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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/sequential_document_cache.h"
#include "mongo/base/error_codes.h"
#include "mongo/base/status.h"
namespace mongo {
void SequentialDocumentCache::add(Document doc) {
invariant(_status == CacheStatus::kBuilding);
if (checkCacheSize(doc) != CacheStatus::kAbandoned) {
_sizeBytes += doc.getApproximateSize();
_cache.push_back(std::move(doc));
}
}
void SequentialDocumentCache::freeze() {
invariant(_status == CacheStatus::kBuilding);
_status = CacheStatus::kServing;
_cache.shrink_to_fit();
_cacheIter = _cache.begin();
}
void SequentialDocumentCache::abandon() {
_status = CacheStatus::kAbandoned;
_cache.clear();
_cache.shrink_to_fit();
_cacheIter = _cache.begin();
}
boost::optional<Document> SequentialDocumentCache::getNext() {
invariant(_status == CacheStatus::kServing);
if (_cacheIter == _cache.end()) {
return boost::none;
}
return *_cacheIter++;
}
void SequentialDocumentCache::restartIteration() {
invariant(_status == CacheStatus::kServing);
_cacheIter = _cache.begin();
}
SequentialDocumentCache::CacheStatus SequentialDocumentCache::checkCacheSize(const Document& doc) {
if (_sizeBytes + doc.getApproximateSize() > _maxSizeBytes) {
abandon();
}
return _status;
}
} // namespace mongo
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