76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
#pragma once
|
|
#ifndef MESSMER_BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_DATATREE_H_
|
|
#define MESSMER_BLOBSTORE_IMPLEMENTATIONS_ONBLOCKS_DATATREE_H_
|
|
|
|
#include <memory>
|
|
#include <cpp-utils/macros.h>
|
|
#include <cpp-utils/pointer/optional_ownership_ptr.h>
|
|
#include "../datanodestore/DataNodeView.h"
|
|
//TODO Replace with C++14 once std::shared_mutex is supported
|
|
#include <boost/thread/shared_mutex.hpp>
|
|
#include <blockstore/utils/BlockId.h>
|
|
#include "LeafHandle.h"
|
|
|
|
namespace blobstore {
|
|
namespace onblocks {
|
|
namespace datanodestore {
|
|
class DataNodeStore;
|
|
class DataInnerNode;
|
|
class DataLeafNode;
|
|
class DataNode;
|
|
}
|
|
namespace datatreestore {
|
|
|
|
//TODO It is strange that DataLeafNode is still part in the public interface of DataTree. This should be separated somehow.
|
|
class DataTree final {
|
|
public:
|
|
DataTree(datanodestore::DataNodeStore *nodeStore, cpputils::unique_ref<datanodestore::DataNode> rootNode);
|
|
~DataTree();
|
|
|
|
const blockstore::BlockId &blockId() const;
|
|
//Returning uint64_t, because calculations handling this probably need to be done in 64bit to support >4GB blobs.
|
|
uint64_t maxBytesPerLeaf() const;
|
|
|
|
void traverseLeaves(uint32_t beginIndex, uint32_t endIndex, std::function<void (uint32_t index, bool isRightBorderLeaf, LeafHandle leaf)> onExistingLeaf, std::function<cpputils::Data (uint32_t index)> onCreateLeaf);
|
|
void resizeNumBytes(uint64_t newNumBytes);
|
|
|
|
uint32_t numLeaves() const;
|
|
uint64_t numStoredBytes() const;
|
|
|
|
uint8_t depth() const;
|
|
|
|
// only used by test cases
|
|
uint32_t _forceComputeNumLeaves() const;
|
|
|
|
void flush() const;
|
|
|
|
private:
|
|
mutable boost::shared_mutex _mutex;
|
|
datanodestore::DataNodeStore *_nodeStore;
|
|
cpputils::unique_ref<datanodestore::DataNode> _rootNode;
|
|
blockstore::BlockId _blockId; // BlockId is stored in a member variable, since _rootNode is nullptr while traversing, but we still want to be able to return the blockId.
|
|
mutable boost::optional<uint32_t> _numLeavesCache;
|
|
|
|
cpputils::unique_ref<datanodestore::DataNode> releaseRootNode();
|
|
friend class DataTreeStore;
|
|
|
|
//TODO Use underscore for private methods
|
|
void _traverseLeaves(uint32_t beginIndex, uint32_t endIndex,
|
|
std::function<void (uint32_t index, bool isRightBorderLeaf, LeafHandle leaf)> onExistingLeaf,
|
|
std::function<cpputils::Data (uint32_t index)> onCreateLeaf,
|
|
std::function<void (datanodestore::DataInnerNode *node)> onBacktrackFromSubtree);
|
|
uint32_t leavesPerFullChild(const datanodestore::DataInnerNode &root) const;
|
|
uint64_t _numStoredBytes() const;
|
|
uint64_t _numStoredBytes(const datanodestore::DataNode &root) const;
|
|
uint32_t _numLeaves() const;
|
|
uint32_t _computeNumLeaves(const datanodestore::DataNode &node) const;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(DataTree);
|
|
};
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|