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      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_
     83