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/**
* Copyright (C) 2018 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/document_source_plan_cache_stats.h"
namespace mongo {
const char* DocumentSourcePlanCacheStats::kStageName = "$planCacheStats";
REGISTER_DOCUMENT_SOURCE(planCacheStats,
DocumentSourcePlanCacheStats::LiteParsed::parse,
DocumentSourcePlanCacheStats::createFromBson);
boost::intrusive_ptr<DocumentSource> DocumentSourcePlanCacheStats::createFromBson(
BSONElement spec, const boost::intrusive_ptr<ExpressionContext>& pExpCtx) {
uassert(
ErrorCodes::FailedToParse,
str::stream() << kStageName << " value must be an object. Found: " << typeName(spec.type()),
spec.type() == BSONType::Object);
uassert(ErrorCodes::FailedToParse,
str::stream() << kStageName << " parameters object must be empty. Found: "
<< typeName(spec.type()),
spec.embeddedObject().isEmpty());
uassert(50932,
str::stream() << kStageName << " cannot be executed against a MongoS.",
!pExpCtx->inMongos && !pExpCtx->fromMongos && !pExpCtx->needsMerge);
return new DocumentSourcePlanCacheStats(pExpCtx);
}
DocumentSourcePlanCacheStats::DocumentSourcePlanCacheStats(
const boost::intrusive_ptr<ExpressionContext>& expCtx)
: DocumentSource(expCtx) {}
void DocumentSourcePlanCacheStats::serializeToArray(
std::vector<Value>& array, boost::optional<ExplainOptions::Verbosity> explain) const {
if (explain) {
array.push_back(Value{
Document{{kStageName,
Document{{"match"_sd,
_absorbedMatch ? Value{_absorbedMatch->getQuery()} : Value{}}}}}});
} else {
array.push_back(Value{Document{{kStageName, Document{}}}});
if (_absorbedMatch) {
_absorbedMatch->serializeToArray(array);
}
}
}
Pipeline::SourceContainer::iterator DocumentSourcePlanCacheStats::doOptimizeAt(
Pipeline::SourceContainer::iterator itr, Pipeline::SourceContainer* container) {
auto itrToNext = std::next(itr);
if (itrToNext == container->end()) {
return itrToNext;
}
auto subsequentMatch = dynamic_cast<DocumentSourceMatch*>(itrToNext->get());
if (!subsequentMatch) {
return itrToNext;
}
_absorbedMatch = subsequentMatch;
return container->erase(itrToNext);
}
DocumentSource::GetNextResult DocumentSourcePlanCacheStats::getNext() {
if (!_haveRetrievedStats) {
const auto matchExpr = _absorbedMatch ? _absorbedMatch->getMatchExpression() : nullptr;
_results = pExpCtx->mongoProcessInterface->getMatchingPlanCacheEntryStats(
pExpCtx->opCtx, pExpCtx->ns, matchExpr);
_resultsIter = _results.begin();
_haveRetrievedStats = true;
}
if (_resultsIter == _results.end()) {
return GetNextResult::makeEOF();
}
return Document{*_resultsIter++};
}
} // namespace mongo
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