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path: root/src/mongo/db/operation_time_tracker.cpp
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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.
 */

#include "mongo/platform/basic.h"

#include "mongo/db/operation_time_tracker.h"
#include "mongo/stdx/mutex.h"

namespace mongo {
namespace {
struct OperationTimeTrackerHolder {
    OperationTimeTrackerHolder() : opTimeTracker(std::make_shared<OperationTimeTracker>()) {}
    static const OperationContext::Decoration<OperationTimeTrackerHolder> get;
    std::shared_ptr<OperationTimeTracker> opTimeTracker;
};

const OperationContext::Decoration<OperationTimeTrackerHolder> OperationTimeTrackerHolder::get =
    OperationContext::declareDecoration<OperationTimeTrackerHolder>();
}

std::shared_ptr<OperationTimeTracker> OperationTimeTracker::get(OperationContext* opCtx) {
    auto timeTrackerHolder = OperationTimeTrackerHolder::get(opCtx);
    invariant(timeTrackerHolder.opTimeTracker);
    return timeTrackerHolder.opTimeTracker;
}

LogicalTime OperationTimeTracker::getMaxOperationTime() const {
    stdx::lock_guard<stdx::mutex> lock(_mutex);
    return _maxOperationTime;
}

void OperationTimeTracker::updateOperationTime(LogicalTime newTime) {
    stdx::lock_guard<stdx::mutex> lock(_mutex);
    if (newTime > _maxOperationTime) {
        _maxOperationTime = std::move(newTime);
    }
}

}  // namespace mongo