1 // Copyright 2014 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.
5 #ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
6 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
8 #include "base/basictypes.h"
9 #include "base/files/file.h"
10 #include "base/files/file_path.h"
11 #include "base/memory/ref_counted.h"
12 #include "base/memory/weak_ptr.h"
13 #include "storage/browser/fileapi/file_stream_writer.h"
14 #include "storage/browser/fileapi/file_system_url.h"
17 namespace file_system_provider {
19 class ProvidedFileSystemInterface;
21 // Implements a streamed file writer. It is lazily initialized by the first call
23 class FileStreamWriter : public storage::FileStreamWriter {
25 FileStreamWriter(const storage::FileSystemURL& url, int64 initial_offset);
27 virtual ~FileStreamWriter();
29 // storage::FileStreamWriter overrides.
30 virtual int Write(net::IOBuffer* buf,
32 const net::CompletionCallback& callback) override;
33 virtual int Cancel(const net::CompletionCallback& callback) override;
34 virtual int Flush(const net::CompletionCallback& callback) override;
37 // Helper class for executing operations on the provided file system. All
38 // of its methods must be called on UI thread. Callbacks are called on IO
40 class OperationRunner;
42 // State of the file stream writer.
43 enum State { NOT_INITIALIZED, INITIALIZING, INITIALIZED, FAILED };
45 // Called when OperationRunner::WriteOnUIThread is completed.
46 void OnWriteFileCompleted(int buffer_length,
47 const net::CompletionCallback& callback,
48 base::File::Error result);
50 // Called when Write() operation is completed with either a success or an
52 void OnWriteCompleted(net::CompletionCallback callback, int result);
54 // Called when Abort() operation is completed with either a success or an
56 void OnAbortCompleted(const net::CompletionCallback& callback,
57 base::File::Error result);
59 // Initializes the writer by opening the file. When completed with success,
60 // runs the |pending_closure|. Otherwise, calls the |error_callback|.
61 void Initialize(const base::Closure& pending_closure,
62 const net::CompletionCallback& error_callback);
64 // Called when opening a file is completed with either a success or an error.
65 void OnOpenFileCompleted(
66 const base::Closure& pending_closure,
67 const net::CompletionCallback& error_callback,
68 base::File::Error result);
70 // Same as Write(), but called after initializing is completed.
71 void WriteAfterInitialized(scoped_refptr<net::IOBuffer> buffer,
73 const net::CompletionCallback& callback);
75 storage::FileSystemURL url_;
76 int64 current_offset_;
77 scoped_refptr<OperationRunner> runner_;
80 base::WeakPtrFactory<FileStreamWriter> weak_ptr_factory_;
81 DISALLOW_COPY_AND_ASSIGN(FileStreamWriter);
84 } // namespace file_system_provider
85 } // namespace chromeos
87 #endif // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_