1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef I_KV_DB_RESULT_SET_H 17 #define I_KV_DB_RESULT_SET_H 18 19 #include "macro_utils.h" 20 #include "db_types.h" 21 22 namespace DistributedDB { 23 class IKvDBResultSet { 24 public: 25 IKvDBResultSet() = default; ~IKvDBResultSet()26 virtual ~IKvDBResultSet() {} 27 28 DISABLE_COPY_ASSIGN_MOVE(IKvDBResultSet); 29 30 // Initialize logic 31 virtual int Open(bool isMemDb) = 0; 32 33 // Get total entries count. 34 // >= 0: count, < 0: errCode. 35 virtual int GetCount() const = 0; 36 37 // Get current read position. 38 // >= 0: position, < 0: errCode 39 virtual int GetPosition() const = 0; 40 41 // Move the read position to an absolute position value. 42 virtual int MoveTo(int position) const = 0; 43 44 // Get the entry of current position. 45 virtual int GetEntry(Entry &entry) const = 0; 46 47 // Finalize logic 48 virtual void Close() = 0; 49 }; 50 } // namespace DistributedDB 51 52 #endif // I_KV_DB_RESULT_SET_H 53