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 storage {
  14 class BlobStorageContext;
  15 }
  16
  17 namespace content {
  18 class BlobHandle;
  19 class BrowserContext;
  20 struct ChromeBlobStorageContextDeleter;
  21
  22 // A context class that keeps track of BlobStorageController used by the chrome.
  23 // There is an instance associated with each BrowserContext. There could be
  24 // multiple URLRequestContexts in the same browser context that refers to the
  25 // same instance.
  26 //
  27 // All methods, except the ctor, are expected to be called on
  28 // the IO thread (unless specifically called out in doc comments).
  29 class CONTENT_EXPORT ChromeBlobStorageContext
  30     : public base::RefCountedThreadSafe<ChromeBlobStorageContext,
  31                                         ChromeBlobStorageContextDeleter> {
  32  public:
  33   ChromeBlobStorageContext();
  34
  35   static ChromeBlobStorageContext* GetFor(
  36       BrowserContext* browser_context);
  37
  38   void InitializeOnIOThread();
  39
  40   storage::BlobStorageContext* context() const { return context_.get(); }
  41
  42   // Returns a NULL scoped_ptr on failure.
  43   scoped_ptr<BlobHandle> CreateMemoryBackedBlob(const char* data,
  44                                                 size_t length);
  45
  46  protected:
  47   virtual ~ChromeBlobStorageContext();
  48
  49  private:
  50   friend class base::DeleteHelper<ChromeBlobStorageContext>;
  51   friend class base::RefCountedThreadSafe<ChromeBlobStorageContext,
  52                                           ChromeBlobStorageContextDeleter>;
  53   friend struct ChromeBlobStorageContextDeleter;
  54
  55   void DeleteOnCorrectThread() const;
  56
  57   scoped_ptr<storage::BlobStorageContext> context_;
  58 };
  59
  60 struct ChromeBlobStorageContextDeleter {
  61   static void Destruct(const ChromeBlobStorageContext* context) {
  62     context->DeleteOnCorrectThread();
  63   }
  64 };
  65
  66 }  // namespace content
  67
  68 #endif  // CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_