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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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(RouterExecStage::ExecContext execContext) final;
void kill(OperationContext* opCtx) final;
bool remotesExhausted() final;
std::size_t getNumRemotes() const final;
protected:
Status doSetAwaitDataTimeout(Milliseconds awaitDataTimeout) final;
void doReattachToOperationContext() final;
void doDetachFromOperationContext() final;
private:
std::unique_ptr<Pipeline, PipelineDeleter> _mergePipeline;
// May be null if this pipeline is executing exclusively on mongos and will not contact the
// shards at all.
boost::intrusive_ptr<DocumentSourceMergeCursors> _mergeCursorsStage;
};
} // namespace mongo
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