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_DNS_NOTIFY_WATCHER_MAC_H_ 6 #define NET_DNS_NOTIFY_WATCHER_MAC_H_ 7 8 #include "base/callback.h" 9 #include "base/message_loop/message_loop.h" 10 11 namespace net { 12 13 // Watches for notifications from Libnotify and delivers them to a Callback. 14 // After failure the watch is cancelled and will have to be restarted. 15 class NotifyWatcherMac : public base::MessageLoopForIO::Watcher { 16 public: 17 // Called on received notification with true on success and false on error. 18 typedef base::Callback<void(bool succeeded)> CallbackType; 19 20 NotifyWatcherMac(); 21 22 // When deleted, automatically cancels. 23 virtual ~NotifyWatcherMac(); 24 25 // Registers for notifications for |key|. Returns true if succeeds. If so, 26 // will deliver asynchronous notifications and errors to |callback|. 27 bool Watch(const char* key, const CallbackType& callback); 28 29 // Cancels the watch. 30 void Cancel(); 31 32 private: 33 // MessageLoopForIO::Watcher: 34 virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE; 35 virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE {} 36 37 int notify_fd_; 38 int notify_token_; 39 CallbackType callback_; 40 base::MessageLoopForIO::FileDescriptorWatcher watcher_; 41 42 DISALLOW_COPY_AND_ASSIGN(NotifyWatcherMac); 43 }; 44 45 } // namespace net 46 47 #endif // NET_DNS_NOTIFY_WATCHER_MAC_H_ 48
