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// Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_FILE_READER_H_
#define CHROME_BROWSER_EXTENSIONS_FILE_READER_H_
#pragma once
#include <string>
#include "base/callback.h"
#include "base/ref_counted.h"
#include "chrome/common/extensions/extension_resource.h"
class MessageLoop;
// This file defines an interface for reading a file asynchronously on a
// background thread.
// 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.
typedef Callback2<bool, const std::string&>::Type Callback;
FileReader(const ExtensionResource& resource, Callback* callback);
// Called to start reading the file on a background thread. Upon completion,
// the callback will be notified of the results.
void Start();
private:
friend class base::RefCountedThreadSafe<FileReader>;
~FileReader() {}
void ReadFileOnBackgroundThread();
void RunCallback(bool success, const std::string& data);
ExtensionResource resource_;
Callback* callback_;
MessageLoop* origin_loop_;
};
#endif // CHROME_BROWSER_EXTENSIONS_FILE_READER_H_
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