storage/browser/fileapi/file_system_file_stream_reader.h

   1 // Copyright (c) 2012 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 STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
   6 #define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
   7
   8 #include "base/bind.h"
   9 #include "base/files/file.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/time/time.h"
  12 #include "storage/browser/blob/shareable_file_reference.h"
  13 #include "storage/browser/fileapi/file_stream_reader.h"
  14 #include "storage/browser/fileapi/file_system_url.h"
  15 #include "storage/browser/storage_browser_export.h"
  16
  17 namespace base {
  18 class FilePath;
  19 class SequencedTaskRunner;
  20 }
  21
  22 namespace content {
  23 class FileSystemFileStreamReaderTest;
  24 }
  25
  26 namespace storage {
  27
  28 class FileSystemContext;
  29
  30 // Generic FileStreamReader implementation for FileSystem files.
  31 // Note: This generic implementation would work for any filesystems but
  32 // remote filesystem should implement its own reader rather than relying
  33 // on FileSystemOperation::GetSnapshotFile() which may force downloading
  34 // the entire contents for remote files.
  35 class STORAGE_EXPORT_PRIVATE FileSystemFileStreamReader
  36     : public NON_EXPORTED_BASE(storage::FileStreamReader) {
  37  public:
  38   ~FileSystemFileStreamReader() override;
  39
  40   // FileStreamReader overrides.
  41   int Read(net::IOBuffer* buf,
  42            int buf_len,
  43            const net::CompletionCallback& callback) override;
  44   int64 GetLength(const net::Int64CompletionCallback& callback) override;
  45
  46  private:
  47   friend class storage::FileStreamReader;
  48   friend class content::FileSystemFileStreamReaderTest;
  49
  50   FileSystemFileStreamReader(FileSystemContext* file_system_context,
  51                              const FileSystemURL& url,
  52                              int64 initial_offset,
  53                              const base::Time& expected_modification_time);
  54
  55   int CreateSnapshot(const base::Closure& callback,
  56                      const net::CompletionCallback& error_callback);
  57   void DidCreateSnapshot(
  58       const base::Closure& callback,
  59       const net::CompletionCallback& error_callback,
  60       base::File::Error file_error,
  61       const base::File::Info& file_info,
  62       const base::FilePath& platform_path,
  63       const scoped_refptr<storage::ShareableFileReference>& file_ref);
  64
  65   scoped_refptr<FileSystemContext> file_system_context_;
  66   FileSystemURL url_;
  67   const int64 initial_offset_;
  68   const base::Time expected_modification_time_;
  69   scoped_ptr<storage::FileStreamReader> local_file_reader_;
  70   scoped_refptr<storage::ShareableFileReference> snapshot_ref_;
  71   bool has_pending_create_snapshot_;
  72   base::WeakPtrFactory<FileSystemFileStreamReader> weak_factory_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(FileSystemFileStreamReader);
  75 };
  76
  77 }  // namespace storage
  78
  79 #endif  // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_