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/**
* Copyright (C) 2020-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/vector_clock.h"
namespace mongo {
/**
* A vector clock service that additionally permits being advanced authoritatively ("ticking").
*
* Only linked in contexts where ticking is allowed, ie. mongod, embedded, mongod-based unittests.
*/
class VectorClockMutable : public VectorClock {
public:
// Decorate ServiceContext with VectorClockMutable*, that will resolve to the mutable vector
// clock implementation.
static VectorClockMutable* get(ServiceContext* service);
static VectorClockMutable* get(OperationContext* ctx);
static void registerVectorClockOnServiceContext(ServiceContext* service,
VectorClockMutable* vectorClockMutable);
// Ticking
virtual LogicalTime tick(Component component, uint64_t nTicks) = 0;
virtual void tickTo(Component component, LogicalTime newTime) = 0;
protected:
static bool _lessThanOrEqualToMaxPossibleTime(LogicalTime time, uint64_t nTicks);
VectorClockMutable();
virtual ~VectorClockMutable();
// Internal Ticking API
LogicalTime _advanceComponentTimeByTicks(Component component, uint64_t nTicks);
void _advanceComponentTimeTo(Component component, LogicalTime&& newTime);
};
} // namespace mongo
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