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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).
//
#pragma once
#include "monitoring/perf_level_imp.h"
#include "rocksdb/env.h"
#include "util/stop_watch.h"
namespace rocksdb {
class PerfStepTimer {
public:
explicit PerfStepTimer(uint64_t* metric, bool for_mutex = false,
Statistics* statistics = nullptr,
uint32_t ticker_type = 0)
: perf_counter_enabled_(
perf_level >= PerfLevel::kEnableTime ||
(!for_mutex && perf_level >= kEnableTimeExceptForMutex)),
env_((perf_counter_enabled_ || statistics != nullptr) ? Env::Default()
: nullptr),
start_(0),
metric_(metric),
statistics_(statistics),
ticker_type_(ticker_type) {}
~PerfStepTimer() {
Stop();
}
void Start() {
if (perf_counter_enabled_ || statistics_ != nullptr) {
start_ = env_->NowNanos();
}
}
void Measure() {
if (start_) {
uint64_t now = env_->NowNanos();
*metric_ += now - start_;
start_ = now;
}
}
void Stop() {
if (start_) {
uint64_t duration = env_->NowNanos() - start_;
if (perf_counter_enabled_) {
*metric_ += duration;
}
if (statistics_ != nullptr) {
RecordTick(statistics_, ticker_type_, duration);
}
start_ = 0;
}
}
private:
const bool perf_counter_enabled_;
Env* const env_;
uint64_t start_;
uint64_t* metric_;
Statistics* statistics_;
uint32_t ticker_type_;
};
} // namespace rocksdb
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