Refactored SettingsFrontend and forwarding of calls to the backends.

chrome/browser/extensions/settings/settings_storage_frontend.h

+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_FRONTEND_H_
+#define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_FRONTEND_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/extensions/settings/settings_namespace_frontend.h"
+#include "chrome/browser/extensions/settings/settings_observer.h"
+#include "chrome/browser/extensions/settings/settings_storage_quota_enforcer.h"
+
+class FilePath;
+
+namespace extensions {
+
+class SettingsBackend;
+class SettingsStorageFactory;
+
+// The frontend for the LOCAL and SYNC namespaces. It owns a backend for
+// apps and another for extensions. Each backend takes care of persistence and
+// syncing.
+class SettingsStorageFrontend : public SettingsNamespaceFrontend {

[not at google - send to devlin, 2012/07/18 07:46:18]

If you go with the ValueStoreCache thing, call this SyncOrLocalValueStoreCache?
Or some variation on that.

[Joao da Silva, 2012/07/18 21:40:25]

Done.

+ public:
+  SettingsStorageFrontend(settings_namespace::Namespace settings_namespace,
+                          const scoped_refptr<SettingsStorageFactory>& factory,
+                          const SettingsStorageQuotaEnforcer::Limits& quota,
+                          const scoped_refptr<SettingsObserverList>& observers,
+                          const FilePath& profile_path);
+  virtual ~SettingsStorageFrontend();
+
+  // This specific implementation executes the |callback| in the FILE thread,
+  // with the storage for |extension| provided by the appropriate backend.
+  virtual void RunWithStorage(const Extension* extension,
+                              const StorageCallback& callback) OVERRIDE;
+
+  virtual void DeleteStorageSoon(const std::string& extension_id) OVERRIDE;
+
+  SettingsBackend* GetAppBackend() const;
+  SettingsBackend* GetExtensionBackend() const;
+
+ private:
+  class BackendWrapper;
+
+  settings_namespace::Namespace settings_namespace_;
+  scoped_refptr<BackendWrapper> app_backend_;
+  scoped_refptr<BackendWrapper> extension_backend_;
+
+  DISALLOW_COPY_AND_ASSIGN(SettingsStorageFrontend);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_FRONTEND_H_