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 DEVICE_MANAGER_H
17 #define DEVICE_MANAGER_H
18 
19 #include <mutex>
20 #include <set>
21 
22 #include "icommunicator.h"
23 
24 namespace DistributedDB {
25 class DeviceManager final {
26 public:
27     DeviceManager();
28     ~DeviceManager();
29 
30     DISABLE_COPY_ASSIGN_MOVE(DeviceManager);
31 
32     static int RegisterTransformFunc();
33 
34     // Calculate the length of message.
35     static uint32_t CalculateLen();
36 
37     // Initialize the DeviceManager.
38     int Initialize(ICommunicator *communicator, const std::function<void(std::string)> &onlineCallback,
39         const std::function<void(std::string)> &offlineCallback);
40 
41     // Set The Device online Callback.
42     void RegDeviceOnLineCallBack(const std::function<void(std::string)> &callback);
43 
44     // Set The Device offline Callback.
45     void RegDeviceOffLineCallBack(const std::function<void(std::string)> &callback);
46 
47     // The Device connect message callback, registered to the ICommunicator
48     void OnDeviceConnectCallback(const std::string &targetDev, bool isConnect);
49 
50     // Get The online devices list.
51     void GetOnlineDevices(std::vector<std::string> &devices) const;
52 
53 #ifndef OMIT_MULTI_VER
54     // Send a BroadCast to all online device.
55     int SendBroadCast(uint32_t msgId);
56 #endif // OMIT_MULTI_VER
57 
58     // Determine if the device is online.
59     bool IsDeviceOnline(const std::string &deviceId) const;
60 
61 private:
62 
63 #ifndef OMIT_MULTI_VER
64     // Send a local data changed broadcast.
65     int SendLocalDataChanged();
66 #endif // OMIT_MULTI_VER
67 
68     std::set<std::string> devices_;
69     std::function<void(std::string)> onlineCallback_;
70     std::function<void(std::string)> offlineCallback_;
71     ICommunicator *communicator_;
72     mutable std::mutex devicesLock_;
73 };
74 } // namespace DistributedDB
75 
76 #endif // DEVICE_MANAGER_H
77