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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/unittest/assert_that.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/duration.h"
#include "mongo/util/system_tick_source.h"
#include "mongo/util/tick_source.h"
#include "mongo/util/tick_source_mock.h"
#include "mongo/util/time_support.h"
namespace mongo {
namespace {
namespace m = unittest::match;
template <typename SourceDuration, typename OutDuration>
auto tickToDuration(int ticks) {
TickSourceMock<SourceDuration> ts;
ts.reset(ticks);
return ts.template ticksTo<OutDuration>(ts.getTicks()).count();
}
TEST(TickSourceTest, TicksToDurationConversion) {
ASSERT_EQ((tickToDuration<Seconds, Seconds>(1)), 1);
ASSERT_EQ((tickToDuration<Seconds, Milliseconds>(1)), 1'000);
ASSERT_EQ((tickToDuration<Seconds, Microseconds>(1)), 1'000'000);
ASSERT_EQ((tickToDuration<Milliseconds, Milliseconds>(1)), 1);
ASSERT_EQ((tickToDuration<Milliseconds, Microseconds>(1)), 1'000);
ASSERT_EQ((tickToDuration<Microseconds, Microseconds>(1)), 1);
}
TEST(SystemTickSourceTest, TicksPerSecond) {
ASSERT_EQ(makeSystemTickSource()->getTicksPerSecond(), 1'000'000'000);
}
TEST(SystemTickSourceTest, GetTicks) {
auto ts = makeSystemTickSource();
auto t0 = ts->getTicks();
for (int reps = 20; reps--;) {
static constexpr Milliseconds delay{200};
static constexpr Milliseconds err{20};
sleepFor(delay);
auto t1 = ts->getTicks();
ASSERT_THAT(ts->ticksTo<Milliseconds>(t1 - t0),
m::AllOf(m::Ge(delay - err), m::Le(delay + err)));
t0 = t1;
}
}
TEST(SystemTickSourceTest, Monotonic) {
auto ts = makeSystemTickSource();
auto t0 = ts->getTicks();
std::vector<TickSource::Tick> samples;
samples.reserve(1'000'000);
do {
samples.clear();
for (size_t i = 0; i < 1'000'000; ++i)
samples.push_back(ts->getTicks());
ASSERT_TRUE(std::is_sorted(samples.begin(), samples.end()));
} while (ts->ticksTo<Milliseconds>(ts->getTicks() - t0) < Seconds{5});
}
} // namespace
} // namespace mongo
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