1 //
2 // Copyright (C) 2016 The Android Open Source Project
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //      http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 
17 #ifndef UPDATE_ENGINE_DAEMON_STATE_INTERFACE_H_
18 #define UPDATE_ENGINE_DAEMON_STATE_INTERFACE_H_
19 
20 #include "update_engine/service_observer_interface.h"
21 
22 #include <memory>
23 
24 namespace chromeos_update_engine {
25 
26 class DaemonStateInterface {
27  public:
28   virtual ~DaemonStateInterface() = default;
29 
30   // Start the daemon loop. Should be called only once to start the daemon's
31   // main functionality.
32   virtual bool StartUpdater() = 0;
33 
34   // Add and remove an observer. All the registered observers will be called
35   // whenever there's a new status to update.
36   virtual void AddObserver(ServiceObserverInterface* observer) = 0;
37   virtual void RemoveObserver(ServiceObserverInterface* observer) = 0;
38 
39  protected:
40   DaemonStateInterface() = default;
41 };
42 
43 }  // namespace chromeos_update_engine
44 
45 #endif  // UPDATE_ENGINE_DAEMON_STATE_INTERFACE_H_
46