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 base {
  14 class FilePath;
  15 class Time;
  16 }
  17
  18 namespace storage {
  19 class BlobStorageContext;
  20 }
  21
  22 namespace content {
  23 class BlobHandle;
  24 class BrowserContext;
  25 struct ChromeBlobStorageContextDeleter;
  26
  27 // A context class that keeps track of BlobStorageController used by the chrome.
  28 // There is an instance associated with each BrowserContext. There could be
  29 // multiple URLRequestContexts in the same browser context that refers to the
  30 // same instance.
  31 //
  32 // All methods, except the ctor, are expected to be called on
  33 // the IO thread (unless specifically called out in doc comments).
  34 class CONTENT_EXPORT ChromeBlobStorageContext
  35     : public base::RefCountedThreadSafe<ChromeBlobStorageContext,
  36                                         ChromeBlobStorageContextDeleter> {
  37  public:
  38   ChromeBlobStorageContext();
  39
  40   static ChromeBlobStorageContext* GetFor(
  41       BrowserContext* browser_context);
  42
  43   void InitializeOnIOThread();
  44
  45   storage::BlobStorageContext* context() const { return context_.get(); }
  46
  47   // Returns a NULL scoped_ptr on failure.
  48   scoped_ptr<BlobHandle> CreateMemoryBackedBlob(const char* data,
  49                                                 size_t length);
  50
  51   // Returns a NULL scoped_ptr on failure.
  52   scoped_ptr<BlobHandle> CreateFileBackedBlob(
  53       const base::FilePath& path,
  54       int64_t offset,
  55       int64_t size,
  56       const base::Time& expected_modification_time);
  57
  58  protected:
  59   virtual ~ChromeBlobStorageContext();
  60
  61  private:
  62   friend class base::DeleteHelper<ChromeBlobStorageContext>;
  63   friend class base::RefCountedThreadSafe<ChromeBlobStorageContext,
  64                                           ChromeBlobStorageContextDeleter>;
  65   friend struct ChromeBlobStorageContextDeleter;
  66
  67   void DeleteOnCorrectThread() const;
  68
  69   scoped_ptr<storage::BlobStorageContext> context_;
  70 };
  71
  72 struct ChromeBlobStorageContextDeleter {
  73   static void Destruct(const ChromeBlobStorageContext* context) {
  74     context->DeleteOnCorrectThread();
  75   }
  76 };
  77
  78 }  // namespace content
  79
  80 #endif  // CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_