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rocksdb/db/version_builder.h

92 lines
3.0 KiB

// 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 <memory>
#include "db/version_edit.h"
#include "rocksdb/file_system.h"
#include "rocksdb/metadata.h"
#include "rocksdb/slice_transform.h"
namespace ROCKSDB_NAMESPACE {
struct ImmutableCFOptions;
class TableCache;
class VersionStorageInfo;
class VersionEdit;
struct FileMetaData;
class InternalStats;
class Version;
class VersionSet;
class ColumnFamilyData;
class CacheReservationManager;
// 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 FileOptions& file_options,
const ImmutableCFOptions* ioptions, TableCache* table_cache,
VersionStorageInfo* base_vstorage, VersionSet* version_set,
std::shared_ptr<CacheReservationManager>
file_metadata_cache_res_mgr = nullptr);
~VersionBuilder();
bool CheckConsistencyForNumLevels();
Status Apply(const VersionEdit* edit);
Status SaveTo(VersionStorageInfo* vstorage) const;
Status LoadTableHandlers(
InternalStats* internal_stats, int max_threads,
bool prefetch_index_and_filter_in_cache, bool is_initial_load,
const std::shared_ptr<const SliceTransform>& prefix_extractor,
size_t max_file_size_for_l0_meta_pin);
uint64_t GetMinOldestBlobFileNumber() const;
private:
class Rep;
std::unique_ptr<Rep> rep_;
};
// A wrapper of version builder which references the current version in
// constructor and unref it in the destructor.
// Both of the constructor and destructor need to be called inside DB Mutex.
class BaseReferencedVersionBuilder {
public:
explicit BaseReferencedVersionBuilder(ColumnFamilyData* cfd);
BaseReferencedVersionBuilder(ColumnFamilyData* cfd, Version* v);
~BaseReferencedVersionBuilder();
VersionBuilder* version_builder() const { return version_builder_.get(); }
private:
std::unique_ptr<VersionBuilder> version_builder_;
Version* version_;
};
class NewestFirstBySeqNo {
public:
bool operator()(const FileMetaData* lhs, const FileMetaData* rhs) const {
assert(lhs);
assert(rhs);
if (lhs->fd.largest_seqno != rhs->fd.largest_seqno) {
return lhs->fd.largest_seqno > rhs->fd.largest_seqno;
}
if (lhs->fd.smallest_seqno != rhs->fd.smallest_seqno) {
return lhs->fd.smallest_seqno > rhs->fd.smallest_seqno;
}
// Break ties by file number
return lhs->fd.GetNumber() > rhs->fd.GetNumber();
}
};
} // namespace ROCKSDB_NAMESPACE