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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.
*/
#pragma once
#include <memory>
#include "mongo/util/clock_source.h"
#include "mongo/util/time_support.h"
namespace mongo {
/**
* Mock clock source that returns a fixed time until explicitly advanced.
*
* Each ClockSourceMock that is constructed tracks the same shared global understanding of time.
*/
class ClockSourceMock : public ClockSource {
public:
static constexpr auto kInitialNow = Date_t::fromMillisSinceEpoch(1);
/**
* Constructs a ClockSourceMock with the current time set to the Unix epoch.
*/
ClockSourceMock() {
_tracksSystemClock = false;
}
Milliseconds getPrecision() override;
Date_t now() override;
void setAlarm(Date_t when, unique_function<void()> action) override;
/**
* Advances the current time by the given value.
*/
void advance(Milliseconds ms);
/**
* Resets the current time to the given value.
*/
void reset(Date_t newNow = kInitialNow);
};
/**
* Mock clock source where reading the clock also advances the current time by a fixed interval.
*/
class AutoAdvancingClockSourceMock : public ClockSourceMock {
public:
AutoAdvancingClockSourceMock(Milliseconds increment) : _increment(increment) {}
Date_t now() override {
ClockSourceMock::advance(_increment);
return ClockSourceMock::now();
}
private:
const Milliseconds _increment;
};
class SharedClockSourceAdapter final : public ClockSource {
public:
explicit SharedClockSourceAdapter(std::shared_ptr<ClockSource> source)
: _source(std::move(source)) {
_tracksSystemClock = _source->tracksSystemClock();
}
Milliseconds getPrecision() override {
return _source->getPrecision();
}
Date_t now() override {
return _source->now();
}
void setAlarm(Date_t when, unique_function<void()> action) override {
_source->setAlarm(when, std::move(action));
}
private:
const std::shared_ptr<ClockSource> _source;
};
} // namespace mongo
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