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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 CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_
      6 #define CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/sequenced_task_runner_helpers.h"
     11 #include "content/common/content_export.h"
     12 
     13 namespace webkit_blob {
     14 class BlobStorageController;
     15 }
     16 
     17 namespace content {
     18 class BrowserContext;
     19 struct ChromeBlobStorageContextDeleter;
     20 
     21 // A context class that keeps track of BlobStorageController used by the chrome.
     22 // There is an instance associated with each BrowserContext. There could be
     23 // multiple URLRequestContexts in the same browser context that refers to the
     24 // same instance.
     25 //
     26 // All methods, except the ctor, are expected to be called on
     27 // the IO thread (unless specifically called out in doc comments).
     28 class CONTENT_EXPORT ChromeBlobStorageContext
     29     : public base::RefCountedThreadSafe<ChromeBlobStorageContext,
     30                                         ChromeBlobStorageContextDeleter> {
     31  public:
     32   ChromeBlobStorageContext();
     33 
     34   static ChromeBlobStorageContext* GetFor(
     35       BrowserContext* browser_context);
     36 
     37   void InitializeOnIOThread();
     38 
     39   webkit_blob::BlobStorageController* controller() const {
     40     return controller_.get();
     41   }
     42 
     43  protected:
     44   virtual ~ChromeBlobStorageContext();
     45 
     46  private:
     47   friend class base::DeleteHelper<ChromeBlobStorageContext>;
     48   friend class base::RefCountedThreadSafe<ChromeBlobStorageContext,
     49                                           ChromeBlobStorageContextDeleter>;
     50   friend struct ChromeBlobStorageContextDeleter;
     51 
     52   void DeleteOnCorrectThread() const;
     53 
     54   scoped_ptr<webkit_blob::BlobStorageController> controller_;
     55 };
     56 
     57 struct ChromeBlobStorageContextDeleter {
     58   static void Destruct(const ChromeBlobStorageContext* context) {
     59     context->DeleteOnCorrectThread();
     60   }
     61 };
     62 
     63 }  // namespace content
     64 
     65 #endif  // CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_
     66