versionTS = header->VersionsBTree;
}
// 2) Can get rid of node.
service.DeAllocate(commonAddress);
// 3) We delete children TS, it should be empty (since deletes were already called on nodes).
service.DeAllocate(childrenTS);
// 4) We go through versions.
BPlusTree versionsTree = new BPlusTree(versionTS);
List <ObjectInfo> versions = versionsTree.ListAll(service);
// 5) We delete each version.
foreach (ObjectInfo info in versions)
{
// a) Read version tag.
BlockStream versionTagStream = BlockStream.FromBase(info.Address, service);
VersionTag versionTag = Common.DeserializeFromArray(versionTagStream.Read(info.Size)) as VersionTag;
versionTagStream.Deallocate();
foreach (KeyValuePair <ulong, ulong> versionToNode in versionTag.VersionAddress)
{
block = service.Read(BlockType.NodeHeaderBlock, versionToNode.Value);
List <ulong> typedStreams = NodeVersionHelper.ListAllTypedStreamsAsAddresses(block, service);
// b) Delete all typed streams.
for (int i = 0; i < typedStreams.Count; i++)
{
// 1) We delete the typed stream object.
block = service.Read(BlockType.TypedStreamHeader, typedStreams[i]);
fixed(byte *p = block.Data)
{
TypedStreamHeader *header = (TypedStreamHeader *)p;
// We delete single object.
if ((header->Options & StreamOptions.SingleObject) != 0)
{
if (header->ObjectsAddress != 0)
{
BlockStream stream = BlockStream.FromBase(header->ObjectsAddress, service);
stream.Deallocate();
}
}
else
{
// We delete all children.
BPlusTree tree = new BPlusTree(header->ObjectsAddress);
foreach (ObjectInfo info2 in tree.ListAll(service))
{
BlockStream stream = BlockStream.FromBase(info2.Address, service);
stream.Deallocate();
}
}
}
// 2) We also delete the header itself.
service.DeAllocate(typedStreams[i]);
}
// c) We deallocate version block.
service.DeAllocate(versionToNode.Value);
}
}
// 6) We delete the tree.
versionsTree.DeallocateTree(service);
// 7) We must erase the node from root.
ObjectInfo childInfo = parentChildTree.Find(service, (uint)childName.GetHashCode());
BlockStream childTagStream = BlockStream.FromBase(childInfo.Address, service);
byte[] childTagData = childTagStream.Read(childInfo.Size);
ChildTag childTag = Common.DeserializeFromArray(childTagData) as ChildTag;
childTagStream.Deallocate();
if (childTag.Children.Count == 1)
{
// Simply delete it.
parentChildTree.Remove(service, (uint)childName.GetHashCode(), 1, false);
}
else
{
// We have to replace it.
childTag.Remove(childName);
childTagData = Common.SerializeToArray(childTag);
childTagStream = service.AllocationContext.CreateBlockStream((ulong)childTagData.LongLength);
childTagStream.Write(childTagData);
parentChildTree.Replace(service, new ObjectInfo((uint)childName.GetHashCode(),
(ulong)childTagData.LongLength, childTagStream.BaseAddress));
}
}
public unsafe void Execute(uint stage, IService service)
{
// 1) We create the node common block.
versionAddress = service.AllocationContext.AllocateBlock();
commonAddress = service.AllocationContext.AllocateBlock();
BPlusTree versionTS = new BPlusTree(service.AllocationContext.CreateEmptyBTree());
// Fill common block and write.
Block commonBlock = new Block(service.BlockSize);
fixed(byte *p = commonBlock.Data)
{
NodeCommonHeader *header = (NodeCommonHeader *)p;
header->ChildrenBTree = service.AllocationContext.CreateEmptyBTree();
header->CurrentVersionAddress = versionAddress;
header->CurrentVersionNumber = 0;
header->HeaderMagic = NodeCommonHeader.Magic;
header->ParentAddress = parentAddress;
header->VersionsBTree = versionTS.RootAddress;
}
service.Write(BlockType.NodeHeaderBlock, commonAddress, commonBlock);
// 2) We create the node default typed stream.
Block tsblock = new Block(service.BlockSize);
ulong tsBlock = service.AllocationContext.AllocateBlock();
fixed(byte *p = tsblock.Data)
{
TypedStreamHeader *header = (TypedStreamHeader *)p;
header->ObjectsAddress = (defaultTSOptions & StreamOptions.SingleObject) == 0 ?
service.AllocationContext.CreateEmptyBTree() : 0;
header->Options = defaultTSOptions;
header->ObjectSize = 0;
int i;
for (i = 0; i < defaultTSType.Length; i++)
{
header->Type[i] = defaultTSType[i];
}
// Null terminate it.
header->Type[i] = '\0';
}
service.Write(BlockType.TypedStreamHeader, tsBlock, tsblock);
// 3) We create the node version block.
// Fill version block and write.
Block versionBlock = new Block(service.BlockSize);
fixed(byte *pp = versionBlock.Data)
{
NodeVersionHeader *header = (NodeVersionHeader *)pp;
header->CreationTime = DateTime.Now;
header->DefaultTypedStream = 0;
header->HeaderMagic = NodeVersionHeader.Magic;
header->ModifiedTime = DateTime.Now;
header->NodeCommonAddress = commonAddress;
header->StreamCount = 0; //< Is actually one but NodeHelper changes this.
header->VersionNumber = 0;
}
// We must add default typed stream to block.
NodeVersionHelper.AddTypedStream(tsBlock, defaultTSType, versionBlock);
service.Write(BlockType.NodeHeaderBlock, versionAddress, versionBlock);
// 4) We add to children tree.
ObjectInfo info = childrenTree.Find(service, (uint)childName.GetHashCode());
if (info == null)
{
// We simply create a new object at address.
ChildTag childTag = new ChildTag();
childTag.HashCode = childName.GetHashCode();
childTag.Add(childName, commonAddress);
byte[] childData = Common.SerializeToArray(childTag);
// We write it to block stream.
BlockStream stream = service.AllocationContext.CreateBlockStream((ulong)childData.LongLength);
stream.Write(childData);
// We now add it to B+ tree.
childrenTree.Add(service, new ObjectInfo((uint)childName.GetHashCode(), (ulong)childData.LongLength, stream.BaseAddress));
}
else
{
// The index at hash already exists, we must add it, first read it.
BlockStream stream = BlockStream.FromBase(info.Address, service);
ChildTag childTag = Common.DeserializeFromArray(stream.Read(info.Size)) as ChildTag;
// Steam not used anymore.
stream.Deallocate();
// We modify child tag.
childTag.Add(childName, commonAddress);
byte[] childData = Common.SerializeToArray(childTag);
// We must write it to new address.
stream = service.AllocationContext.CreateBlockStream((ulong)childData.LongLength);
stream.Write(childData);
// Now we replace the data in tree.
childrenTree.Replace(service,
new ObjectInfo((uint)childName.GetHashCode(), (ulong)childData.LongLength, stream.BaseAddress));
}
// 5) Add version to typed stream.
VersionTag versionTag = new VersionTag((0).GetHashCode());
versionTag.Add(0, versionAddress);
byte[] versionTagData = Common.SerializeToArray(versionTag);
// Write to stream.
BlockStream versionTagStream = service.AllocationContext.CreateBlockStream((ulong)versionTagData.LongLength);
versionTagStream.Write(versionTagData);
versionTS.Add(service, new ObjectInfo((uint)(0).GetHashCode(),
(ulong)versionTagData.LongLength, versionTagStream.BaseAddress));
}
static void Main(string[] args)
{
int j = 0;
Random rand = new Random();
Stopwatch sw = new Stopwatch();
Console.Write("Enter count: ");
int count = int.Parse(Console.ReadLine());
Console.Write("Enter degree: ");
int degree = int.Parse(Console.ReadLine());
Console.Write("Enter alpha: ");
double alpha = double.Parse(Console.ReadLine());
BPlusTree <int, int> tree = new BPlusTree <int, int>(degree, alpha);
Console.Clear();
if (Console.ReadLine().ToLower() == "y")
{
sw.Reset();
sw.Start();
for (int i = 0; i < count; i++)
{
tree.Add(i * 10, i * 10);
}
sw.Stop();
Console.WriteLine("Adding ascending sequence takes {0:f3} s", (double)sw.ElapsedMilliseconds / 1000);
sw.Reset();
sw.Start();
for (int i = 0; i < count; i++)
{
tree.Find(rand.Next(count), out j);
}
sw.Stop();
Console.WriteLine("Finding in ascending sequence takes {0:f3} s", (double)sw.ElapsedMilliseconds / 1000);
GetObjectSize(tree);
sw.Reset();
sw.Start();
for (int i = 0; i < count; i++)
{
tree.Remove(i * 10);
}
sw.Stop();
Console.WriteLine("Removing from ascending sequence takes {0:f3} s", (double)sw.ElapsedMilliseconds / 1000);
}
if (Console.ReadLine().ToLower() == "y")
{
List <int> elements = new List <int>();
for (int i = 0; i < count; i++)
{
elements.Add(i * 10);
}
Sort <int> .SortOut(elements);
Sort <int> .SortOut(elements);
Sort <int> .SortOut(elements);
Sort <int> .SortOut(elements);
Sort <int> .SortOut(elements);
sw.Reset();
sw.Start();
for (int i = 0; i < count; i++)
{
tree.Add(elements[i], elements[i]);
}
sw.Stop();
Console.WriteLine("Adding random sequence takes {0:f3} s", (double)sw.ElapsedMilliseconds / 1000);
sw.Reset();
sw.Start();
for (int i = 0; i < count; i++)
{
tree.Find(rand.Next(count), out j);
}
sw.Stop();
Console.WriteLine("Finding in ascending sequence takes {0:f3} s", (double)sw.ElapsedMilliseconds / 1000);
GetObjectSize(tree);
sw.Reset();
sw.Start();
for (int i = 0; i < count; i++)
{
tree.Remove(elements[i]);
}
sw.Stop();
Console.WriteLine("Removing from ascending sequence takes {0:f3} s", (double)sw.ElapsedMilliseconds / 1000);
Console.ReadLine();
}
}
public unsafe void Execute(uint stage, IService service)
{
ulong versionAddress = service.AllocationContext.AllocateBlock();
// 1) We first create new version node.
Block versionBlock = new Block(service.BlockSize);
fixed(byte *p = versionBlock.Data)
{
NodeVersionHeader *header = (NodeVersionHeader *)p;
header->CreationTime = DateTime.Now;
header->DefaultTypedStream = 0;
header->HeaderMagic = NodeVersionHeader.Magic;
header->ModifiedTime = DateTime.Now;
header->NodeCommonAddress = commonAddress;
header->StreamCount = 0; //< For now 0.
header->VersionNumber = version;
}
// 2) We create default TS.
ulong defaultTSAddress = service.AllocationContext.AllocateBlock();
Block block = new Block(service.BlockSize);
fixed(byte *p = block.Data)
{
TypedStreamHeader *header = (TypedStreamHeader *)p;
header->ObjectsAddress = (defaultTSOptions & StreamOptions.SingleObject) != 0
? 0 : service.AllocationContext.CreateEmptyBTree();
header->ObjectSize = 0;
header->Options = defaultTSOptions;
// Copy the name.
int i;
for (i = 0; i < defaultTSType.Length; i++)
{
header->Type[i] = defaultTSType[i];
}
header->Type[i] = '\0';
}
service.Write(BlockType.TypedStreamHeader, defaultTSAddress, block);
// 3) We add the default typed stream and write it.
NodeVersionHelper.AddTypedStream(defaultTSAddress, defaultTSType, versionBlock);
service.Write(BlockType.NodeHeaderBlock, versionAddress, versionBlock);
// 4) And finnaly add to versions.
ObjectInfo info = versionTree.Find(service, (uint)version.GetHashCode());
if (info == null)
{
// Create block stream.
VersionTag versionTag = new VersionTag(version.GetHashCode());
versionTag.Add(version, versionAddress);
byte[] versionTagData = Common.SerializeToArray(versionTag);
BlockStream stream = service.AllocationContext.CreateBlockStream((ulong)versionTagData.LongLength);
// Write the stream.
stream.Write(versionTagData);
// And to B+ tree.
versionTree.Add(service, new ObjectInfo((uint)version.GetHashCode(),
(ulong)versionTagData.LongLength, stream.BaseAddress));;
}
else
{
// We first create appropriate VersionTag and kill the stream.
BlockStream stream = BlockStream.FromBase(info.Address, service);
VersionTag versionTag = Common.DeserializeFromArray(stream.Read(info.Size)) as VersionTag;
versionTag.Add(version, versionAddress);
stream.Deallocate();
// We write a new version tag.
byte[] versionTagData = Common.SerializeToArray(versionTag);
stream = service.AllocationContext.CreateBlockStream((ulong)versionTagData.LongLength);
stream.Write(versionTagData);
// We replace in B+ tree.
versionTree.Replace(service, new ObjectInfo((uint)version.GetHashCode(),
(ulong)versionTagData.LongLength, versionAddress));
}
// 5) The new version is replaced in common.
block = service.Read(BlockType.NodeHeaderBlock, commonAddress);
fixed(byte *p = block.Data)
{
NodeCommonHeader *header = (NodeCommonHeader *)p;
header->CurrentVersionNumber = version;
header->CurrentVersionAddress = versionAddress;
}
service.Write(BlockType.NodeHeaderBlock, commonAddress, block);
}
