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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_DNS_CONFIG_WATCHER_H_
#define NET_DNS_DNS_CONFIG_WATCHER_H_
#pragma once
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
namespace net {
namespace internal {
// Watches when the system DNS settings have changed. It is used by
// NetworkChangeNotifier to provide signals to registered DNSObservers.
// Depending on the platform, watches files, Windows registry, or libnotify key.
// If some watches fail, we keep the working parts, but NetworkChangeNotifier
// will mark notifications to DNSObserver with the CHANGE_DNS_WATCH_FAILED bit.
class DnsConfigWatcher {
public:
DnsConfigWatcher();
~DnsConfigWatcher();
// Starts watching system configuration for changes. The current thread must
// have a MessageLoopForIO. The signals will be delivered directly to
// the global NetworkChangeNotifier.
void Init();
// Must be called on the same thread as Init. Required if dtor will be called
// on a different thread.
void CleanUp();
private:
// Platform-specific implementation.
class Core;
scoped_ptr<Core> core_;
DISALLOW_COPY_AND_ASSIGN(DnsConfigWatcher);
};
} // namespace internal
} // namespace net
#endif // NET_DNS_DNS_CONFIG_WATCHER_H_
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