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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"
namespace mongo {
/**
* A class that acts as an adapter between the RouterExecStage and DocumentSource interfaces,
* translating results from an input RouterExecStage into DocumentSource::GetNextResults.
*/
class DocumentSourceRouterAdapter final : public DocumentSource {
public:
static boost::intrusive_ptr<DocumentSourceRouterAdapter> create(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
std::unique_ptr<RouterExecStage> childStage);
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
return {StreamType::kStreaming,
PositionRequirement::kFirst,
HostTypeRequirement::kMongoS,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kNotAllowed,
TransactionRequirement::kAllowed};
}
GetNextResult getNext() final;
void doDispose() final;
void reattachToOperationContext(OperationContext* opCtx) final;
void detachFromOperationContext() final;
Value serialize(boost::optional<ExplainOptions::Verbosity> explain) const final;
bool remotesExhausted();
void setExecContext(RouterExecStage::ExecContext execContext) {
_execContext = execContext;
}
Status setAwaitDataTimeout(Milliseconds awaitDataTimeout) const {
return _child->setAwaitDataTimeout(awaitDataTimeout);
}
private:
DocumentSourceRouterAdapter(const boost::intrusive_ptr<ExpressionContext>& expCtx,
std::unique_ptr<RouterExecStage> childStage);
std::unique_ptr<RouterExecStage> _child;
RouterExecStage::ExecContext _execContext;
};
} // namespace mongo
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