1// 2// Copyright (C) 2014 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 SHILL_PROPERTY_OBSERVER_INTERFACE_H_ 18#define SHILL_PROPERTY_OBSERVER_INTERFACE_H_ 19 20#include <base/macros.h> 21 22namespace shill { 23 24// An abstract interface for objects that retain a saved copy of 25// a property accessor and can report whether that value has changed. 26class PropertyObserverInterface { 27 public: 28 PropertyObserverInterface() {} 29 virtual ~PropertyObserverInterface() {} 30 31 // Update the saved value used for comparison. 32 virtual void Update() = 0; 33 34 private: 35 DISALLOW_COPY_AND_ASSIGN(PropertyObserverInterface); 36}; 37 38} // namespace shill 39 40#endif // SHILL_PROPERTY_OBSERVER_INTERFACE_H_ 41