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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.
*/
#include "mongo/db/storage/external_record_store.h"
#include "mongo/db/storage/multi_bson_stream_cursor.h"
#include "mongo/db/storage/record_store.h"
namespace mongo {
// 'ident' is an identifer to WT table and a virtual collection does not have any persistent data
// in WT. So, we set the "dummy" ident for a virtual collection.
ExternalRecordStore::ExternalRecordStore(StringData ns, const VirtualCollectionOptions& vopts)
: RecordStore(ns, /*identName=*/"dummy"_sd, /*isCapped=*/false), _vopts(vopts) {}
/**
* Returns a MultiBsonStreamCursor for this record store. Reverse scans are not currently supported
* for this record store type, so if 'forward' is false this asserts.
*/
std::unique_ptr<SeekableRecordCursor> ExternalRecordStore::getCursor(OperationContext* opCtx,
bool forward) const {
if (forward) {
return std::make_unique<MultiBsonStreamCursor>(getOptions());
}
tasserted(6968302, "MultiBsonStreamCursor does not support reverse scans");
return nullptr;
}
} // namespace mongo
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