1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_BASE_NETWORK_CHANGE_NOTIFIER_H_ 6 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/non_thread_safe.h" 10 11 namespace net { 12 13 // NetworkChangeNotifier monitors the system for network changes, and notifies 14 // observers on those events. 15 class NetworkChangeNotifier : public NonThreadSafe { 16 public: 17 class Observer { 18 public: ~Observer()19 virtual ~Observer() {} 20 21 // Will be called when the IP address of the primary interface changes. 22 // This includes when the primary interface itself changes. 23 virtual void OnIPAddressChanged() = 0; 24 25 protected: Observer()26 Observer() {} 27 28 private: 29 DISALLOW_COPY_AND_ASSIGN(Observer); 30 }; 31 NetworkChangeNotifier()32 NetworkChangeNotifier() {} ~NetworkChangeNotifier()33 virtual ~NetworkChangeNotifier() {} 34 35 // These functions add and remove observers to/from the NetworkChangeNotifier. 36 // Each call to AddObserver() must be matched with a corresponding call to 37 // RemoveObserver() with the same parameter. Observers must remove themselves 38 // before they get deleted, otherwise the NetworkChangeNotifier may try to 39 // notify the wrong object. 40 virtual void AddObserver(Observer* observer) = 0; 41 virtual void RemoveObserver(Observer* observer) = 0; 42 43 // This will create the platform specific default NetworkChangeNotifier. 44 static NetworkChangeNotifier* CreateDefaultNetworkChangeNotifier(); 45 46 private: 47 DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier); 48 }; 49 50 } // namespace net 51 52 #endif // NET_BASE_NETWORK_CHANGE_NOTIFIER_H_ 53