Componentize PrefSyncableService and support classes.

chrome/browser/prefs/pref_service_syncable.cc

-// 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.
-
-#include "chrome/browser/prefs/pref_service_syncable.h"
-
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/files/file_path.h"
-#include "base/prefs/default_pref_store.h"
-#include "base/prefs/overlay_user_pref_store.h"
-#include "base/prefs/pref_notifier_impl.h"
-#include "base/prefs/pref_registry.h"
-#include "base/prefs/pref_value_store.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/value_conversions.h"
-#include "chrome/browser/prefs/pref_model_associator.h"
-#include "chrome/browser/prefs/pref_service_syncable_observer.h"
-#include "components/pref_registry/pref_registry_syncable.h"
-
-PrefServiceSyncable::PrefServiceSyncable(
-    PrefNotifierImpl* pref_notifier,
-    PrefValueStore* pref_value_store,
-    PersistentPrefStore* user_prefs,
-    user_prefs::PrefRegistrySyncable* pref_registry,
-    const PrefModelAssociatorClient* pref_model_associator_client,
-    base::Callback<void(PersistentPrefStore::PrefReadError)>
-        read_error_callback,
-    bool async)
-    : PrefService(pref_notifier,
-                  pref_value_store,
-                  user_prefs,
-                  pref_registry,
-                  read_error_callback,
-                  async),
-      pref_sync_associator_(pref_model_associator_client, syncer::PREFERENCES),
-      priority_pref_sync_associator_(pref_model_associator_client,
-                                     syncer::PRIORITY_PREFERENCES) {
-  pref_sync_associator_.SetPrefService(this);
-  priority_pref_sync_associator_.SetPrefService(this);
-
-  // Let PrefModelAssociators know about changes to preference values.
-  pref_value_store->set_callback(base::Bind(
-      &PrefServiceSyncable::ProcessPrefChange, base::Unretained(this)));
-
-  // Add already-registered syncable preferences to PrefModelAssociator.
-  for (PrefRegistry::const_iterator it = pref_registry->begin();
-       it != pref_registry->end(); ++it) {
-    const std::string& path = it->first;
-    AddRegisteredSyncablePreference(path,
-                                    pref_registry_->GetRegistrationFlags(path));
-  }
-
-  // Watch for syncable preferences registered after this point.
-  pref_registry->SetSyncableRegistrationCallback(
-      base::Bind(&PrefServiceSyncable::AddRegisteredSyncablePreference,
-                 base::Unretained(this)));
-}
-
-PrefServiceSyncable::~PrefServiceSyncable() {
-  // Remove our callback from the registry, since it may outlive us.
-  user_prefs::PrefRegistrySyncable* registry =
-      static_cast<user_prefs::PrefRegistrySyncable*>(pref_registry_.get());
-  registry->SetSyncableRegistrationCallback(
-      user_prefs::PrefRegistrySyncable::SyncableRegistrationCallback());
-}
-
-PrefServiceSyncable* PrefServiceSyncable::CreateIncognitoPrefService(
-    PrefStore* incognito_extension_pref_store,
-    const std::vector<const char*>& overlay_pref_names) {
-  pref_service_forked_ = true;
-  PrefNotifierImpl* pref_notifier = new PrefNotifierImpl();
-  OverlayUserPrefStore* incognito_pref_store =
-      new OverlayUserPrefStore(user_pref_store_.get());
-  for (const char* overlay_pref_name : overlay_pref_names)
-    incognito_pref_store->RegisterOverlayPref(overlay_pref_name);
-
-  scoped_refptr<user_prefs::PrefRegistrySyncable> forked_registry =
-      static_cast<user_prefs::PrefRegistrySyncable*>(
-          pref_registry_.get())->ForkForIncognito();
-  PrefServiceSyncable* incognito_service = new PrefServiceSyncable(
-      pref_notifier,
-      pref_value_store_->CloneAndSpecialize(NULL,  // managed
-                                            NULL,  // supervised_user
-                                            incognito_extension_pref_store,
-                                            NULL,  // command_line_prefs
-                                            incognito_pref_store,
-                                            NULL,  // recommended
-                                            forked_registry->defaults().get(),
-                                            pref_notifier),
-      incognito_pref_store,
-      forked_registry.get(),
-      pref_sync_associator_.client(),
-      read_error_callback_,
-      false);
-  return incognito_service;
-}
-
-bool PrefServiceSyncable::IsSyncing() {
-  return pref_sync_associator_.models_associated();
-}
-
-bool PrefServiceSyncable::IsPrioritySyncing() {
-  return priority_pref_sync_associator_.models_associated();
-}
-
-bool PrefServiceSyncable::IsPrefSynced(const std::string& name) const {
-  return pref_sync_associator_.IsPrefSynced(name) ||
-         priority_pref_sync_associator_.IsPrefSynced(name);
-}
-
-void PrefServiceSyncable::AddObserver(PrefServiceSyncableObserver* observer) {
-  observer_list_.AddObserver(observer);
-}
-
-void PrefServiceSyncable::RemoveObserver(
-    PrefServiceSyncableObserver* observer) {
-  observer_list_.RemoveObserver(observer);
-}
-
-syncer::SyncableService* PrefServiceSyncable::GetSyncableService(
-    const syncer::ModelType& type) {
-  if (type == syncer::PREFERENCES) {
-    return &pref_sync_associator_;
-  } else if (type == syncer::PRIORITY_PREFERENCES) {
-    return &priority_pref_sync_associator_;
-  } else {
-    NOTREACHED() << "invalid model type: " << type;
-    return NULL;
-  }
-}
-
-void PrefServiceSyncable::UpdateCommandLinePrefStore(
-    PrefStore* cmd_line_store) {
-  // If |pref_service_forked_| is true, then this PrefService and the forked
-  // copies will be out of sync.
-  DCHECK(!pref_service_forked_);
-  PrefService::UpdateCommandLinePrefStore(cmd_line_store);
-}
-
-void PrefServiceSyncable::AddSyncedPrefObserver(const std::string& name,
-                                                SyncedPrefObserver* observer) {
-  pref_sync_associator_.AddSyncedPrefObserver(name, observer);
-  priority_pref_sync_associator_.AddSyncedPrefObserver(name, observer);
-}
-
-void PrefServiceSyncable::RemoveSyncedPrefObserver(
-    const std::string& name,
-    SyncedPrefObserver* observer) {
-  pref_sync_associator_.RemoveSyncedPrefObserver(name, observer);
-  priority_pref_sync_associator_.RemoveSyncedPrefObserver(name, observer);
-}
-
-// Set the PrefModelAssociatorClient to use for that object during tests.
-void PrefServiceSyncable::SetPrefModelAssociatorClientForTesting(
-    const PrefModelAssociatorClient* pref_model_associator_client) {
-  pref_sync_associator_.SetPrefModelAssociatorClientForTesting(
-      pref_model_associator_client);
-  priority_pref_sync_associator_.SetPrefModelAssociatorClientForTesting(
-      pref_model_associator_client);
-}
-
-void PrefServiceSyncable::AddRegisteredSyncablePreference(
-    const std::string& path,
-    uint32 flags) {
-  DCHECK(FindPreference(path));
-  if (flags & user_prefs::PrefRegistrySyncable::SYNCABLE_PREF) {
-    pref_sync_associator_.RegisterPref(path.c_str());
-  } else if (flags & user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF) {
-    priority_pref_sync_associator_.RegisterPref(path.c_str());
-  }
-}
-
-void PrefServiceSyncable::OnIsSyncingChanged() {
-  FOR_EACH_OBSERVER(PrefServiceSyncableObserver, observer_list_,
-                    OnIsSyncingChanged());
-}
-
-void PrefServiceSyncable::ProcessPrefChange(const std::string& name) {
-  pref_sync_associator_.ProcessPrefChange(name);
-  priority_pref_sync_associator_.ProcessPrefChange(name);
-}