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 LOCK_STATUS_OBSERVER_H
17 #define LOCK_STATUS_OBSERVER_H
18 
19 #include "notification_chain.h"
20 #include "runtime_context.h"
21 
22 namespace DistributedDB {
23 class LockStatusObserver final {
24 public:
25     LockStatusObserver();
26     ~LockStatusObserver();
27     DISABLE_COPY_ASSIGN_MOVE(LockStatusObserver);
28     int Start();
29     void Stop();
30     void OnStatusChange(bool isLocked) const;
31     bool IsStarted() const;
32     NotificationChain::Listener *RegisterLockStatusChangedLister(const LockStatusNotifier &action, int &errCode) const;
33 
34 private:
35     static const EventType LOCK_STATUS_CHANGE_EVENT = 2;
36     int PrepareNotifierChain();
37     NotificationChain *lockStatusChangedNotifier_;
38     bool isStarted_;
39 };
40 }
41 
42 #endif
43