| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef EXTENSIONS_BROWSER_FILE_READER_H_ |
| #define EXTENSIONS_BROWSER_FILE_READER_H_ |
| |
| #include <string> |
| |
| #include "base/callback.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/single_thread_task_runner.h" |
| #include "extensions/common/extension_resource.h" |
| |
| // This file defines an interface for reading a file asynchronously on a |
| // background sequence. |
| // Consider abstracting out a FilePathProvider (ExtensionResource) and moving |
| // back to chrome/browser/net if other subsystems want to use it. |
| class FileReader : public base::RefCountedThreadSafe<FileReader> { |
| public: |
| // Reports success or failure and the data of the file upon success. |
| using DoneCallback = |
| base::OnceCallback<void(bool, std::unique_ptr<std::string>)>; |
| // Lets the caller accomplish tasks on the file data, after the file content |
| // has been read. |
| // If the file reading doesn't succeed, this will be ignored. |
| using OptionalFileSequenceTask = base::OnceCallback<void(std::string*)>; |
| |
| FileReader(const extensions::ExtensionResource& resource, |
| OptionalFileSequenceTask file_sequence_task, |
| DoneCallback done_callback); |
| |
| // Called to start reading the file on a background sequence. Upon completion, |
| // the callback will be notified of the results. |
| void Start(); |
| |
| private: |
| friend class base::RefCountedThreadSafe<FileReader>; |
| |
| ~FileReader(); |
| |
| void ReadFileOnFileSequence(); |
| |
| extensions::ExtensionResource resource_; |
| OptionalFileSequenceTask optional_file_sequence_task_; |
| DoneCallback done_callback_; |
| const scoped_refptr<base::SingleThreadTaskRunner> origin_task_runner_; |
| |
| DISALLOW_COPY_AND_ASSIGN(FileReader); |
| }; |
| |
| #endif // EXTENSIONS_BROWSER_FILE_READER_H_ |