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