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 KV_DB_OBSERVER_HANDLE_H
17 #define KV_DB_OBSERVER_HANDLE_H
18 #include <cstdint>
19 #include <list>
20 
21 #include "macro_utils.h"
22 #include "notification_chain.h"
23 
24 namespace DistributedDB {
25 class KvDBObserverHandle {
26 public:
27     explicit KvDBObserverHandle(uint32_t mode);
28     ~KvDBObserverHandle();
29     DISABLE_COPY_ASSIGN_MOVE(KvDBObserverHandle);
30     void InsertListener(NotificationChain::Listener *listener);
31     uint32_t GetObserverMode() const;
32 private:
33     std::list<NotificationChain::Listener *> listeners_;
34     uint32_t mode_;
35 };
36 } // namespace DistributedDB
37 
38 #endif // KV_DB_OBSERVER_H
39