60 lines
1.9 KiB
C++
60 lines
1.9 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 <cstdint>
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#include <limits>
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#include <chrono>
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#include "clocks-impl.hh"
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namespace api {
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using timestamp_type = int64_t;
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timestamp_type constexpr missing_timestamp = std::numeric_limits<timestamp_type>::min();
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timestamp_type constexpr min_timestamp = std::numeric_limits<timestamp_type>::min() + 1;
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timestamp_type constexpr max_timestamp = std::numeric_limits<timestamp_type>::max();
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// Used for generating server-side mutation timestamps.
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// Same epoch as Java's System.currentTimeMillis() for compatibility.
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// Satisfies requirements of Clock.
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class timestamp_clock final {
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using base = std::chrono::system_clock;
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public:
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using rep = timestamp_type;
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using duration = std::chrono::microseconds;
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using period = typename duration::period;
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using time_point = std::chrono::time_point<timestamp_clock, duration>;
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static constexpr bool is_steady = base::is_steady;
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static time_point now() {
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return time_point(std::chrono::duration_cast<duration>(base::now().time_since_epoch())) + get_clocks_offset();
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}
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};
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static inline
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timestamp_type new_timestamp() {
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return timestamp_clock::now().time_since_epoch().count();
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}
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}
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