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/**
* Copyright (C) 2019-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/exec/update_stage.h"
namespace mongo {
/**
* Execution stage for update requests with {upsert:true}. This is a specialized UpdateStage which,
* in the event that no documents match the update request's query, generates and inserts a new
* document into the collection. All logic related to the insertion phase is implemented by this
* class.
*
* If the prior or newly-updated version of the document was requested to be returned, then ADVANCED
* is returned after updating or inserting a document. Otherwise, NEED_TIME is returned after
* updating a document if further updates are pending, and IS_EOF is returned if all updates have
* been performed or if a document has been inserted.
*
* Callers of doWork() must be holding a write lock.
*/
class UpsertStage final : public UpdateStage {
UpsertStage(const UpsertStage&) = delete;
UpsertStage& operator=(const UpsertStage&) = delete;
public:
UpsertStage(ExpressionContext* expCtx,
const UpdateStageParams& params,
WorkingSet* ws,
const CollectionPtr& collection,
PlanStage* child);
bool isEOF() final;
StageState doWork(WorkingSetID* out) final;
private:
BSONObj _produceNewDocumentForInsert();
void _performInsert(BSONObj newDocument);
void _generateNewDocumentFromSuppliedDoc(const FieldRefSet& immutablePaths);
void _generateNewDocumentFromUpdateOp(const FieldRefSet& immutablePaths);
void _assertDocumentToBeInsertedIsValid(const mutablebson::Document& document,
const FieldRefSet& shardKeyPaths);
};
} // namespace mongo
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