chromium/components/prefs/segregated_pref_store.h

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_PREFS_SEGREGATED_PREF_STORE_H_
#define COMPONENTS_PREFS_SEGREGATED_PREF_STORE_H_

#include <stdint.h>

#include <memory>
#include <optional>
#include <set>
#include <string_view>

#include "base/compiler_specific.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "components/prefs/persistent_pref_store.h"
#include "components/prefs/pref_name_set.h"
#include "components/prefs/prefs_export.h"

// Provides a unified PersistentPrefStore implementation that splits its storage
// and retrieval between two underlying PersistentPrefStore instances: a set of
// preference names is used to partition the preferences.
//
// Combines properties of the two stores as follows:
//   * The unified read error will be:
//                           Selected Store Error
//    Default Store Error | NO_ERROR      | NO_FILE       | other selected |
//               NO_ERROR | NO_ERROR      | NO_ERROR      | other selected |
//               NO_FILE  | NO_FILE       | NO_FILE       | NO_FILE        |
//          other default | other default | other default | other default  |
//   * The unified initialization success, initialization completion, and
//     read-only state are the boolean OR of the underlying stores' properties.
class COMPONENTS_PREFS_EXPORT SegregatedPrefStore : public PersistentPrefStore { … };

#endif  // COMPONENTS_PREFS_SEGREGATED_PREF_STORE_H_