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/**
* Copyright (C) 2018-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/platform/mutex.h"
#include "mongo/s/sessions_collection_sharded.h"
namespace mongo {
class OperationContext;
/**
* Accesses the sessions collection for config servers.
*/
class SessionsCollectionConfigServer : public SessionsCollectionSharded {
public:
/**
* Ensures that the sessions collection has been set up for this cluster, sharded, and with the
* proper indexes.
*
* This method may safely be called multiple times and if called concurrently the calls will get
* serialised using the mutex below.
*
* If there are no shards in this cluster, this method will do nothing.
*/
void setupSessionsCollection(OperationContext* opCtx) override;
private:
void _shardCollectionIfNeeded(OperationContext* opCtx);
void _generateIndexesIfNeeded(OperationContext* opCtx);
// Serialises concurrent calls to setupSessionsCollection so that only one thread performs the
// sharded operations
Mutex _mutex = MONGO_MAKE_LATCH("SessionsCollectionConfigServer::_mutex");
};
} // namespace mongo
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