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 #ifndef RELATIONAL_STORE_INSTANCE_H
16 #define RELATIONAL_STORE_INSTANCE_H
17 #ifdef RELATIONAL_STORE
18 
19 #include <string>
20 #include <mutex>
21 
22 #include "irelational_store.h"
23 #include "relationaldb_properties.h"
24 
25 namespace DistributedDB {
26 class RelationalStoreInstance final {
27 public:
28     RelationalStoreInstance();
29     ~RelationalStoreInstance() = default;
30 
31     static RelationalStoreConnection *GetDatabaseConnection(const RelationalDBProperties &properties, int &errCode,
32         bool isNeedIfOpened = true);
33     static RelationalStoreInstance *GetInstance();
34 
35     static int ReleaseDataBaseConnection(RelationalStoreConnection *connection);
36 
37     // public for test mock
38     static IRelationalStore *GetDataBase(const RelationalDBProperties &properties, int &errCode,
39         bool isNeedIfOpened = true);
40 
41     void Dump(int fd);
42 private:
43 
44     IRelationalStore *OpenDatabase(const RelationalDBProperties &properties, int &errCode);
45 
46     void RemoveKvDBFromCache(const RelationalDBProperties &properties);
47     void SaveRelationalDBToCache(IRelationalStore *store, const RelationalDBProperties &properties);
48 
49     void EnterDBOpenCloseProcess(const std::string &identifier);
50     void ExitDBOpenCloseProcess(const std::string &identifier);
51 
52     static RelationalStoreInstance *instance_;
53     static std::mutex instanceLock_;
54 
55     std::string appId_;
56     std::string userId_;
57 
58     std::mutex relationalDBOpenMutex_;
59     std::condition_variable relationalDBOpenCondition_;
60     std::set<std::string> relationalDBOpenSet_;
61 };
62 } // namespace DistributedDB
63 
64 #endif
65 #endif // RELATIONAL_STORE_INSTANCE_H