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/**
* Copyright (C) 2017 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kControl
#include "mongo/platform/basic.h"
#include <memory>
#include "mongo/util/periodic_runner_asio.h"
#include "mongo/util/log.h"
namespace mongo {
PeriodicRunnerASIO::PeriodicRunnerASIO(
std::unique_ptr<executor::AsyncTimerFactoryInterface> timerFactory)
: _io_service(),
_strand(_io_service),
_timerFactory(std::move(timerFactory)),
_state(State::kReady) {}
PeriodicRunnerASIO::~PeriodicRunnerASIO() {
// We must call shutdown here to join our background thread.
shutdown();
}
void PeriodicRunnerASIO::scheduleJob(PeriodicJob job) {
// The interval we use here will get written over by _scheduleJob_inlock.
auto uniqueTimer = _timerFactory->make(&_strand, Milliseconds{0});
std::shared_ptr<executor::AsyncTimerInterface> timer{std::move(uniqueTimer)};
auto asioJob = std::make_shared<PeriodicJobASIO>(std::move(job), _timerFactory->now(), timer);
_jobs.insert(_jobs.end(), asioJob);
{
stdx::unique_lock<stdx::mutex> lk(_stateMutex);
if (_state == State::kRunning) {
_scheduleJob(asioJob);
}
}
}
void PeriodicRunnerASIO::_scheduleJob(std::weak_ptr<PeriodicJobASIO> job) {
auto lockedJob = job.lock();
if (!lockedJob) {
return;
}
// Adjust the timer to expire at the correct time.
auto adjustedMS = lockedJob->start + lockedJob->interval - _timerFactory->now();
lockedJob->timer->expireAfter(adjustedMS);
lockedJob->timer->asyncWait([this, job](std::error_code ec) mutable {
if (ec) {
severe() << "Encountered an error in PeriodicRunnerASIO: " << ec.message();
return;
}
stdx::unique_lock<stdx::mutex> lk(_stateMutex);
if (_state != State::kRunning) {
return;
}
auto lockedJob = job.lock();
if (!lockedJob) {
return;
}
lockedJob->start = _timerFactory->now();
lockedJob->job();
_io_service.post([this, job]() mutable { _scheduleJob(job); });
});
}
Status PeriodicRunnerASIO::startup() {
stdx::unique_lock<stdx::mutex> lk(_stateMutex);
if (_state != State::kReady) {
return {ErrorCodes::ShutdownInProgress, "startup() already called"};
}
_state = State::kRunning;
_thread = stdx::thread([this]() {
try {
asio::io_service::work workItem(_io_service);
std::error_code ec;
_io_service.run(ec);
if (ec) {
severe() << "Failure in PeriodicRunnerASIO: " << ec.message();
fassertFailed(40438);
}
} catch (...) {
severe() << "Uncaught exception in PeriodicRunnerASIO: " << exceptionToStatus();
fassertFailed(40439);
}
});
// schedule any jobs that we have
for (auto& job : _jobs) {
job->start = _timerFactory->now();
_scheduleJob(job);
}
return Status::OK();
}
void PeriodicRunnerASIO::shutdown() {
stdx::unique_lock<stdx::mutex> lk(_stateMutex);
if (_state == State::kRunning) {
_state = State::kComplete;
_io_service.stop();
_jobs.clear();
_thread.join();
}
}
} // namespace mongo
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