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/**
* Copyright (C) 2023-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/storage/collection_truncate_markers.h"
/**
* Implementation of truncate markers for Change Collections. Respects the requirement of always
* maintaining at least 1 entry in the change collection.
*/
namespace mongo {
class ChangeCollectionTruncateMarkers final
: public CollectionTruncateMarkersWithPartialExpiration {
public:
ChangeCollectionTruncateMarkers(TenantId tenantId,
std::deque<Marker> markers,
int64_t leftoverRecordsCount,
int64_t leftoverRecordsBytes,
int64_t minBytesPerMarker);
// Expires the partial marker with proper care for the last entry. Expiring here means:
// * Turning the partial marker into an actual marker
// * Ensuring the last entry isn't present in the generated marker
// The last entry is necessary for correctness of the change collection. This method will shift
// the last entry size and count to the next partial marker.
void expirePartialMarker(OperationContext* opCtx, const Collection* changeCollection);
private:
bool _hasExcessMarkers(OperationContext* opCtx) const override;
bool _hasPartialMarkerExpired(OperationContext* opCtx) const override;
TenantId _tenantId;
};
} // namespace mongo
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