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1 // Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_FILE_READER_H_ | |
6 #define CHROME_BROWSER_EXTENSIONS_FILE_READER_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/callback.h" | |
11 #include "base/memory/ref_counted.h" | |
12 #include "chrome/common/extensions/extension_resource.h" | |
13 | |
14 class MessageLoop; | |
15 | |
16 // This file defines an interface for reading a file asynchronously on a | |
17 // background thread. | |
18 // Consider abstracting out a FilePathProvider (ExtensionResource) and moving | |
19 // back to chrome/browser/net if other subsystems want to use it. | |
20 class FileReader : public base::RefCountedThreadSafe<FileReader> { | |
21 public: | |
22 // Reports success or failure and the data of the file upon success. | |
23 typedef base::Callback<void(bool, const std::string&)> Callback; | |
24 | |
25 FileReader(const ExtensionResource& resource, const Callback& callback); | |
26 | |
27 // Called to start reading the file on a background thread. Upon completion, | |
28 // the callback will be notified of the results. | |
29 void Start(); | |
30 | |
31 private: | |
32 friend class base::RefCountedThreadSafe<FileReader>; | |
33 | |
34 virtual ~FileReader(); | |
35 | |
36 void ReadFileOnBackgroundThread(); | |
37 | |
38 ExtensionResource resource_; | |
39 Callback callback_; | |
40 MessageLoop* origin_loop_; | |
41 }; | |
42 | |
43 #endif // CHROME_BROWSER_EXTENSIONS_FILE_READER_H_ | |
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