1 /*
2  * Copyright (c) 2023 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 DIFFERENTIAL_STRATEGY_H
17 #define DIFFERENTIAL_STRATEGY_H
18 #include "cloud_sync_strategy.h"
19 
20 namespace DistributedDB {
21 class CloudMergeStrategy : public CloudSyncStrategy {
22 public:
23     CloudMergeStrategy() = default;
24     ~CloudMergeStrategy() override = default;
25 
26     OpType TagSyncDataStatus(bool existInLocal, bool isCloudWin, const LogInfo &localInfo,
27         const LogInfo &cloudInfo) override;
28 
29     bool JudgeUpdateCursor() override;
30 
31     bool JudgeUpload() override;
32 private:
33     OpType TagLocallyNewer(const LogInfo &localInfo, const LogInfo &cloudInfo, bool isCloudDelete, bool isLocalDelete);
34 
35     OpType TagCloudUpdateLocal(const LogInfo &localInfo, const LogInfo &cloudInfo, bool isCloudDelete,
36         bool isLocalDelete);
37 
38     OpType TagLocalNotExist(bool isCloudDelete);
39     bool JudgeLocallyNewer(const LogInfo &localInfo, const LogInfo &cloudInfo);
40 };
41 }
42 #endif // DIFFERENTIAL_STRATEGY_H
43