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 #include <set> 24 25 namespace chromeos_update_engine { 26 27 class DaemonStateInterface { 28 public: 29 virtual ~DaemonStateInterface() = default; 30 31 // Start the daemon loop. Should be called only once to start the daemon's 32 // main functionality. 33 virtual bool StartUpdater() = 0; 34 35 // Add and remove an observer. All the registered observers will be called 36 // whenever there's a new status to update. 37 virtual void AddObserver(ServiceObserverInterface* observer) = 0; 38 virtual void RemoveObserver(ServiceObserverInterface* observer) = 0; 39 40 // Return the set of current observers. 41 virtual const std::set<ServiceObserverInterface*>& service_observers() = 0; 42 43 protected: 44 DaemonStateInterface() = default; 45 }; 46 47 } // namespace chromeos_update_engine 48 49 #endif // UPDATE_ENGINE_DAEMON_STATE_INTERFACE_H_ 50