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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/db/query/cost_model/cost_model_on_update.h"
#include "mongo/bson/json.h"
#include "mongo/db/client.h"
#include "mongo/db/query/cost_model/cost_model_manager.h"
#include "mongo/db/query/query_knobs_gen.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
namespace mongo::cost_model {
namespace {
BSONObj getCostModelCoefficientsOverride() {
if (internalCostModelCoefficients.empty()) {
return BSONObj();
}
return fromjson(internalCostModelCoefficients);
}
} // namespace
Status updateCostCoefficients() {
if (auto client = Client::getCurrent()) {
auto serviceCtx = client->getServiceContext();
tassert(7049000, "ServiceContext must be non null", serviceCtx);
const auto overrides = getCostModelCoefficientsOverride();
auto updater = onCoefficientsChangeUpdater(serviceCtx).get();
updater->updateCoefficients(serviceCtx, overrides);
} else {
// 'client' may be null if the server parameter is set on mongod startup.
LOGV2_DEBUG(7049001, 5, "Cost model coefficients updated on startup");
}
return Status::OK();
}
const Decorable<ServiceContext>::Decoration<std::unique_ptr<OnCoefficientsChangeUpdater>>
onCoefficientsChangeUpdater =
ServiceContext::declareDecoration<std::unique_ptr<OnCoefficientsChangeUpdater>>();
} // namespace mongo::cost_model
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