content/browser/fileapi/chrome_blob_storage_context.h

   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 BlobStorageContext;
  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::BlobStorageContext* context() const {
  40     return context_.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::BlobStorageContext> context_;
  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_