mirror of https://github.com/facebook/rocksdb.git
66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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#pragma once
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#include <memory>
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#include "rocksdb/file_system.h"
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#include "rocksdb/slice_transform.h"
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namespace ROCKSDB_NAMESPACE {
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class TableCache;
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class VersionStorageInfo;
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class VersionEdit;
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struct FileMetaData;
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class InternalStats;
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class Version;
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class ColumnFamilyData;
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// A helper class so we can efficiently apply a whole sequence
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// of edits to a particular state without creating intermediate
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// Versions that contain full copies of the intermediate state.
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class VersionBuilder {
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public:
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VersionBuilder(const FileOptions& file_options, TableCache* table_cache,
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VersionStorageInfo* base_vstorage, Logger* info_log = nullptr);
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~VersionBuilder();
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bool CheckConsistencyForNumLevels();
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Status Apply(VersionEdit* edit);
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Status SaveTo(VersionStorageInfo* vstorage);
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Status LoadTableHandlers(InternalStats* internal_stats, int max_threads,
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bool prefetch_index_and_filter_in_cache,
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bool is_initial_load,
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const SliceTransform* prefix_extractor);
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private:
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class Rep;
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std::unique_ptr<Rep> rep_;
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};
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// A wrapper of version builder which references the current version in
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// constructor and unref it in the destructor.
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// Both of the constructor and destructor need to be called inside DB Mutex.
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class BaseReferencedVersionBuilder {
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public:
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explicit BaseReferencedVersionBuilder(ColumnFamilyData* cfd);
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BaseReferencedVersionBuilder(ColumnFamilyData* cfd, Version* v);
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~BaseReferencedVersionBuilder();
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VersionBuilder* version_builder() const { return version_builder_.get(); }
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private:
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std::unique_ptr<VersionBuilder> version_builder_;
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Version* version_;
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};
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extern bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b);
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} // namespace ROCKSDB_NAMESPACE
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