b211bfa514
This, intended for tests, feature allows testing time related event without need for real time waits. Signed-off-by: Paweł Dziepak <pdziepak@cloudius-systems.com>
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#ifndef DB_CLOCK_HH_
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#define DB_CLOCK_HH_
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#include <chrono>
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#include <cstdint>
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#include "gc_clock.hh"
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// the database clock follows Java - 1ms granularity, 64-bit counter, 1970 epoch
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class db_clock {
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public:
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using base = std::chrono::system_clock;
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using rep = int64_t;
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using period = std::ratio<1, 1000>; // milliseconds
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<db_clock, duration>;
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static constexpr bool is_steady = base::is_steady;
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static std::time_t to_time_t(time_point t) {
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return std::chrono::duration_cast<std::chrono::seconds>(t.time_since_epoch()).count();
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}
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static time_point from_time_t(std::time_t t) {
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return time_point(std::chrono::duration_cast<duration>(std::chrono::seconds(t)));
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}
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static time_point now() {
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auto now_since_epoch = base::now() - base::from_time_t(0);
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return time_point(std::chrono::duration_cast<duration>(now_since_epoch)) + get_clocks_offset();
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}
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static uint64_t now_in_usecs() {
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return now().time_since_epoch().count() * 1000;
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}
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};
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static inline
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gc_clock::time_point to_gc_clock(db_clock::time_point tp) {
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static_assert(std::is_same<db_clock::base, gc_clock::base>::value, "Below we assume that base is the same");
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return gc_clock::time_point(std::chrono::duration_cast<gc_clock::duration>(tp.time_since_epoch()));
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}
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#endif /* DB_CLOCK_HH_ */
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