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/**
* 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/platform/basic.h"
#include "mongo/db/query/ce/stats_cache.h"
#include "mongo/db/query/ce/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 {
using namespace mongo::ce;
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
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