ceph/src/rocksdb/db/version_builder.h

   1 //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5 //
   6 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
   7 // Use of this source code is governed by a BSD-style license that can be
   8 // found in the LICENSE file. See the AUTHORS file for names of contributors.
   9 //
  10 #pragma once
  11 #include "rocksdb/env.h"
  12 #include "rocksdb/slice_transform.h"
  13
  14 namespace rocksdb {
  15
  16 class TableCache;
  17 class VersionStorageInfo;
  18 class VersionEdit;
  19 struct FileMetaData;
  20 class InternalStats;
  21
  22 // A helper class so we can efficiently apply a whole sequence
  23 // of edits to a particular state without creating intermediate
  24 // Versions that contain full copies of the intermediate state.
  25 class VersionBuilder {
  26  public:
  27   VersionBuilder(const EnvOptions& env_options, TableCache* table_cache,
  28                  VersionStorageInfo* base_vstorage, Logger* info_log = nullptr);
  29   ~VersionBuilder();
  30   void CheckConsistency(VersionStorageInfo* vstorage);
  31   void CheckConsistencyForDeletes(VersionEdit* edit, uint64_t number,
  32                                   int level);
  33   bool CheckConsistencyForNumLevels();
  34   void Apply(VersionEdit* edit);
  35   void SaveTo(VersionStorageInfo* vstorage);
  36   Status LoadTableHandlers(InternalStats* internal_stats, int max_threads,
  37                            bool prefetch_index_and_filter_in_cache,
  38                            bool is_initial_load,
  39                            const SliceTransform* prefix_extractor);
  40   void MaybeAddFile(VersionStorageInfo* vstorage, int level, FileMetaData* f);
  41
  42  private:
  43   class Rep;
  44   Rep* rep_;
  45 };
  46
  47 extern bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b);
  48 }  // namespace rocksdb