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/**
* Copyright (C) 2022-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 <vector>
#include "mongo/bson/timestamp.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/derived_metadata_common.h"
#include "mongo/util/assert_util.h"
namespace mongo {
/**
* Interface to access each DerivedMetadataType. Calculates metadata deltas from writes and
* maintains the latest metadata value.
*/
class DerivedMetadataType {
public:
DerivedMetadataType() {}
virtual ~DerivedMetadataType() = default;
virtual std::pair<Timestamp, long long> getLatestValue() = 0;
/*
* Applies given Deltas to the latest value. Only applies Deltas with Timestamps greater than
* the latest Timestamp.
*/
virtual void applyDeltas(const std::vector<DerivedMetadataDelta>& deltas) = 0;
/*
* Processes the Write for information relevant to this type and populates the Delta with the
* corresponding value change.
*/
static void populateDelta(const DocumentWriteImages& write, DerivedMetadataDelta* delta) {
// Note: derived classes must override this function with their own implementation.
MONGO_UNREACHABLE;
};
};
} // namespace mongo
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