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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/db/operation_context.h"
#include "mongo/db/service_context.h"
namespace mongo {
/**
* Runs a background job on mongos only that periodically refreshes its in-memory cache of cluster
* server parameters with updated values from the config servers.
*/
class ClusterServerParameterRefresher {
public:
ClusterServerParameterRefresher() = default;
static ClusterServerParameterRefresher* get(OperationContext* opCtx);
static ClusterServerParameterRefresher* get(ServiceContext* serviceCtx);
/**
* Create a new ClusterServerParameterRefresher as a decorator on the service context
* and start the background job.
*/
static void start(ServiceContext* serviceCtx, OperationContext* opCtx);
/**
* Refreshes all cluster server parameters that have been updated on the config servers since
* _latestClusterParameterTime. Called periodically in the run method, which executes in a
* background thread. Also called in-line during getClusterParameter on mongos to ensure that
* cached values returned are up-to-date.
*/
Status refreshParameters(OperationContext* opCtx);
/**
* Set the period of the background job. This should only be used internally (by the
* setParameter).
*/
void setPeriod(Milliseconds period);
private:
void run();
std::unique_ptr<PeriodicJobAnchor> _job;
LogicalTime _latestClusterParameterTime = LogicalTime::kUninitialized;
};
Status clusterServerParameterRefreshIntervalSecsNotify(const int& newValue);
} // namespace mongo
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