1 2 /** 3 * Copyright (C) 2018-present MongoDB, Inc. 4 * 5 * This program is free software: you can redistribute it and/or modify 6 * it under the terms of the Server Side Public License, version 1, 7 * as published by MongoDB, Inc. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * Server Side Public License for more details. 13 * 14 * You should have received a copy of the Server Side Public License 15 * along with this program. If not, see 16 * <http://www.mongodb.com/licensing/server-side-public-license>. 17 * 18 * As a special exception, the copyright holders give permission to link the 19 * code of portions of this program with the OpenSSL library under certain 20 * conditions as described in each individual source file and distribute 21 * linked combinations including the program with the OpenSSL library. You 22 * must comply with the Server Side Public License in all respects for 23 * all of the code used other than as permitted herein. If you modify file(s) 24 * with this exception, you may extend this exception to your version of the 25 * file(s), but you are not obligated to do so. If you do not wish to do so, 26 * delete this exception statement from your version. If you delete this 27 * exception statement from all source files in the program, then also delete 28 * it in the license file. 29 */ 30 31 #pragma once 32 33 #include <map> 34 #include <string> 35 36 #include "mongo/base/disallow_copying.h" 37 38 namespace mongo { 39 40 struct ChunkVersion; 41 class Client; 42 class ServiceContext; 43 44 /** 45 * There is one instance of these per each connection from mongos. Holds version state for each 46 * namespace. 47 */ 48 class ShardedConnectionInfo { 49 MONGO_DISALLOW_COPYING(ShardedConnectionInfo); 50 51 public: 52 ShardedConnectionInfo(); 53 ~ShardedConnectionInfo(); 54 55 static ShardedConnectionInfo* get(Client* client, bool create); 56 57 /** 58 * Returns the shard version associated with the specified namespace on this connection. If no 59 * version is associated with the namespace returns ChunkVersion::UNSHARDED. 60 */ 61 ChunkVersion getVersion(const std::string& ns) const; 62 63 /** 64 * Assigns a new version on the connection to the specified namespace. 65 */ 66 void setVersion(const std::string& ns, const ChunkVersion& version); 67 68 static void reset(Client* client); 69 static void addHook(ServiceContext* service); 70 71 private: 72 typedef std::map<std::string, ChunkVersion> NSVersionMap; 73 74 // Map from a namespace string to the chunk version with which this connection has been 75 // initialized for the specified namespace 76 NSVersionMap _versions; 77 78 // If this is true, then chunk versions aren't checked, and all operations are allowed 79 bool _forceVersionOk; 80 }; 81 82 83 } // namespace mongo 84