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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 <vector>
#include "mongo/db/service_context_fwd.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/clock_source.h"
#include "mongo/util/concurrency/with_lock.h"
#include "mongo/util/periodic_runner.h"
namespace mongo {
/**
* An implementation of the PeriodicRunner which exposes a pump function to execute jobs on the
* calling thread.
*/
class PeriodicRunnerEmbedded : public PeriodicRunner {
public:
PeriodicRunnerEmbedded(ServiceContext* svc, ClockSource* clockSource);
~PeriodicRunnerEmbedded();
std::unique_ptr<PeriodicRunner::PeriodicJobHandle> makeJob(PeriodicJob job) override;
void scheduleJob(PeriodicJob job) override;
void startup() override;
void shutdown() override;
// Safe to call from multiple threads but will only execute on one thread at a time.
// Returns true if it attempted to run any jobs.
bool tryPump();
private:
class PeriodicJobImpl {
MONGO_DISALLOW_COPYING(PeriodicJobImpl);
public:
friend class PeriodicRunnerEmbedded;
PeriodicJobImpl(PeriodicJob job, ClockSource* source, PeriodicRunnerEmbedded* runner);
void start();
void pause();
void resume();
void stop();
bool isAlive(WithLock lk);
Date_t nextScheduledRun() const {
return _lastRun + _job.interval;
}
enum class ExecutionStatus { kNotScheduled, kRunning, kPaused, kCanceled };
private:
PeriodicJob _job;
ClockSource* _clockSource;
PeriodicRunnerEmbedded* _periodicRunner;
Date_t _lastRun{};
// The mutex is protecting _execStatus, the variable that can be accessed from other
// threads.
stdx::mutex _mutex;
// The current execution status of the job.
ExecutionStatus _execStatus{ExecutionStatus::kNotScheduled};
};
struct PeriodicJobSorter;
std::shared_ptr<PeriodicRunnerEmbedded::PeriodicJobImpl> createAndAddJob(PeriodicJob job,
bool shouldStart);
class PeriodicJobHandleImpl : public PeriodicJobHandle {
public:
explicit PeriodicJobHandleImpl(std::weak_ptr<PeriodicJobImpl> jobImpl)
: _jobWeak(jobImpl) {}
void start() override;
void stop() override;
void pause() override;
void resume() override;
private:
std::weak_ptr<PeriodicJobImpl> _jobWeak;
};
ServiceContext* _svc;
ClockSource* _clockSource;
// min-heap for running jobs, next job to run in front()
std::vector<std::shared_ptr<PeriodicJobImpl>> _jobs;
std::vector<std::shared_ptr<PeriodicJobImpl>> _Pausedjobs;
stdx::mutex _mutex;
bool _running = false;
};
} // namespace mongo
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