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// Copyright 2013 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_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_WRITER_IMPL_H_
#define CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_WRITER_IMPL_H_
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/platform_file.h"
#include "webkit/browser/fileapi/file_stream_writer.h"
namespace base {
class FilePath;
class TaskRunner;
} // namespace base
namespace net {
class IOBuffer;
} // namespace net
namespace drive {
class FileSystemInterface;
namespace internal {
// The implementation of fileapi::FileStreamWriter for the Drive File System.
class WebkitFileStreamWriterImpl : public fileapi::FileStreamWriter {
public:
// Callback to return the FileSystemInterface instance. This is an
// injecting point for testing.
// Note that the callback will be copied between threads (IO and UI), and
// will be called on UI thread.
typedef base::Callback<FileSystemInterface*()> FileSystemGetter;
// Creates a writer for a file at |file_path| on FileSystem returned by
// |file_system_getter| that starts writing from |offset|.
// When invalid parameters are set, the first call to Write() method fails.
// Uses |file_task_runner| for local file operations.
WebkitFileStreamWriterImpl(const FileSystemGetter& file_system_getter,
base::TaskRunner* file_task_runner,
const base::FilePath& file_path,
int64 offset);
virtual ~WebkitFileStreamWriterImpl();
// FileWriter override.
virtual int Write(net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) OVERRIDE;
virtual int Cancel(const net::CompletionCallback& callback) OVERRIDE;
virtual int Flush(const net::CompletionCallback& callback) OVERRIDE;
private:
// Part of Write(). Called after CreateWritableSnapshotFile is completed.
void WriteAfterCreateWritableSnapshotFile(
net::IOBuffer* buf,
int buf_len,
base::PlatformFileError open_result,
const base::FilePath& local_path,
const base::Closure& close_callback_on_ui_thread);
FileSystemGetter file_system_getter_;
scoped_refptr<base::TaskRunner> file_task_runner_;
const base::FilePath file_path_;
const int64 offset_;
scoped_ptr<fileapi::FileStreamWriter> local_file_writer_;
base::Closure close_callback_on_ui_thread_;
net::CompletionCallback pending_write_callback_;
net::CompletionCallback pending_cancel_callback_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate the weak pointers before any other members are destroyed.
base::WeakPtrFactory<WebkitFileStreamWriterImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(WebkitFileStreamWriterImpl);
};
} // namespace internal
} // namespace drive
#endif // CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_WRITER_IMPL_H_
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