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/**
* Copyright (C) 2018-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/pipeline/document_source_out.h"
namespace mongo {
/**
* Version of $out which performs inserts directly to the output collection, failing if there's a
* duplicate key.
*/
class DocumentSourceOutInPlace : public DocumentSourceOut {
public:
using DocumentSourceOut::DocumentSourceOut;
const NamespaceString& getWriteNs() const final {
return _outputNs;
};
/**
* No initialization needed since writes will be directed straight to the output collection.
*/
void initializeWriteNs() final{};
void finalize() final{};
};
/**
* Version of $out which replaces the documents in the output collection that match the unique key,
* or inserts the document if there is no match.
*/
class DocumentSourceOutInPlaceReplace final : public DocumentSourceOutInPlace {
public:
using DocumentSourceOutInPlace::DocumentSourceOutInPlace;
void spill(BatchedObjects&& batch) final {
// Set upsert to true and multi to false as there should be at most one document to update
// or insert.
constexpr auto upsert = true;
constexpr auto multi = false;
try {
LocalReadConcernBlock readLocal(pExpCtx->opCtx);
pExpCtx->mongoProcessInterface->update(pExpCtx,
getWriteNs(),
std::move(batch.uniqueKeys),
std::move(batch.objects),
_writeConcern,
upsert,
multi,
_targetEpoch());
} catch (const ExceptionFor<ErrorCodes::ImmutableField>& ex) {
uassertStatusOKWithContext(ex.toStatus(),
"$out failed to update the matching document, did you "
"attempt to modify the _id or the shard key?");
}
}
};
} // namespace mongo
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