| // Copyright 2017 The Chromium OS 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 POWER_MANAGER_COMMON_FILE_PREFS_STORE_H_ |
| #define POWER_MANAGER_COMMON_FILE_PREFS_STORE_H_ |
| |
| #include <map> |
| #include <memory> |
| #include <string> |
| |
| #include <base/files/file_path.h> |
| #include <base/files/file_path_watcher.h> |
| |
| #include "power_manager/common/prefs.h" |
| |
| namespace power_manager { |
| |
| // PrefsStoreInterface implementation that uses files to store preferences. |
| class FilePrefsStore : public PrefsStoreInterface { |
| public: |
| explicit FilePrefsStore(const base::FilePath& pref_path); |
| FilePrefsStore(const FilePrefsStore&) = delete; |
| FilePrefsStore& operator=(const FilePrefsStore&) = delete; |
| |
| ~FilePrefsStore() override = default; |
| |
| // PrefsStoreInterface: |
| std::string GetDescription() const override; |
| bool ReadPrefString(const std::string& name, std::string* value_out) override; |
| bool WritePrefString(const std::string& name, |
| const std::string& value) override; |
| bool Watch(const PrefsStoreInterface::ChangeCallback& callback) override; |
| |
| private: |
| using FileWatcherMap = |
| std::map<std::string, std::unique_ptr<base::FilePathWatcher>>; |
| |
| // Called by |dir_watcher_| and |file_watchers_|. Calls UpdateFileWatchers() |
| // for directory changes or notifies |callback_| for pref file changes. |
| void HandlePathChanged(const base::FilePath& dir, bool error); |
| |
| void UpdateFileWatchers(); |
| |
| // Path to a directory containing pref files. |
| const base::FilePath pref_path_; |
| |
| // The callback passed to Watch(). Called when preference files change. |
| PrefsStoreInterface::ChangeCallback callback_; |
| |
| // Watches |pref_path_| for changes, calling HandleDirChanged(). |
| std::unique_ptr<base::FilePathWatcher> dir_watcher_; |
| |
| // Watches files in |pref_path_| for changes, calling HandleFileChanged(). |
| FileWatcherMap file_watchers_; |
| }; |
| |
| } // namespace power_manager |
| |
| #endif // POWER_MANAGER_COMMON_FILE_PREFS_STORE_H_ |