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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/db/logical_time.h"
#include "mongo/db/operation_context.h"
#include "mongo/platform/mutex.h"
namespace mongo {
/**
* OperationTimeTracker holds the latest operationTime received from a mongod for the current
* operation. Mongos commands are processed via ASIO, meaning a random thread will handle the
* response, so this class is declared as a decoration on OperationContext.
*/
class OperationTimeTracker {
public:
// Decorate OperationContext with OperationTimeTracker instance.
static std::shared_ptr<OperationTimeTracker> get(OperationContext* ctx);
/*
* Return the latest operationTime.
*/
LogicalTime getMaxOperationTime() const;
/*
* Update _maxOperationTime to max(newTime, _maxOperationTime)
*/
void updateOperationTime(LogicalTime newTime);
private:
// protects _maxOperationTime
mutable Mutex _mutex = MONGO_MAKE_LATCH("OperationTimeTracker::_mutex");
LogicalTime _maxOperationTime;
};
} // namespace mongo
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