Upstream version 10.39.225.0
[platform/framework/web/crosswalk.git] / src / 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_