diff options
Diffstat (limited to 'src/mongo/db/query/stats/stats_cache.cpp')
-rw-r--r-- | src/mongo/db/query/stats/stats_cache.cpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/mongo/db/query/stats/stats_cache.cpp b/src/mongo/db/query/stats/stats_cache.cpp new file mode 100644 index 00000000000..dfe5a43890e --- /dev/null +++ b/src/mongo/db/query/stats/stats_cache.cpp @@ -0,0 +1,74 @@ +/** + * Copyright (C) 2022-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/db/query/stats/stats_cache.h" + +#include "mongo/db/query/stats/collection_statistics.h" +#include "mongo/util/read_through_cache.h" + +#include "mongo/logv2/log.h" + +#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery + +namespace mongo::stats { +namespace { +const auto statsCacheDecoration = ServiceContext::declareDecoration<std::unique_ptr<StatsCache>>(); +} // namespace + +StatsCache::StatsCache(ServiceContext* service, + std::unique_ptr<StatsCacheLoader> cacheLoader, + ThreadPoolInterface& threadPool, + int size) + : ReadThroughCache( + _mutex, + service, + threadPool, + [this](OperationContext* opCtx, + const StatsPathString& statsPath, + const ValueHandle& stats) { return _lookupStats(opCtx, statsPath, stats); }, + size), + _statsCacheLoader(std::move(cacheLoader)) {} + +StatsCache::LookupResult StatsCache::_lookupStats(OperationContext* opCtx, + const StatsPathString& statsPath, + const StatsCacheValueHandle& stats) { + + try { + invariant(_statsCacheLoader); + auto newStats = _statsCacheLoader->getStats(opCtx, statsPath).get(); + return LookupResult(std::move(newStats)); + } catch (const DBException& ex) { + if (ex.code() == ErrorCodes::NamespaceNotFound) { + return StatsCache::LookupResult(boost::none); + } + throw; + } +} + +} // namespace mongo::stats |