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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_ANDROID_H_
#define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_ANDROID_H_
#include "base/android/jni_android.h"
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list_threadsafe.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "net/base/network_change_notifier.h"
namespace net {
// Delegate used to thread-safely notify NetworkChangeNotifierAndroid whenever a
// network connection change notification is signaled by the Java side (on the
// JNI thread).
// All the methods exposed below must be called exclusively on the JNI thread
// unless otherwise stated (e.g. AddObserver()/RemoveObserver()).
class NET_EXPORT_PRIVATE NetworkChangeNotifierDelegateAndroid {
public:
typedef NetworkChangeNotifier::ConnectionType ConnectionType;
// Observer interface implemented by NetworkChangeNotifierAndroid which
// subscribes to network change notifications fired by the delegate (and
// initiated by the Java side).
class Observer {
public:
virtual ~Observer() {}
// Updates the current connection type.
virtual void OnConnectionTypeChanged() = 0;
};
NetworkChangeNotifierDelegateAndroid();
~NetworkChangeNotifierDelegateAndroid();
// Called from NetworkChangeNotifierAndroid.java on the JNI thread whenever
// the connection type changes. This updates the current connection type seen
// by this class and forwards the notification to the observers that
// subscribed through AddObserver().
void NotifyConnectionTypeChanged(JNIEnv* env,
jobject obj,
jint new_connection_type);
jint GetConnectionType(JNIEnv* env, jobject obj) const;
// These methods can be called on any thread. Note that the provided observer
// will be notified on the thread AddObserver() is called on.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Can be called from any thread.
ConnectionType GetCurrentConnectionType() const;
// Initializes JNI bindings.
static bool Register(JNIEnv* env);
private:
friend class BaseNetworkChangeNotifierAndroidTest;
void SetCurrentConnectionType(ConnectionType connection_type);
// Methods calling the Java side exposed for testing.
void SetOnline();
void SetOffline();
base::ThreadChecker thread_checker_;
scoped_refptr<ObserverListThreadSafe<Observer> > observers_;
scoped_refptr<base::SingleThreadTaskRunner> jni_task_runner_;
base::android::ScopedJavaGlobalRef<jobject> java_network_change_notifier_;
mutable base::Lock connection_type_lock_; // Protects the state below.
ConnectionType connection_type_;
DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierDelegateAndroid);
};
} // namespace net
#endif // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_H_
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