ceph/src/rocksdb/db/version_builder.h

   1 //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under the BSD-style license found in the
   3 //  LICENSE file in the root directory of this source tree. An additional grant
   4 //  of patent rights can be found in the PATENTS file in the same 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
  13 namespace rocksdb {
  14
  15 class TableCache;
  16 class VersionStorageInfo;
  17 class VersionEdit;
  18 struct FileMetaData;
  19 class InternalStats;
  20
  21 // A helper class so we can efficiently apply a whole sequence
  22 // of edits to a particular state without creating intermediate
  23 // Versions that contain full copies of the intermediate state.
  24 class VersionBuilder {
  25  public:
  26   VersionBuilder(const EnvOptions& env_options, TableCache* table_cache,
  27                  VersionStorageInfo* base_vstorage, Logger* info_log = nullptr);
  28   ~VersionBuilder();
  29   void CheckConsistency(VersionStorageInfo* vstorage);
  30   void CheckConsistencyForDeletes(VersionEdit* edit, uint64_t number,
  31                                   int level);
  32   void Apply(VersionEdit* edit);
  33   void SaveTo(VersionStorageInfo* vstorage);
  34   void LoadTableHandlers(InternalStats* internal_stats, int max_threads,
  35                          bool prefetch_index_and_filter_in_cache);
  36   void MaybeAddFile(VersionStorageInfo* vstorage, int level, FileMetaData* f);
  37
  38  private:
  39   class Rep;
  40   Rep* rep_;
  41 };
  42
  43 extern bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b);
  44 }  // namespace rocksdb