38a54df863
People keep tripping over the old copyrights and copy-pasting them to new files. Search and replace "Cloudius Systems" with "ScyllaDB". Message-Id: <1460013664-25966-1-git-send-email-penberg@scylladb.com>
78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
/*
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <chrono>
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/**
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* A helper class to keep track of latencies
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*/
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namespace utils {
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class latency_counter {
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public:
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using clock = std::chrono::steady_clock;
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using time_point = clock::time_point;
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using duration = clock::duration;
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private:
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time_point _start;
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time_point _stop;
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public:
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void start() {
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_start = now();
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}
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bool is_start() const {
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// if start is not set it is still zero
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return _start.time_since_epoch().count();
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}
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latency_counter& stop() {
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_stop = now();
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return *this;
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}
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bool is_stopped() const {
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// if stop was not set, it is still zero
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return _stop.time_since_epoch().count();
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}
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duration latency() const {
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return _stop - _start;
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}
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latency_counter& check_and_stop() {
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if (!is_stopped()) {
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return stop();
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}
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return *this;
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}
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int64_t latency_in_nano() const {
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return std::chrono::duration_cast<std::chrono::nanoseconds>(latency()).count();
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}
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static time_point now() {
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return clock::now();
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}
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};
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}
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