mirror of https://github.com/facebook/rocksdb.git
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
// 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
|