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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
#define CHROME_BROWSER_ASH_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
#include <stdint.h>
#include "base/files/file.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "net/base/completion_once_callback.h"
#include "storage/browser/file_system/file_stream_writer.h"
#include "storage/browser/file_system/file_system_url.h"
namespace ash::file_system_provider {
// Implements a streamed file writer. It is lazily initialized by the first call
// to Write().
class FileStreamWriter : public storage::FileStreamWriter {
public:
FileStreamWriter(const storage::FileSystemURL& url, int64_t initial_offset);
FileStreamWriter(const FileStreamWriter&) = delete;
FileStreamWriter& operator=(const FileStreamWriter&) = delete;
~FileStreamWriter() override;
// storage::FileStreamWriter overrides.
int Write(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) override;
int Cancel(net::CompletionOnceCallback callback) override;
int Flush(storage::FlushMode flush_mode,
net::CompletionOnceCallback callback) override;
private:
// Helper class for executing operations on the provided file system. All
// of its methods must be called on UI thread. Callbacks are called on IO
// thread.
class OperationRunner;
// State of the file stream writer.
enum State {
NOT_INITIALIZED,
INITIALIZING,
INITIALIZED,
EXECUTING,
FAILED,
CANCELLING,
FINALIZED,
};
// Called when OperationRunner::WriteOnUIThread is completed.
void OnWriteFileCompleted(int buffer_length,
net::CompletionOnceCallback callback,
base::File::Error result);
// Called when Write() operation is completed with either a success or an
// error.
void OnWriteCompleted(int result);
void OnFlushFileCompleted(net::CompletionOnceCallback callback,
base::File::Error result);
// Initializes the writer by opening the file. When completed with success,
// runs the |pending_closure|. Otherwise, calls the |error_callback|.
void Initialize(base::OnceClosure pending_closure,
net::CompletionOnceCallback error_callback);
// Called when opening a file is completed with either a success or an error.
void OnOpenFileCompleted(base::OnceClosure pending_closure,
net::CompletionOnceCallback error_callback,
base::File::Error result);
// Same as Write(), but called after initializing is completed.
void WriteAfterInitialized(scoped_refptr<net::IOBuffer> buffer,
int buffer_length,
net::CompletionOnceCallback callback);
net::CompletionOnceCallback write_callback_;
storage::FileSystemURL url_;
int64_t current_offset_;
scoped_refptr<OperationRunner> runner_;
State state_;
base::WeakPtrFactory<FileStreamWriter> weak_ptr_factory_{this};
};
} // namespace ash::file_system_provider
#endif // CHROME_BROWSER_ASH_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
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