rocksdb/db/version_edit.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 <set>
#include <utility>
#include <vector>
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#include <string>
#include "db/dbformat.h"
namespace rocksdb {
class VersionSet;
struct FileMetaData {
int refs;
int allowed_seeks; // Seeks allowed until compaction
uint64_t number;
uint64_t file_size; // File size in bytes
InternalKey smallest; // Smallest internal key served by table
InternalKey largest; // Largest internal key served by table
bool being_compacted; // Is this file undergoing compaction?
SequenceNumber smallest_seqno;// The smallest seqno in this file
SequenceNumber largest_seqno; // The largest seqno in this file
FileMetaData() : refs(0), allowed_seeks(1 << 30), file_size(0),
being_compacted(false) {}
};
class VersionEdit {
public:
VersionEdit() { Clear(); }
~VersionEdit() { }
void Clear();
void SetComparatorName(const Slice& name) {
has_comparator_ = true;
comparator_ = name.ToString();
}
void SetLogNumber(uint64_t num) {
has_log_number_ = true;
log_number_ = num;
}
void SetPrevLogNumber(uint64_t num) {
has_prev_log_number_ = true;
prev_log_number_ = num;
}
void SetNextFile(uint64_t num) {
has_next_file_number_ = true;
next_file_number_ = num;
}
void SetLastSequence(SequenceNumber seq) {
has_last_sequence_ = true;
last_sequence_ = seq;
}
// Add the specified file at the specified number.
// REQUIRES: This version has not been saved (see VersionSet::SaveTo)
// REQUIRES: "smallest" and "largest" are smallest and largest keys in file
void AddFile(int level, uint64_t file,
uint64_t file_size,
const InternalKey& smallest,
const InternalKey& largest,
const SequenceNumber& smallest_seqno,
const SequenceNumber& largest_seqno) {
FileMetaData f;
f.number = file;
f.file_size = file_size;
f.smallest = smallest;
f.largest = largest;
f.smallest_seqno = smallest_seqno;
f.largest_seqno = largest_seqno;
assert(smallest_seqno <= largest_seqno);
new_files_.push_back(std::make_pair(level, f));
}
// Delete the specified "file" from the specified "level".
void DeleteFile(int level, uint64_t file) {
deleted_files_.insert(std::make_pair(level, file));
}
// Number of edits
int NumEntries() {
return new_files_.size() + deleted_files_.size();
}
void SetColumnFamily(uint32_t column_family_id) {
column_family_ = column_family_id;
}
// set column family ID by calling SetColumnFamily()
void AddColumnFamily(const std::string& name) {
assert(!is_column_family_drop_);
assert(!is_column_family_add_);
assert(NumEntries() == 0);
is_column_family_add_ = true;
column_family_name_ = name;
}
// set column family ID by calling SetColumnFamily()
void DropColumnFamily() {
assert(!is_column_family_drop_);
assert(!is_column_family_add_);
assert(NumEntries() == 0);
is_column_family_drop_ = true;
}
void EncodeTo(std::string* dst) const;
Status DecodeFrom(const Slice& src);
std::string DebugString(bool hex_key = false) const;
private:
friend class VersionSet;
typedef std::set< std::pair<int, uint64_t> > DeletedFileSet;
bool GetLevel(Slice* input, int* level, const char** msg);
int max_level_;
std::string comparator_;
uint64_t log_number_;
uint64_t prev_log_number_;
uint64_t next_file_number_;
SequenceNumber last_sequence_;
bool has_comparator_;
bool has_log_number_;
bool has_prev_log_number_;
bool has_next_file_number_;
bool has_last_sequence_;
DeletedFileSet deleted_files_;
std::vector< std::pair<int, FileMetaData> > new_files_;
// Each version edit record should have column_family_id set
// If it's not set, it is default (0)
uint32_t column_family_;
// a version edit can be either column_family add or
// column_family drop. If it's column family add,
// it also includes column family name.
bool is_column_family_drop_;
bool is_column_family_add_;
std::string column_family_name_;
};
} // namespace rocksdb