net/dns/notify_watcher_mac.h

   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_