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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 <memory>
#include "mongo/executor/task_executor.h"
#include "mongo/s/query/blocking_results_merger.h"
#include "mongo/s/query/cluster_client_cursor_params.h"
#include "mongo/s/query/router_exec_stage.h"
#include "mongo/s/transaction_router_resource_yielder.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
/**
* Serves as an adapter between the RouterExecStage interface and the BlockingResultsMerger
* interface, providing a single stream of results populated from many remote streams.
*/
class RouterStageMerge final : public RouterExecStage {
public:
RouterStageMerge(OperationContext* opCtx,
std::shared_ptr<executor::TaskExecutor> executor,
AsyncResultsMergerParams&& armParams)
: RouterExecStage(opCtx),
_resultsMerger(opCtx,
std::move(armParams),
std::move(executor),
TransactionRouterResourceYielder::makeForRemoteCommand()) {}
StatusWith<ClusterQueryResult> next() final {
return _resultsMerger.next(getOpCtx());
}
void kill(OperationContext* opCtx) final {
_resultsMerger.kill(opCtx);
}
bool remotesExhausted() final {
return _resultsMerger.remotesExhausted();
}
bool partialResultsReturned() const final {
return _resultsMerger.partialResultsReturned();
}
std::size_t getNumRemotes() const final {
return _resultsMerger.getNumRemotes();
}
BSONObj getPostBatchResumeToken() final {
return _resultsMerger.getHighWaterMark();
}
protected:
Status doSetAwaitDataTimeout(Milliseconds awaitDataTimeout) final {
return _resultsMerger.setAwaitDataTimeout(awaitDataTimeout);
}
void doReattachToOperationContext() override {
_resultsMerger.reattachToOperationContext(getOpCtx());
}
virtual void doDetachFromOperationContext() {
_resultsMerger.detachFromOperationContext();
}
private:
// Schedules remote work and merges results from 'remotes'.
BlockingResultsMerger _resultsMerger;
};
} // namespace mongo
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