Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 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_ |