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      1 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_NETWORK_STATE_NOTIFIER_H_
      6 #define CHROME_BROWSER_CHROMEOS_NETWORK_STATE_NOTIFIER_H_
      7 #pragma once
      8 
      9 #include "chrome/browser/chromeos/cros/network_library.h"
     10 
     11 #include "base/memory/singleton.h"
     12 #include "base/task.h"
     13 #include "base/time.h"
     14 
     15 namespace chromeos {
     16 
     17 // NetworkStateDetails contains the information about
     18 // network status.
     19 class NetworkStateDetails {
     20  public:
     21   enum State {
     22     UNKNOWN = 0,
     23     DISCONNECTED,
     24     CONNECTING,
     25     CONNECTED,
     26   };
     27 
     28   State state() const {
     29     return state_;
     30   }
     31 
     32  private:
     33   friend class NetworkStateNotifier;
     34 
     35   explicit NetworkStateDetails(State state)
     36       : state_(state) {
     37   }
     38 
     39   State state_;
     40 
     41   DISALLOW_COPY_AND_ASSIGN(NetworkStateDetails);
     42 };
     43 
     44 // NetworkStateNotifier sends notification when network state has
     45 // chagned. Notification is sent in UI thread.
     46 // TODO(oshima): port this to other platform. merge with
     47 // NetworkChangeNotifier if possible.
     48 class NetworkStateNotifier : public NetworkLibrary::NetworkManagerObserver {
     49  public:
     50   // Returns the singleton instance of the network state notifier;
     51   static NetworkStateNotifier* GetInstance();
     52 
     53   // The duration of being in offline. The value is undefined when
     54   // when network is connected.
     55   static base::TimeDelta GetOfflineDuration();
     56 
     57   // Returns true if the network is connected.
     58   static bool is_connected() {
     59     return GetInstance()->state_ == NetworkStateDetails::CONNECTED;
     60   }
     61 
     62   // NetworkLibrary::NetworkManagerObserver implementation.
     63   virtual void OnNetworkManagerChanged(NetworkLibrary* cros);
     64 
     65  private:
     66   friend struct DefaultSingletonTraits<NetworkStateNotifier>;
     67 
     68   // Retrieve the current state from libcros.
     69   static NetworkStateDetails::State RetrieveState();
     70 
     71   NetworkStateNotifier();
     72   virtual ~NetworkStateNotifier();
     73 
     74   // Update the current state and sends notification to observers.
     75   // This should be invoked in UI thread.
     76   void UpdateNetworkState(NetworkStateDetails::State new_state);
     77 
     78   // A factory to post a task in UI thread.
     79   ScopedRunnableMethodFactory<NetworkStateNotifier> task_factory_;
     80 
     81   // The current network state.
     82   NetworkStateDetails::State state_;
     83 
     84   // The start time of offline.
     85   base::Time offline_start_time_;
     86 
     87   DISALLOW_COPY_AND_ASSIGN(NetworkStateNotifier);
     88 };
     89 
     90 }  // namespace chromeos
     91 
     92 #endif  // CHROME_BROWSER_CHROMEOS_NETWORK_STATE_NOTIFIER_H_
     93