extensions/browser/api/storage/settings_storage_factory.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_FACTORY_H_
   6 #define EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_FACTORY_H_
   7
   8 #include <string>
   9
  10 #include "base/files/file_path.h"
  11 #include "base/memory/ref_counted.h"
  12
  13 class ValueStore;
  14
  15 namespace extensions {
  16
  17 // Factory for creating SettingStorage instances.
  18 //
  19 // Refcouted because it's just too messy to distribute these objects between
  20 // ValueStoreCache instances any other way.
  21 class SettingsStorageFactory
  22     : public base::RefCountedThreadSafe<SettingsStorageFactory> {
  23  public:
  24   // Creates a new ValueStore area for an extension under |base_path|.
  25   // Return NULL to indicate failure.  Must be called on the FILE thread.
  26   virtual ValueStore* Create(const base::FilePath& base_path,
  27                              const std::string& extension_id) = 0;
  28
  29   // Deletes the database for the extension, if one exists.
  30   // Note: it is important to delete references to the database if any are
  31   // held, because ValueStores will create themselves if there is no file.
  32   virtual void DeleteDatabaseIfExists(const base::FilePath& base_path,
  33                                       const std::string& extension_id) = 0;
  34
  35  protected:
  36   friend class base::RefCountedThreadSafe<SettingsStorageFactory>;
  37   virtual ~SettingsStorageFactory() {}
  38 };
  39
  40 }  // namespace extensions
  41
  42 #endif  // EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_FACTORY_H_