net/android/network_change_notifier_android.h

   1 // Copyright (c) 2012 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_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_
   6 #define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_
   7
   8 #include "base/android/jni_android.h"
   9 #include "base/basictypes.h"
  10 #include "base/compiler_specific.h"
  11 #include "net/android/network_change_notifier_delegate_android.h"
  12 #include "net/base/network_change_notifier.h"
  13
  14 namespace net {
  15
  16 struct DnsConfig;
  17 class NetworkChangeNotifierAndroidTest;
  18 class NetworkChangeNotifierFactoryAndroid;
  19
  20 // NetworkChangeNotifierAndroid observes network events from the Android
  21 // notification system and forwards them to observers.
  22 //
  23 // The implementation is complicated by the differing lifetime and thread
  24 // affinity requirements of Android notifications and of NetworkChangeNotifier.
  25 //
  26 // High-level overview:
  27 // NetworkChangeNotifier.java - Receives notifications from Android system, and
  28 // notifies native code via JNI (on the main application thread).
  29 // NetworkChangeNotifierDelegateAndroid ('Delegate') - Listens for notifications
  30 //   sent via JNI on the main application thread, and forwards them to observers
  31 //   on their threads. Owned by Factory, lives exclusively on main application
  32 //   thread.
  33 // NetworkChangeNotifierFactoryAndroid ('Factory') - Creates the Delegate on the
  34 //   main thread to receive JNI events, and vends Notifiers. Lives exclusively
  35 //   on main application thread, and outlives all other classes.
  36 // NetworkChangeNotifierAndroid ('Notifier') - Receives event notifications from
  37 //   the Delegate. Processes and forwards these events to the
  38 //   NetworkChangeNotifier observers on their threads. May live on any thread
  39 //   and be called by any thread.
  40 //
  41 // For more details, see the implementation file.
  42 class NET_EXPORT_PRIVATE NetworkChangeNotifierAndroid
  43     : public NetworkChangeNotifier,
  44       public NetworkChangeNotifierDelegateAndroid::Observer {
  45  public:
  46   ~NetworkChangeNotifierAndroid() override;
  47
  48   // NetworkChangeNotifier:
  49   ConnectionType GetCurrentConnectionType() const override;
  50   // Requires ACCESS_WIFI_STATE permission in order to provide precise WiFi link
  51   // speed.
  52   double GetCurrentMaxBandwidth() const override;
  53
  54   // NetworkChangeNotifierDelegateAndroid::Observer:
  55   void OnConnectionTypeChanged() override;
  56   void OnMaxBandwidthChanged(double max_bandwidth_mbps) override;
  57
  58   static bool Register(JNIEnv* env);
  59
  60   // Promote GetMaxBandwidthForConnectionSubtype to public for the Android
  61   // delegate class.
  62   using NetworkChangeNotifier::GetMaxBandwidthForConnectionSubtype;
  63
  64  private:
  65   friend class NetworkChangeNotifierAndroidTest;
  66   friend class NetworkChangeNotifierFactoryAndroid;
  67
  68   class DnsConfigServiceThread;
  69
  70   NetworkChangeNotifierAndroid(NetworkChangeNotifierDelegateAndroid* delegate,
  71                                const DnsConfig* dns_config_for_testing);
  72
  73   static NetworkChangeCalculatorParams NetworkChangeCalculatorParamsAndroid();
  74
  75   NetworkChangeNotifierDelegateAndroid* const delegate_;
  76   scoped_ptr<DnsConfigServiceThread> dns_config_service_thread_;
  77
  78   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierAndroid);
  79 };
  80
  81 }  // namespace net
  82
  83 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_