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rocksdb

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RocksDB for Erlang

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rocksdb deps rocksdb db version_builder.h
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deps/rocksdb/db/version_builder.h 

//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).

//

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file. See the AUTHORS file for names of contributors.

//

#pragma once

#include "rocksdb/env.h"

#include "rocksdb/slice_transform.h"



namespace rocksdb {



class TableCache;

class VersionStorageInfo;

class VersionEdit;

struct FileMetaData;

class InternalStats;



// A helper class so we can efficiently apply a whole sequence

// of edits to a particular state without creating intermediate

// Versions that contain full copies of the intermediate state.

class VersionBuilder {

 public:

  VersionBuilder(const EnvOptions& env_options, TableCache* table_cache,

                 VersionStorageInfo* base_vstorage, Logger* info_log = nullptr);

  ~VersionBuilder();

  void CheckConsistency(VersionStorageInfo* vstorage);

  void CheckConsistencyForDeletes(VersionEdit* edit, uint64_t number,

                                  int level);

  bool CheckConsistencyForNumLevels();

  void Apply(VersionEdit* edit);

  void SaveTo(VersionStorageInfo* vstorage);

  void LoadTableHandlers(InternalStats* internal_stats, int max_threads,

                         bool prefetch_index_and_filter_in_cache,

                         const SliceTransform* prefix_extractor);

  void MaybeAddFile(VersionStorageInfo* vstorage, int level, FileMetaData* f);



 private:

  class Rep;

  Rep* rep_;

};



extern bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b);

}  // namespace rocksdb