rocksdb/db/job_context.h

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same 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 <string>
#include <vector>
#include "db/column_family.h"
namespace rocksdb {
class MemTable;
struct JobContext {
inline bool HaveSomethingToDelete() const {
return candidate_files.size() || sst_delete_files.size() ||
log_delete_files.size();
}
// Structure to store information for candidate files to delete.
struct CandidateFileInfo {
std::string file_name;
uint32_t path_id;
CandidateFileInfo(std::string name, uint32_t path)
: file_name(std::move(name)), path_id(path) {}
bool operator==(const CandidateFileInfo& other) const {
return file_name == other.file_name && path_id == other.path_id;
}
};
// a list of all files that we'll consider deleting
// (every once in a while this is filled up with all files
// in the DB directory)
std::vector<CandidateFileInfo> candidate_files;
// the list of all live sst files that cannot be deleted
std::vector<FileDescriptor> sst_live;
// a list of sst files that we need to delete
std::vector<FileMetaData*> sst_delete_files;
// a list of log files that we need to delete
std::vector<uint64_t> log_delete_files;
// a list of memtables to be free
autovector<MemTable*> memtables_to_free;
autovector<SuperVersion*> superversions_to_free;
SuperVersion* new_superversion; // if nullptr no new superversion
// the current manifest_file_number, log_number and prev_log_number
// that corresponds to the set of files in 'live'.
uint64_t manifest_file_number, pending_manifest_file_number, log_number,
prev_log_number;
explicit JobContext(bool create_superversion = false) {
manifest_file_number = 0;
pending_manifest_file_number = 0;
log_number = 0;
prev_log_number = 0;
new_superversion = create_superversion ? new SuperVersion() : nullptr;
}
~JobContext() {
// free pending memtables
for (auto m : memtables_to_free) {
delete m;
}
// free superversions
for (auto s : superversions_to_free) {
delete s;
}
// if new_superversion was not used, it will be non-nullptr and needs
// to be freed here
delete new_superversion;
}
};
} // namespace rocksdb