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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_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 ~NotifyWatcherMac() override; | |
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 void OnFileCanReadWithoutBlocking(int fd) override; | |
35 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_ | |
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