public unsafe void Execute(uint stage, SharpMedia.Database.Physical.Journalling.IService service)
{
// 1) We first delete header node entry.
Block versionNodeBlock = service.Read(BlockType.NodeHeaderBlock, nodeVersionAddress);
ulong tsHeaderAddress = NodeVersionHelper.RemoveTypedStream(tsToDeleteIndex, versionNodeBlock);
// 2) We delete all objects.
Block tsHeader = service.Read(BlockType.TypedStreamHeader, tsHeaderAddress);
fixed(byte *p = tsHeader.Data)
{
TypedStreamHeader *header = (TypedStreamHeader *)p;
if ((header->Options & StreamOptions.SingleObject) != 0)
{
BlockStream stream = BlockStream.FromBase(header->ObjectsAddress, service);
stream.Deallocate();
}
else
{
// We have to delete whole link.
BPlusTree tree = new BPlusTree(header->ObjectsAddress);
List <ObjectInfo> all = tree.ListAll(service);
foreach (ObjectInfo info in all)
{
BlockStream stream = BlockStream.FromBase(info.Address, service);
stream.Deallocate();
}
// Make sure we get rid of tree.
tree.DeallocateTree(service);
}
}
// 3) We delete typed stream.
service.DeAllocate(tsHeaderAddress);
}
/// <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));
}
}
