extensions/browser/api/storage/storage_frontend.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_STORAGE_FRONTEND_H_
   6 #define EXTENSIONS_BROWSER_API_STORAGE_STORAGE_FRONTEND_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "extensions/browser/api/storage/settings_namespace.h"
  14 #include "extensions/browser/api/storage/settings_observer.h"
  15 #include "extensions/browser/api/storage/settings_storage_factory.h"
  16 #include "extensions/browser/api/storage/value_store_cache.h"
  17 #include "extensions/browser/browser_context_keyed_api_factory.h"
  18
  19 namespace content {
  20 class BrowserContext;
  21 }
  22
  23 namespace extensions {
  24
  25 // The component of the Storage API which runs on the UI thread.
  26 class StorageFrontend : public BrowserContextKeyedAPI {
  27  public:
  28   // Returns the current instance for |context|.
  29   static StorageFrontend* Get(content::BrowserContext* context);
  30
  31   // Creates with a specific |storage_factory|. Caller owns the object.
  32   static StorageFrontend* CreateForTesting(
  33       const scoped_refptr<SettingsStorageFactory>& storage_factory,
  34       content::BrowserContext* context);
  35
  36   // Public so tests can create and delete their own instances.
  37   virtual ~StorageFrontend();
  38
  39   // Returns the value store cache for |settings_namespace|.
  40   ValueStoreCache* GetValueStoreCache(
  41       settings_namespace::Namespace settings_namespace) const;
  42
  43   // Returns true if |settings_namespace| is a valid namespace.
  44   bool IsStorageEnabled(settings_namespace::Namespace settings_namespace) const;
  45
  46   // Runs |callback| with the storage area of the given |settings_namespace|
  47   // for the |extension|.
  48   void RunWithStorage(scoped_refptr<const Extension> extension,
  49                       settings_namespace::Namespace settings_namespace,
  50                       const ValueStoreCache::StorageCallback& callback);
  51
  52   // Deletes the settings for the given |extension_id|.
  53   void DeleteStorageSoon(const std::string& extension_id);
  54
  55   // Gets the thread-safe observer list.
  56   scoped_refptr<SettingsObserverList> GetObservers();
  57
  58   void DisableStorageForTesting(
  59       settings_namespace::Namespace settings_namespace);
  60
  61   // BrowserContextKeyedAPI implementation.
  62   static BrowserContextKeyedAPIFactory<StorageFrontend>* GetFactoryInstance();
  63   static const char* service_name();
  64   static const bool kServiceRedirectedInIncognito = true;
  65   static const bool kServiceIsNULLWhileTesting = true;
  66
  67  private:
  68   friend class BrowserContextKeyedAPIFactory<StorageFrontend>;
  69
  70   typedef std::map<settings_namespace::Namespace, ValueStoreCache*> CacheMap;
  71
  72   // Constructor for normal BrowserContextKeyedAPI usage.
  73   explicit StorageFrontend(content::BrowserContext* context);
  74
  75   // Constructor for tests.
  76   StorageFrontend(const scoped_refptr<SettingsStorageFactory>& storage_factory,
  77                   content::BrowserContext* context);
  78
  79   void Init(const scoped_refptr<SettingsStorageFactory>& storage_factory);
  80
  81   // The (non-incognito) browser context this Frontend belongs to.
  82   content::BrowserContext* const browser_context_;
  83
  84   // List of observers to settings changes.
  85   scoped_refptr<SettingsObserverList> observers_;
  86
  87   // Observer for |browser_context_|.
  88   scoped_ptr<SettingsObserver> browser_context_observer_;
  89
  90   // Maps a known namespace to its corresponding ValueStoreCache. The caches
  91   // are owned by this object.
  92   CacheMap caches_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(StorageFrontend);
  95 };
  96
  97 }  // namespace extensions
  98
  99 #endif  // EXTENSIONS_BROWSER_API_STORAGE_STORAGE_FRONTEND_H_