mirror of https://github.com/facebook/rocksdb.git
125 lines
4.6 KiB
C++
125 lines
4.6 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 "db/version_builder.h"
|
|
#include "db/version_edit.h"
|
|
#include "db/version_set.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
typedef std::unique_ptr<BaseReferencedVersionBuilder> VersionBuilderUPtr;
|
|
|
|
// A class used for scanning MANIFEST file.
|
|
// VersionEditHandler reads a MANIFEST file, parses the version edits, and
|
|
// builds the version set's in-memory state, e.g. the version storage info for
|
|
// the versions of column families.
|
|
// To use this class and its subclasses,
|
|
// 1. Create an object of VersionEditHandler or its subclasses.
|
|
// VersionEditHandler handler(read_only, column_families, version_set,
|
|
// track_missing_files, ignore_missing_files);
|
|
// 2. Status s = handler.Iterate(reader, &db_id);
|
|
// 3. Check s and handle possible errors.
|
|
//
|
|
// Not thread-safe, external synchronization is necessary if an object of
|
|
// VersionEditHandler is shared by multiple threads.
|
|
class VersionEditHandler {
|
|
public:
|
|
explicit VersionEditHandler(
|
|
bool read_only,
|
|
const std::vector<ColumnFamilyDescriptor>& column_families,
|
|
VersionSet* version_set, bool track_missing_files,
|
|
bool ignore_missing_files);
|
|
|
|
virtual ~VersionEditHandler() {}
|
|
|
|
void Iterate(log::Reader& reader, Status* log_read_status,
|
|
std::string* db_id);
|
|
|
|
const Status& status() const { return status_; }
|
|
|
|
bool HasMissingFiles() const;
|
|
|
|
protected:
|
|
Status ApplyVersionEdit(VersionEdit& edit, ColumnFamilyData** cfd);
|
|
|
|
Status OnColumnFamilyAdd(VersionEdit& edit, ColumnFamilyData** cfd);
|
|
|
|
Status OnColumnFamilyDrop(VersionEdit& edit, ColumnFamilyData** cfd);
|
|
|
|
Status OnNonCfOperation(VersionEdit& edit, ColumnFamilyData** cfd);
|
|
|
|
Status Initialize();
|
|
|
|
void CheckColumnFamilyId(const VersionEdit& edit, bool* cf_in_not_found,
|
|
bool* cf_in_builders) const;
|
|
|
|
virtual void CheckIterationResult(const log::Reader& reader, Status* s);
|
|
|
|
ColumnFamilyData* CreateCfAndInit(const ColumnFamilyOptions& cf_options,
|
|
const VersionEdit& edit);
|
|
|
|
virtual ColumnFamilyData* DestroyCfAndCleanup(const VersionEdit& edit);
|
|
|
|
virtual Status MaybeCreateVersion(const VersionEdit& edit,
|
|
ColumnFamilyData* cfd,
|
|
bool force_create_version);
|
|
|
|
Status LoadTables(ColumnFamilyData* cfd,
|
|
bool prefetch_index_and_filter_in_cache,
|
|
bool is_initial_load);
|
|
|
|
const bool read_only_;
|
|
const std::vector<ColumnFamilyDescriptor>& column_families_;
|
|
Status status_;
|
|
VersionSet* version_set_;
|
|
AtomicGroupReadBuffer read_buffer_;
|
|
std::unordered_map<uint32_t, VersionBuilderUPtr> builders_;
|
|
std::unordered_map<std::string, ColumnFamilyOptions> name_to_options_;
|
|
std::unordered_map<uint32_t, std::string> column_families_not_found_;
|
|
VersionEditParams version_edit_params_;
|
|
const bool track_missing_files_;
|
|
std::unordered_map<uint32_t, std::unordered_set<uint64_t>>
|
|
cf_to_missing_files_;
|
|
bool no_error_if_table_files_missing_;
|
|
|
|
private:
|
|
Status ExtractInfoFromVersionEdit(ColumnFamilyData* cfd,
|
|
const VersionEdit& edit);
|
|
|
|
bool initialized_;
|
|
};
|
|
|
|
// A class similar to its base class, i.e. VersionEditHandler.
|
|
// VersionEditHandlerPointInTime restores the versions to the most recent point
|
|
// in time such that at this point, the version does not have missing files.
|
|
//
|
|
// Not thread-safe, external synchronization is necessary if an object of
|
|
// VersionEditHandlerPointInTime is shared by multiple threads.
|
|
class VersionEditHandlerPointInTime : public VersionEditHandler {
|
|
public:
|
|
VersionEditHandlerPointInTime(
|
|
bool read_only,
|
|
const std::vector<ColumnFamilyDescriptor>& column_families,
|
|
VersionSet* version_set);
|
|
~VersionEditHandlerPointInTime() override;
|
|
|
|
protected:
|
|
void CheckIterationResult(const log::Reader& reader, Status* s) override;
|
|
ColumnFamilyData* DestroyCfAndCleanup(const VersionEdit& edit) override;
|
|
Status MaybeCreateVersion(const VersionEdit& edit, ColumnFamilyData* cfd,
|
|
bool force_create_version) override;
|
|
|
|
private:
|
|
std::unordered_map<uint32_t, Version*> versions_;
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|