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      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_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
      6 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
      7 
      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"
     15 
     16 namespace chromeos {
     17 namespace file_system_provider {
     18 
     19 class ProvidedFileSystemInterface;
     20 
     21 // Implements a streamed file writer. It is lazily initialized by the first call
     22 // to Write().
     23 class FileStreamWriter : public storage::FileStreamWriter {
     24  public:
     25   FileStreamWriter(const storage::FileSystemURL& url, int64 initial_offset);
     26 
     27   virtual ~FileStreamWriter();
     28 
     29   // storage::FileStreamWriter overrides.
     30   virtual int Write(net::IOBuffer* buf,
     31                     int buf_len,
     32                     const net::CompletionCallback& callback) OVERRIDE;
     33   virtual int Cancel(const net::CompletionCallback& callback) OVERRIDE;
     34   virtual int Flush(const net::CompletionCallback& callback) OVERRIDE;
     35 
     36  private:
     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
     39   // thread.
     40   class OperationRunner;
     41 
     42   // State of the file stream writer.
     43   enum State { NOT_INITIALIZED, INITIALIZING, INITIALIZED, FAILED };
     44 
     45   // Called when OperationRunner::WriteOnUIThread is completed.
     46   void OnWriteFileCompleted(int buffer_length,
     47                             const net::CompletionCallback& callback,
     48                             base::File::Error result);
     49 
     50   // Called when Write() operation is completed with either a success or an
     51   // error.
     52   void OnWriteCompleted(net::CompletionCallback callback, int result);
     53 
     54   // Called when Abort() operation is completed with either a success or an
     55   // error.
     56   void OnAbortCompleted(const net::CompletionCallback& callback,
     57                         base::File::Error result);
     58 
     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);
     63 
     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);
     69 
     70   // Same as Write(), but called after initializing is completed.
     71   void WriteAfterInitialized(scoped_refptr<net::IOBuffer> buffer,
     72                              int buffer_length,
     73                              const net::CompletionCallback& callback);
     74 
     75   storage::FileSystemURL url_;
     76   int64 current_offset_;
     77   scoped_refptr<OperationRunner> runner_;
     78   State state_;
     79 
     80   base::WeakPtrFactory<FileStreamWriter> weak_ptr_factory_;
     81   DISALLOW_COPY_AND_ASSIGN(FileStreamWriter);
     82 };
     83 
     84 }  // namespace file_system_provider
     85 }  // namespace chromeos
     86 
     87 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
     88