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
11namespace 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.
15class 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