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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 "mongo/stdx/condition_variable.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/alarm.h"
#include "mongo/util/concurrency/with_lock.h"
#include "mongo/util/time_support.h"
namespace mongo {
/*
* This is a runner for alarm schedulers that waits for and processes alarms in a single
* background thread.
*/
class AlarmRunnerBackgroundThread {
public:
using AlarmSchedulerHandle = std::shared_ptr<AlarmScheduler>;
// Construct an alarm runner from a vector of shared_ptr<AlarmScheduler>'s.
explicit AlarmRunnerBackgroundThread(std::vector<AlarmSchedulerHandle> container)
: _schedulers(_initializeSchedulers(std::move(container))) {}
/*
* Starts a background thread that will process alarms from all registered schedulers.
*/
void start();
/*
* Clears all outstanding timers from all registered schedulers and shuts down the background
* thread.
*/
void shutdown();
private:
std::vector<AlarmSchedulerHandle> _initializeSchedulers(
std::vector<AlarmSchedulerHandle> container);
void _threadRoutine();
Mutex _mutex = MONGO_MAKE_LATCH("AlarmRunnerBackgroundThread::_mutex");
stdx::condition_variable _condVar;
bool _running = false;
Date_t _nextAlarm = Date_t::max();
std::vector<AlarmSchedulerHandle> _schedulers;
stdx::thread _thread;
};
} // namespace mongo
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