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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 <queue>
#include <utility>
#include <vector>
#include "mongo/platform/basic.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/clock_source_mock.h"
#include "mongo/util/static_immortal.h"
namespace mongo {
namespace {
/**
* This is a synchronized global mocked ClockSource.
*
* For ease of use, this is the underlying source behind *every* clock source.
**/
class ClockSourceMockImpl {
public:
Date_t now() const {
stdx::lock_guard lk(_mutex);
return _now;
}
void advance(Milliseconds ms) {
stdx::unique_lock lk(_mutex);
_now += ms;
_processAlarms(lk);
}
void reset(Date_t newNow) {
stdx::unique_lock lk(_mutex);
_now = newNow;
_processAlarms(lk);
}
void setAlarm(Date_t when, unique_function<void()> action) {
if (!action)
return;
stdx::unique_lock lk(_mutex);
_alarms.push({when, std::move(action)});
_processAlarms(lk);
}
private:
struct Alarm {
Date_t when;
unique_function<void()> action;
};
// By `when`, descending, to create a min-heap.
struct AlarmQueueOrder {
bool operator()(const Alarm& a, const Alarm& b) const {
return a.when > b.when;
}
};
class AlarmQueue : public std::priority_queue<Alarm, std::vector<Alarm>, AlarmQueueOrder> {
public:
unique_function<void()> consumeNextAction() {
invariant(!c.empty(), "Alarm queue cannot be empty");
// Ok because action doesn't affect heap order.
auto action = std::move(c.front().action);
pop();
return action;
}
};
void _processAlarms(stdx::unique_lock<stdx::mutex>& lk) {
while (!_alarms.empty() && _alarms.top().when <= _now) {
auto action = _alarms.consumeNextAction();
lk.unlock();
ScopeGuard relock([&] { lk.lock(); });
action();
}
}
mutable stdx::mutex _mutex; // NOLINT
Date_t _now = ClockSourceMock::kInitialNow;
AlarmQueue _alarms;
};
ClockSourceMockImpl* getGlobalClockSourceMock() {
static StaticImmortal<ClockSourceMockImpl> clkSource;
return &*clkSource;
}
} // namespace
Milliseconds ClockSourceMock::getPrecision() {
return Milliseconds(1);
}
Date_t ClockSourceMock::now() {
return getGlobalClockSourceMock()->now();
}
void ClockSourceMock::advance(Milliseconds ms) {
getGlobalClockSourceMock()->advance(ms);
}
void ClockSourceMock::reset(Date_t newNow) {
getGlobalClockSourceMock()->reset(newNow);
}
void ClockSourceMock::setAlarm(Date_t when, unique_function<void()> action) {
getGlobalClockSourceMock()->setAlarm(when, std::move(action));
}
} // namespace mongo
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