chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.h

   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.
   4
   5 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_FILEAPI_WEBKIT_FILE_STREAM_WRITER_IMPL_H_
   6 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILEAPI_WEBKIT_FILE_STREAM_WRITER_IMPL_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/files/file.h"
  11 #include "base/files/file_path.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "storage/browser/fileapi/file_stream_writer.h"
  15
  16 namespace base {
  17 class TaskRunner;
  18 }  // namespace base
  19
  20 namespace net {
  21 class IOBuffer;
  22 }  // namespace net
  23
  24 namespace drive {
  25
  26 class FileSystemInterface;
  27
  28 namespace internal {
  29
  30 // The implementation of storage::FileStreamWriter for the Drive File System.
  31 class WebkitFileStreamWriterImpl : public storage::FileStreamWriter {
  32  public:
  33   // Callback to return the FileSystemInterface instance. This is an
  34   // injecting point for testing.
  35   // Note that the callback will be copied between threads (IO and UI), and
  36   // will be called on UI thread.
  37   typedef base::Callback<FileSystemInterface*()> FileSystemGetter;
  38
  39   // Creates a writer for a file at |file_path| on FileSystem returned by
  40   // |file_system_getter| that starts writing from |offset|.
  41   // When invalid parameters are set, the first call to Write() method fails.
  42   // Uses |file_task_runner| for local file operations.
  43   WebkitFileStreamWriterImpl(const FileSystemGetter& file_system_getter,
  44                              base::TaskRunner* file_task_runner,
  45                              const base::FilePath& file_path,
  46                              int64 offset);
  47   ~WebkitFileStreamWriterImpl() override;
  48
  49   // FileWriter override.
  50   int Write(net::IOBuffer* buf,
  51             int buf_len,
  52             const net::CompletionCallback& callback) override;
  53   int Cancel(const net::CompletionCallback& callback) override;
  54   int Flush(const net::CompletionCallback& callback) override;
  55
  56  private:
  57   // Part of Write(). Called after CreateWritableSnapshotFile is completed.
  58   void WriteAfterCreateWritableSnapshotFile(
  59       net::IOBuffer* buf,
  60       int buf_len,
  61       base::File::Error open_result,
  62       const base::FilePath& local_path,
  63       const base::Closure& close_callback_on_ui_thread);
  64
  65   FileSystemGetter file_system_getter_;
  66   scoped_refptr<base::TaskRunner> file_task_runner_;
  67   const base::FilePath file_path_;
  68   const int64 offset_;
  69
  70   scoped_ptr<storage::FileStreamWriter> local_file_writer_;
  71   base::Closure close_callback_on_ui_thread_;
  72   net::CompletionCallback pending_write_callback_;
  73   net::CompletionCallback pending_cancel_callback_;
  74
  75   // Note: This should remain the last member so it'll be destroyed and
  76   // invalidate the weak pointers before any other members are destroyed.
  77   base::WeakPtrFactory<WebkitFileStreamWriterImpl> weak_ptr_factory_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(WebkitFileStreamWriterImpl);
  80 };
  81
  82 }  // namespace internal
  83 }  // namespace drive
  84
  85 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILEAPI_WEBKIT_FILE_STREAM_WRITER_IMPL_H_