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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_WIN_CONFLICTS_REGISTRY_KEY_WATCHER_H_
#define CHROME_BROWSER_WIN_CONFLICTS_REGISTRY_KEY_WATCHER_H_
#include <memory>
#include <string>
#include "base/functional/callback.h"
#include "base/win/registry.h"
// This class monitors a registry key to detect if it gets deleted. Delete the
// watcher to stop the monitoring.
class RegistryKeyWatcher {
public:
// Creates a watcher that immediately starts monitoring the |subkey|. Returns
// null if there was an error during the initialization.
static std::unique_ptr<RegistryKeyWatcher> Create(
HKEY root,
const std::wstring& subkey,
REGSAM wow64access,
base::OnceClosure on_registry_key_deleted);
RegistryKeyWatcher(const RegistryKeyWatcher&) = delete;
RegistryKeyWatcher& operator=(const RegistryKeyWatcher&) = delete;
~RegistryKeyWatcher();
private:
RegistryKeyWatcher(HKEY root,
const std::wstring& subkey,
REGSAM wow64access,
base::OnceClosure on_registry_key_deleted);
// Starts the monitoring on the registry key.
void StartWatching();
// Returns true if the registry key is being watched.
bool IsWatching();
// Callback for modifications on the registry key.
void OnRegistryKeyChanged();
// The registry key being watched.
std::unique_ptr<base::win::RegKey> registry_key_;
// Invoked when the registry key is deleted.
base::OnceClosure on_registry_key_deleted_;
};
#endif // CHROME_BROWSER_WIN_CONFLICTS_REGISTRY_KEY_WATCHER_H_
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