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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 <boost/optional.hpp>
#include <map>
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/s/chunk_version.h"
namespace mongo {
class Client;
/**
* There is one instance of these per each connection from mongos. Holds version state for each
* namespace.
*/
class ShardedConnectionInfo {
MONGO_DISALLOW_COPYING(ShardedConnectionInfo);
public:
ShardedConnectionInfo();
~ShardedConnectionInfo();
static ShardedConnectionInfo* get(Client* client, bool create);
static void reset(Client* client);
/**
* Returns the shard version associated with the specified namespace on this connection. If no
* version is associated with the namespace returns boost::none.
*/
boost::optional<ChunkVersion> getVersion(const std::string& ns) const;
/**
* Assigns a new version on the connection to the specified namespace.
*/
void setVersion(const std::string& ns, const ChunkVersion& version);
private:
typedef std::map<std::string, ChunkVersion> NSVersionMap;
// Map from a namespace string to the chunk version with which this connection has been
// initialized for the specified namespace
NSVersionMap _versions;
};
} // namespace mongo
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