Lazily build the app list model.

chrome/browser/ui/app_list/app_list_syncable_service.h

 // Copyright 2013 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 CHROME_BROWSER_UI_APP_LIST_APP_LIST_SYNCABLE_SERVICE_H_
 #define CHROME_BROWSER_UI_APP_LIST_APP_LIST_SYNCABLE_SERVICE_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/apps/drive/drive_app_uninstall_sync_service.h"
 #include "chrome/browser/sync/glue/sync_start_util.h"
 #include "components/keyed_service/core/keyed_service.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 #include "sync/api/string_ordinal.h"
 #include "sync/api/sync_change.h"
 #include "sync/api/sync_change_processor.h"
 #include "sync/api/sync_error_factory.h"
 #include "sync/api/syncable_service.h"
 #include "sync/protocol/app_list_specifics.pb.h"
 
 class DriveAppProvider;
 class ExtensionAppModelBuilder;
 class Profile;
 
 namespace extensions {
 class ExtensionSystem;
 }
 
 namespace sync_pb {
 class AppListSpecifics;
 }
 
 namespace app_list {
 
 class AppListFolderItem;
 class AppListItem;
 class AppListModel;
 class ModelPrefUpdater;
 
 // Keyed Service that owns, stores, and syncs an AppListModel for a profile.
 class AppListSyncableService : public syncer::SyncableService,
                                public KeyedService,
-                               public DriveAppUninstallSyncService,
-                               public content::NotificationObserver {
+                               public DriveAppUninstallSyncService {
  public:
   struct SyncItem {
     SyncItem(const std::string& id,
              sync_pb::AppListSpecifics::AppListItemType type);
     ~SyncItem();
     const std::string item_id;
     sync_pb::AppListSpecifics::AppListItemType item_type;
     std::string item_name;
     std::string parent_id;
     syncer::StringOrdinal item_ordinal;
@@ skipping 16 matching lines @@
 
   // Called when properties of an item may have changed, e.g. default/oem state.
   void UpdateItem(AppListItem* app_item);
 
   // Returns the existing sync item matching |id| or NULL.
   const SyncItem* GetSyncItem(const std::string& id) const;
 
   // Sets the name of the folder for OEM apps.
   void SetOemFolderName(const std::string& name);
 
+  // Gets the app list model, building it if it doesn't yet exist.
+  AppListModel* GetModel();
+
   Profile* profile() { return profile_; }
-  AppListModel* model() { return model_.get(); }
-  size_t GetNumSyncItemsForTest() const { return sync_items_.size(); }
+  size_t GetNumSyncItemsForTest();
   const std::string& GetOemFolderNameForTest() const {
     return oem_folder_name_;
   }
   void ResetDriveAppProviderForTest();
 
   // syncer::SyncableService
   syncer::SyncMergeResult MergeDataAndStartSyncing(
       syncer::ModelType type,
       const syncer::SyncDataList& initial_sync_data,
       scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
       scoped_ptr<syncer::SyncErrorFactory> error_handler) override;
   void StopSyncing(syncer::ModelType type) override;
   syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const override;
   syncer::SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const syncer::SyncChangeList& change_list) override;
 
  private:
   class ModelObserver;
   typedef std::map<std::string, SyncItem*> SyncItemMap;
 
   // KeyedService
   void Shutdown() override;
 
   // DriveAppUninstallSyncService
   void TrackUninstalledDriveApp(const std::string& drive_app_id) override;
   void UntrackUninstalledDriveApp(const std::string& drive_app_id) override;
 
-  // content::NotificationObserver
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
   // Builds the model once ExtensionService is ready.
   void BuildModel();
 
   // Returns true if sync has restarted, otherwise runs |flare_|.
   bool SyncStarted();
 
   // If |app_item| matches an existing sync item, returns it. Otherwise adds
   // |app_item| to |sync_items_| and returns the new item. If |app_item| is
   // invalid returns NULL.
   SyncItem* FindOrAddSyncItem(AppListItem* app_item);
@@ skipping 63 matching lines @@
   // Gets the location for the OEM folder. Called when the folder is first
   // created.
   syncer::StringOrdinal GetOemFolderPos();
 
   // Returns true if an extension matching |id| exists and was installed by
   // an OEM (extension->was_installed_by_oem() is true).
   bool AppIsOem(const std::string& id);
 
   Profile* profile_;
   extensions::ExtensionSystem* extension_system_;
-  content::NotificationRegistrar registrar_;
   scoped_ptr<AppListModel> model_;
   scoped_ptr<ModelObserver> model_observer_;
   scoped_ptr<ModelPrefUpdater> model_pref_updater_;
   scoped_ptr<ExtensionAppModelBuilder> apps_builder_;
   scoped_ptr<syncer::SyncChangeProcessor> sync_processor_;
   scoped_ptr<syncer::SyncErrorFactory> sync_error_handler_;
   SyncItemMap sync_items_;
   syncer::SyncableService::StartSyncFlare flare_;
   bool initial_sync_data_processed_;
   bool first_app_list_sync_;
   std::string oem_folder_name_;
 
   // Provides integration with Drive apps.
   scoped_ptr<DriveAppProvider> drive_app_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListSyncableService);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_SYNCABLE_SERVICE_H_