fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <chrono>
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#include <ostream>
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namespace raft {
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// Raft protocol state machine clock ticks at different speeds
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// depending on the environment. A typical clock tick for
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// a production system is 100ms, while a test system can
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// tick it at the speed of the hardware clock.
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//
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// Every state machine has an own instance of logical clock,
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// this enables tests when different state machines run at
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// different clock speeds.
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class logical_clock final {
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public:
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using rep = int64_t;
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// There is no realistic period for a logical clock,
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// just use the smallest period possible.
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using period = std::chrono::nanoseconds::period;
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<logical_clock, duration>;
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static constexpr bool is_steady = true;
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void advance(duration diff = duration{1}) {
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_now += diff;
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}
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time_point now() const noexcept {
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return _now;
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}
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static constexpr time_point min() {
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return time_point(duration{0});
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}
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private:
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time_point _now = min();
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};
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inline std::ostream& operator<<(std::ostream& os, const logical_clock::time_point& p) {
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return os << (p - logical_clock::min()).count();
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}
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} // end of namespace raft
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namespace std {
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inline std::ostream& operator<<(std::ostream& os, const raft::logical_clock::duration& d) {
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return os << d.count();
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}
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} // end of namespace std
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