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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/s/query/router_exec_stage.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/pipeline.h"
#include "mongo/s/query/document_source_merge_cursors.h"
namespace mongo {
/**
* Inserts a pipeline into the router execution tree, drawing results from the input stage, feeding
* them through the pipeline, and outputting the results of the pipeline.
*/
class RouterStagePipeline final : public RouterExecStage {
public:
RouterStagePipeline(std::unique_ptr<Pipeline, PipelineDeleter> mergePipeline);
StatusWith<ClusterQueryResult> next() final;
void kill(OperationContext* opCtx) final;
bool remotesExhausted() final;
std::size_t getNumRemotes() const final;
BSONObj getPostBatchResumeToken() final;
protected:
Status doSetAwaitDataTimeout(Milliseconds awaitDataTimeout) final;
void doReattachToOperationContext() final;
void doDetachFromOperationContext() final;
private:
BSONObj _validateAndConvertToBSON(const Document& event);
std::unique_ptr<Pipeline, PipelineDeleter> _mergePipeline;
// May be null if this pipeline runs exclusively on mongos without contacting the shards at all.
boost::intrusive_ptr<DocumentSourceMergeCursors> _mergeCursorsStage;
};
} // namespace mongo
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