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      1 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_SYNC_FILE_SYSTEM_EXTENSION_SYNC_EVENT_OBSERVER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_API_SYNC_FILE_SYSTEM_EXTENSION_SYNC_EVENT_OBSERVER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/values.h"
     12 #include "chrome/browser/sync_file_system/sync_event_observer.h"
     13 #include "extensions/browser/browser_context_keyed_api_factory.h"
     14 
     15 namespace content {
     16 class BrowserContext;
     17 }
     18 
     19 namespace sync_file_system {
     20 class SyncFileSystemService;
     21 }
     22 
     23 namespace extensions {
     24 
     25 // Observes changes in SyncFileSystem and relays events to JS Extension API.
     26 class ExtensionSyncEventObserver : public sync_file_system::SyncEventObserver,
     27                                    public BrowserContextKeyedAPI {
     28  public:
     29   static BrowserContextKeyedAPIFactory<ExtensionSyncEventObserver>*
     30       GetFactoryInstance();
     31 
     32   explicit ExtensionSyncEventObserver(content::BrowserContext* context);
     33   virtual ~ExtensionSyncEventObserver();
     34 
     35   void InitializeForService(
     36       sync_file_system::SyncFileSystemService* sync_service);
     37 
     38   // KeyedService override.
     39   virtual void Shutdown() OVERRIDE;
     40 
     41   // sync_file_system::SyncEventObserver interface implementation.
     42   virtual void OnSyncStateUpdated(
     43       const GURL& app_origin,
     44       sync_file_system::SyncServiceState state,
     45       const std::string& description) OVERRIDE;
     46 
     47   virtual void OnFileSynced(const storage::FileSystemURL& url,
     48                             sync_file_system::SyncFileStatus status,
     49                             sync_file_system::SyncAction action,
     50                             sync_file_system::SyncDirection direction) OVERRIDE;
     51 
     52  private:
     53   friend class BrowserContextKeyedAPIFactory<ExtensionSyncEventObserver>;
     54 
     55   // Returns an empty string if the extension |app_origin| cannot be found
     56   // in the installed extension list.
     57   std::string GetExtensionId(const GURL& app_origin);
     58 
     59   // BrowserContextKeyedAPI implementation.
     60   static const char* service_name() { return "ExtensionSyncEventObserver"; }
     61   static const bool kServiceIsCreatedWithBrowserContext = false;
     62 
     63   content::BrowserContext* browser_context_;
     64 
     65   // Not owned. If not null, then this is registered to SyncFileSystemService.
     66   sync_file_system::SyncFileSystemService* sync_service_;
     67 
     68   void BroadcastOrDispatchEvent(const GURL& app_origin,
     69                                 const std::string& event_name,
     70                                 scoped_ptr<base::ListValue> value);
     71 
     72   DISALLOW_COPY_AND_ASSIGN(ExtensionSyncEventObserver);
     73 };
     74 
     75 template <>
     76 void BrowserContextKeyedAPIFactory<
     77     ExtensionSyncEventObserver>::DeclareFactoryDependencies();
     78 
     79 }  // namespace extensions
     80 
     81 #endif  // CHROME_BROWSER_EXTENSIONS_API_SYNC_FILE_SYSTEM_EXTENSION_SYNC_EVENT_OBSERVER_H_
     82