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// Copyright (c) 2012 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_DNS_NOTIFY_WATCHER_MAC_H_
#define NET_DNS_NOTIFY_WATCHER_MAC_H_
#include "base/callback.h"
#include "base/message_loop/message_loop.h"
namespace net {
// Watches for notifications from Libnotify and delivers them to a Callback.
// After failure the watch is cancelled and will have to be restarted.
class NotifyWatcherMac : public base::MessageLoopForIO::Watcher {
public:
// Called on received notification with true on success and false on error.
typedef base::Callback<void(bool succeeded)> CallbackType;
NotifyWatcherMac();
// When deleted, automatically cancels.
virtual ~NotifyWatcherMac();
// Registers for notifications for |key|. Returns true if succeeds. If so,
// will deliver asynchronous notifications and errors to |callback|.
bool Watch(const char* key, const CallbackType& callback);
// Cancels the watch.
void Cancel();
private:
// MessageLoopForIO::Watcher:
virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE {}
int notify_fd_;
int notify_token_;
CallbackType callback_;
base::MessageLoopForIO::FileDescriptorWatcher watcher_;
DISALLOW_COPY_AND_ASSIGN(NotifyWatcherMac);
};
} // namespace net
#endif // NET_DNS_NOTIFY_WATCHER_MAC_H_
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