net/android/network_change_notifier_delegate_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_DELEGATE_ANDROID_H_
   6 #define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_ANDROID_H_
   7
   8 #include "base/android/jni_android.h"
   9 #include "base/basictypes.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/observer_list_threadsafe.h"
  12 #include "base/synchronization/lock.h"
  13 #include "base/threading/thread_checker.h"
  14 #include "net/base/network_change_notifier.h"
  15
  16 namespace net {
  17
  18 // Delegate used to thread-safely notify NetworkChangeNotifierAndroid whenever a
  19 // network connection change notification is signaled by the Java side (on the
  20 // JNI thread).
  21 // All the methods exposed below must be called exclusively on the JNI thread
  22 // unless otherwise stated (e.g. AddObserver()/RemoveObserver()).
  23 class NET_EXPORT_PRIVATE NetworkChangeNotifierDelegateAndroid {
  24  public:
  25   typedef NetworkChangeNotifier::ConnectionType ConnectionType;
  26
  27   // Observer interface implemented by NetworkChangeNotifierAndroid which
  28   // subscribes to network change notifications fired by the delegate (and
  29   // initiated by the Java side).
  30   class Observer {
  31    public:
  32     virtual ~Observer() {}
  33
  34     // Updates the current connection type.
  35     virtual void OnConnectionTypeChanged() = 0;
  36   };
  37
  38   NetworkChangeNotifierDelegateAndroid();
  39   ~NetworkChangeNotifierDelegateAndroid();
  40
  41   // Called from NetworkChangeNotifierAndroid.java on the JNI thread whenever
  42   // the connection type changes. This updates the current connection type seen
  43   // by this class and forwards the notification to the observers that
  44   // subscribed through AddObserver().
  45   void NotifyConnectionTypeChanged(JNIEnv* env,
  46                                    jobject obj,
  47                                    jint new_connection_type);
  48   jint GetConnectionType(JNIEnv* env, jobject obj) const;
  49
  50   // These methods can be called on any thread. Note that the provided observer
  51   // will be notified on the thread AddObserver() is called on.
  52   void AddObserver(Observer* observer);
  53   void RemoveObserver(Observer* observer);
  54
  55   // Can be called from any thread.
  56   ConnectionType GetCurrentConnectionType() const;
  57
  58   // Initializes JNI bindings.
  59   static bool Register(JNIEnv* env);
  60
  61  private:
  62   friend class BaseNetworkChangeNotifierAndroidTest;
  63
  64   void SetCurrentConnectionType(ConnectionType connection_type);
  65
  66   // Methods calling the Java side exposed for testing.
  67   void SetOnline();
  68   void SetOffline();
  69
  70   base::ThreadChecker thread_checker_;
  71   scoped_refptr<ObserverListThreadSafe<Observer> > observers_;
  72   scoped_refptr<base::SingleThreadTaskRunner> jni_task_runner_;
  73   base::android::ScopedJavaGlobalRef<jobject> java_network_change_notifier_;
  74   mutable base::Lock connection_type_lock_;  // Protects the state below.
  75   ConnectionType connection_type_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierDelegateAndroid);
  78 };
  79
  80 }  // namespace net
  81
  82 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_H_