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// Copyright (c) 2011 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_BASE_NETWORK_CHANGE_NOTIFIER_WIN_H_
#define NET_BASE_NETWORK_CHANGE_NOTIFIER_WIN_H_
#pragma once
#include <windows.h>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/timer.h"
#include "base/win/object_watcher.h"
#include "net/base/net_export.h"
#include "net/base/network_change_notifier.h"
namespace net {
// NetworkChangeNotifierWin inherits from NonThreadSafe, as all its internal
// notification code must be called on the thread it is created and destroyed
// on. All the NetworkChangeNotifier methods it implements are threadsafe.
class NET_EXPORT_PRIVATE NetworkChangeNotifierWin
: public NetworkChangeNotifier,
public base::win::ObjectWatcher::Delegate,
NON_EXPORTED_BASE(public base::NonThreadSafe) {
public:
NetworkChangeNotifierWin();
// Begins listening for a single subsequent address change. If it fails to
// start watching, it retries on a timer. Must be called only once, on the
// thread |this| was created on. This cannot be called in the constructor, as
// WatchForAddressChangeInternal is mocked out in unit tests.
// TODO(mmenke): Consider making this function a part of the
// NetworkChangeNotifier interface, so other subclasses can be
// unit tested in similar fashion, as needed.
void WatchForAddressChange();
protected:
virtual ~NetworkChangeNotifierWin();
// For unit tests only.
bool is_watching() { return is_watching_; }
void set_is_watching(bool is_watching) { is_watching_ = is_watching; }
int sequential_failures() { return sequential_failures_; }
private:
friend class NetworkChangeNotifierWinTest;
// NetworkChangeNotifier methods:
virtual bool IsCurrentlyOffline() const OVERRIDE;
// ObjectWatcher::Delegate methods:
// Must only be called on the thread |this| was created on.
virtual void OnObjectSignaled(HANDLE object) OVERRIDE;
// Notifies IP address change observers of a change immediately, and notifies
// network state change observers on a delay. Must only be called on the
// thread |this| was created on.
void NotifyObservers();
// Forwards online state notifications to parent class.
void NotifyParentOfOnlineStateChange();
// Tries to start listening for a single subsequent address change. Returns
// false on failure. The caller is responsible for updating |is_watching_|.
// Virtual for unit tests. Must only be called on the thread |this| was
// created on.
virtual bool WatchForAddressChangeInternal();
// All member variables may only be accessed on the thread |this| was created
// on.
// False when not currently watching for network change events. This only
// happens on initialization and when WatchForAddressChangeInternal fails and
// there is a pending task to try again. Needed for safe cleanup.
bool is_watching_;
base::win::ObjectWatcher addr_watcher_;
OVERLAPPED addr_overlapped_;
base::OneShotTimer<NetworkChangeNotifierWin> timer_;
// Number of times WatchForAddressChange has failed in a row.
int sequential_failures_;
// Used for calling WatchForAddressChange again on failure.
base::WeakPtrFactory<NetworkChangeNotifierWin> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierWin);
};
} // namespace net
#endif // NET_BASE_NETWORK_CHANGE_NOTIFIER_WIN_H_
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