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
15namespace chromeos {
16
17// NetworkStateDetails contains the information about
18// network status.
19class 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.
48class 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