webkit/browser/blob/blob_data_handle.h

   1 // Copyright (c) 2013 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 WEBKIT_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
   6 #define WEBKIT_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/supports_user_data.h"
  13 #include "webkit/browser/webkit_storage_browser_export.h"
  14
  15 namespace base {
  16 class SequencedTaskRunner;
  17 }
  18
  19 namespace webkit_blob {
  20
  21 class BlobData;
  22 class BlobStorageContext;
  23
  24 // A scoper object for use in chrome's main browser process, ensures
  25 // the underlying BlobData and its uuid remain in BlobStorageContext's
  26 // collection for the duration. This object has delete semantics and
  27 // maybe deleted on any thread.
  28 class WEBKIT_STORAGE_BROWSER_EXPORT BlobDataHandle
  29     : public base::SupportsUserData::Data {
  30  public:
  31   virtual ~BlobDataHandle();  // Maybe be deleted on any thread.
  32   BlobData* data() const;  // May only be accessed on the IO thread.
  33
  34  private:
  35   friend class BlobStorageContext;
  36   BlobDataHandle(BlobData* blob_data, BlobStorageContext* context,
  37                  base::SequencedTaskRunner* task_runner);
  38
  39   static void DeleteHelper(
  40       base::WeakPtr<BlobStorageContext> context,
  41       BlobData* blob_data);
  42
  43   BlobData* blob_data_;  // Intentionally a raw ptr to a non-thread-safe ref.
  44   base::WeakPtr<BlobStorageContext> context_;
  45   scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
  46 };
  47
  48 }  // namespace webkit_blob
  49
  50 #endif  // WEBKIT_BROWSER_BLOB_BLOB_DATA_HANDLE_H_