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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/s/query/router_stage_pipeline.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/document_source_change_stream.h"
#include "mongo/db/pipeline/document_source_list_local_sessions.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/s/query/document_source_merge_cursors.h"
namespace mongo {
RouterStagePipeline::RouterStagePipeline(std::unique_ptr<Pipeline, PipelineDeleter> mergePipeline)
: RouterExecStage(mergePipeline->getContext()->opCtx),
_mergePipeline(std::move(mergePipeline)) {
invariant(!_mergePipeline->getSources().empty());
_mergeCursorsStage =
dynamic_cast<DocumentSourceMergeCursors*>(_mergePipeline->getSources().front().get());
}
StatusWith<ClusterQueryResult> RouterStagePipeline::next(RouterExecStage::ExecContext execContext) {
if (_mergeCursorsStage) {
_mergeCursorsStage->setExecContext(execContext);
}
// Pipeline::getNext will return a boost::optional<Document> or boost::none if EOF.
if (auto result = _mergePipeline->getNext()) {
return {result->toBson()};
}
// If we reach this point, we have hit EOF.
if (!_mergePipeline->getContext()->isTailableAwaitData()) {
_mergePipeline.get_deleter().dismissDisposal();
_mergePipeline->dispose(getOpCtx());
}
return {ClusterQueryResult()};
}
void RouterStagePipeline::doReattachToOperationContext() {
_mergePipeline->reattachToOperationContext(getOpCtx());
}
void RouterStagePipeline::doDetachFromOperationContext() {
_mergePipeline->detachFromOperationContext();
}
void RouterStagePipeline::kill(OperationContext* opCtx) {
_mergePipeline.get_deleter().dismissDisposal();
_mergePipeline->dispose(opCtx);
}
std::size_t RouterStagePipeline::getNumRemotes() const {
if (_mergeCursorsStage) {
return _mergeCursorsStage->getNumRemotes();
}
return 0;
}
bool RouterStagePipeline::remotesExhausted() {
return !_mergeCursorsStage || _mergeCursorsStage->remotesExhausted();
}
Status RouterStagePipeline::doSetAwaitDataTimeout(Milliseconds awaitDataTimeout) {
invariant(_mergeCursorsStage,
"The only cursors which should be tailable are those with remote cursors.");
return _mergeCursorsStage->setAwaitDataTimeout(awaitDataTimeout);
}
} // namespace mongo
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