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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.
*/
#pragma once
#include "mongo/base/status.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/query/partitioned_cache.h"
#include "mongo/db/query/util/memory_util.h"
namespace mongo::query_stats_util {
Status onQueryStatsStoreSizeUpdate(const std::string& str);
Status validateQueryStatsStoreSize(const std::string& str, const boost::optional<TenantId>&);
Status onQueryStatsSamplingRateUpdate(int samplingRate);
/**
* An interface used to modify the queryStats store when query setParameters are modified. This is
* done via an interface decorating the 'ServiceContext' in order to avoid a link-time dependency
* of the query knobs library on the queryStats code.
*/
class OnParamChangeUpdater {
public:
virtual ~OnParamChangeUpdater() = default;
/**
* Resizes the queryStats store decorating 'serviceCtx' to the new size given by 'memSize'. If
* the new size is smaller than the old, cache entries are evicted in order to ensure the
* cache fits within the new size bound.
*/
virtual void updateCacheSize(ServiceContext* serviceCtx, memory_util::MemorySize memSize) = 0;
/**
* Updates the sampling rate for the queryStats rate limiter.
*/
virtual void updateSamplingRate(ServiceContext* serviceCtx, int samplingRate) = 0;
};
/**
* A stub implementation that does not allow changing any parameters - to be used if the queryStats
* store is disabled and cannot be re-enabled without restarting, as with a feature flag.
*/
class NoChangesAllowedTelemetryParamUpdater : public OnParamChangeUpdater {
public:
void updateCacheSize(ServiceContext* serviceCtx, memory_util::MemorySize memSize) final {
uasserted(7373500,
"Cannot configure queryStats store - it is currently disabled and a restart is "
"required to activate.");
}
void updateSamplingRate(ServiceContext* serviceCtx, int samplingRate) {
uasserted(7506200,
"Cannot configure queryStats store - it is currently disabled and a restart is "
"required to activate.");
}
};
/**
* Decorated accessor to the 'OnParamChangeUpdater' stored in 'ServiceContext'.
*/
extern const Decorable<ServiceContext>::Decoration<std::unique_ptr<OnParamChangeUpdater>>
queryStatsStoreOnParamChangeUpdater;
} // namespace mongo::query_stats_util
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