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// 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/db_impl/db_impl.h"
#include "rocksdb/stats_history.h"
namespace ROCKSDB_NAMESPACE {
extern const std::string kFormatVersionKeyString;
extern const std::string kCompatibleVersionKeyString;
extern const uint64_t kStatsCFCurrentFormatVersion;
extern const uint64_t kStatsCFCompatibleFormatVersion;
enum StatsVersionKeyType : uint32_t {
kFormatVersion = 1,
kCompatibleVersion = 2,
kKeyTypeMax = 3
};
// Read the version number from persitent stats cf depending on type provided
// stores the version number in `*version_number`
// returns Status::OK() on success, or other status code on failure
Status DecodePersistentStatsVersionNumber(DBImpl* db, StatsVersionKeyType type,
uint64_t* version_number);
// Encode timestamp and stats key into buf
// Format: timestamp(10 digit) + '#' + key
// Total length of encoded key will be capped at 100 bytes
int EncodePersistentStatsKey(uint64_t timestamp, const std::string& key,
int size, char* buf);
void OptimizeForPersistentStats(ColumnFamilyOptions* cfo);
class PersistentStatsHistoryIterator final : public StatsHistoryIterator {
public:
PersistentStatsHistoryIterator(uint64_t start_time, uint64_t end_time,
DBImpl* db_impl)
: time_(0),
start_time_(start_time),
end_time_(end_time),
valid_(true),
db_impl_(db_impl) {
AdvanceIteratorByTime(start_time_, end_time_);
}
~PersistentStatsHistoryIterator() override;
bool Valid() const override;
Status status() const override;
void Next() override;
uint64_t GetStatsTime() const override;
const std::map<std::string, uint64_t>& GetStatsMap() const override;
private:
// advance the iterator to the next stats history record with timestamp
// between [start_time, end_time)
void AdvanceIteratorByTime(uint64_t start_time, uint64_t end_time);
// No copying allowed
PersistentStatsHistoryIterator(const PersistentStatsHistoryIterator&) =
delete;
void operator=(const PersistentStatsHistoryIterator&) = delete;
PersistentStatsHistoryIterator(PersistentStatsHistoryIterator&&) = delete;
PersistentStatsHistoryIterator& operator=(PersistentStatsHistoryIterator&&) =
delete;
uint64_t time_;
uint64_t start_time_;
uint64_t end_time_;
std::map<std::string, uint64_t> stats_map_;
Status status_;
bool valid_;
DBImpl* db_impl_;
};
} // namespace ROCKSDB_NAMESPACE
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