// Copyright (c) 2010 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_BASE_NETWORK_CONFIG_WATCHER_MAC_H_
#define NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_

#include <SystemConfiguration/SCDynamicStore.h>

#include "base/basictypes.h"
#include "base/message_loop.h"
#include "base/scoped_cftyperef.h"
#include "base/scoped_ptr.h"

namespace base {
class Thread;
}

namespace net {

// Base class for watching the Mac OS system network settings.
class NetworkConfigWatcherMac : public MessageLoop::DestructionObserver {
 public:
  NetworkConfigWatcherMac();

 protected:
  virtual ~NetworkConfigWatcherMac();

  // Called to register the notification keys on |store|.
  // Implementors are expected to call SCDynamicStoreSetNotificationKeys().
  // Will be called on the notifier thread.
  virtual void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store) = 0;

  // Called when one of the notification keys has changed.
  // Will be called on the notifier thread.
  virtual void OnNetworkConfigChange(CFArrayRef changed_keys) = 0;

 private:
  // Called back by OS.  Calls OnNetworkConfigChange().
  static void DynamicStoreCallback(SCDynamicStoreRef /* store */,
                                   CFArrayRef changed_keys,
                                   void* config);

  // MessageLoop::DestructionObserver:
  virtual void WillDestroyCurrentMessageLoop();

  // Called on the notifier thread to initialize the notification
  // implementation.  The SystemConfiguration calls in this function can lead to
  // contention early on, so we invoke this function later on in startup to keep
  // it fast.
  void Init();

  // The thread used to listen for notifications.  This relays the notification
  // to the registered observers without posting back to the thread the object
  // was created on.
  scoped_ptr<base::Thread> notifier_thread_;

  scoped_cftyperef<CFRunLoopSourceRef> run_loop_source_;

  DISALLOW_COPY_AND_ASSIGN(NetworkConfigWatcherMac);
};

}  // namespace net

#endif  // NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_