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      1 // Copyright (c) 2010 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 #include "net/base/network_change_notifier.h"
      6 #include "build/build_config.h"
      7 #if defined(OS_WIN)
      8 #include "net/base/network_change_notifier_win.h"
      9 #elif defined(OS_LINUX)
     10 #include "net/base/network_change_notifier_linux.h"
     11 #elif defined(OS_MACOSX)
     12 #include "net/base/network_change_notifier_mac.h"
     13 #endif
     14 
     15 namespace net {
     16 
     17 namespace {
     18 
     19 // The actual singleton notifier.  The class contract forbids usage of the API
     20 // in ways that would require us to place locks around access to this object.
     21 // (The prohibition on global non-POD objects makes it tricky to do such a thing
     22 // anyway.)
     23 NetworkChangeNotifier* g_network_change_notifier = NULL;
     24 
     25 class MockNetworkChangeNotifier : public NetworkChangeNotifier {
     26  public:
     27   virtual bool IsCurrentlyOffline() const { return false; }
     28 };
     29 
     30 }  // namespace
     31 
     32 NetworkChangeNotifier::~NetworkChangeNotifier() {
     33   DCHECK_EQ(this, g_network_change_notifier);
     34   g_network_change_notifier = NULL;
     35 }
     36 
     37 NetworkChangeNotifier* NetworkChangeNotifier::Create() {
     38 #if defined(OS_WIN)
     39   return new NetworkChangeNotifierWin();
     40 #elif defined(OS_LINUX)
     41   return new NetworkChangeNotifierLinux();
     42 #elif defined(OS_MACOSX)
     43   return new NetworkChangeNotifierMac();
     44 #else
     45   NOTIMPLEMENTED();
     46   return NULL;
     47 #endif
     48 }
     49 
     50 // static
     51 bool NetworkChangeNotifier::IsOffline() {
     52   return g_network_change_notifier &&
     53          g_network_change_notifier->IsCurrentlyOffline();
     54 }
     55 
     56 // static
     57 NetworkChangeNotifier* NetworkChangeNotifier::CreateMock() {
     58   return new MockNetworkChangeNotifier();
     59 }
     60 
     61 void NetworkChangeNotifier::AddIPAddressObserver(IPAddressObserver* observer) {
     62   if (g_network_change_notifier)
     63     g_network_change_notifier->ip_address_observer_list_->AddObserver(observer);
     64 }
     65 
     66 void NetworkChangeNotifier::AddOnlineStateObserver(
     67     OnlineStateObserver* observer) {
     68   if (g_network_change_notifier) {
     69     g_network_change_notifier->online_state_observer_list_->AddObserver(
     70         observer);
     71   }
     72 }
     73 
     74 void NetworkChangeNotifier::RemoveIPAddressObserver(
     75     IPAddressObserver* observer) {
     76   if (g_network_change_notifier) {
     77     g_network_change_notifier->ip_address_observer_list_->RemoveObserver(
     78         observer);
     79   }
     80 }
     81 
     82 void NetworkChangeNotifier::RemoveOnlineStateObserver(
     83     OnlineStateObserver* observer) {
     84   if (g_network_change_notifier) {
     85     g_network_change_notifier->online_state_observer_list_->RemoveObserver(
     86         observer);
     87   }
     88 }
     89 
     90 NetworkChangeNotifier::NetworkChangeNotifier()
     91     : ip_address_observer_list_(
     92         new ObserverListThreadSafe<IPAddressObserver>(
     93             ObserverListBase<IPAddressObserver>::NOTIFY_EXISTING_ONLY)),
     94       online_state_observer_list_(
     95         new ObserverListThreadSafe<OnlineStateObserver>(
     96             ObserverListBase<OnlineStateObserver>::NOTIFY_EXISTING_ONLY)) {
     97   DCHECK(!g_network_change_notifier);
     98   g_network_change_notifier = this;
     99 }
    100 
    101 void NetworkChangeNotifier::NotifyObserversOfIPAddressChange() {
    102   if (g_network_change_notifier) {
    103     g_network_change_notifier->ip_address_observer_list_->Notify(
    104         &IPAddressObserver::OnIPAddressChanged);
    105   }
    106 }
    107 
    108 void NetworkChangeNotifier::NotifyObserversOfOnlineStateChange() {
    109   online_state_observer_list_->Notify(
    110       &OnlineStateObserver::OnOnlineStateChanged, !IsOffline());
    111 }
    112 
    113 }  // namespace net
    114