src/chrome/browser/chromeos/drive/file_system/open_file_operation.h

   1 // Copyright 2013 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_FILE_SYSTEM_OPEN_FILE_OPERATION_H_
   6 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OPEN_FILE_OPERATION_H_
   7
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "chrome/browser/chromeos/drive/file_errors.h"
  15 #include "chrome/browser/chromeos/drive/file_system_interface.h"
  16
  17 namespace base {
  18 class FilePath;
  19 class ScopedClosureRunner;
  20 class SequencedTaskRunner;
  21 }  // namespace base
  22
  23 namespace drive {
  24
  25 class JobScheduler;
  26 class ResourceEntry;
  27
  28 namespace internal {
  29 class ResourceMetadata;
  30 class FileCache;
  31 }  // namespace internal
  32
  33 namespace file_system {
  34
  35 class CreateFileOperation;
  36 class DownloadOperation;
  37 class OperationDelegate;
  38
  39 class OpenFileOperation {
  40  public:
  41   OpenFileOperation(base::SequencedTaskRunner* blocking_task_runner,
  42                     OperationDelegate* delegate,
  43                     JobScheduler* scheduler,
  44                     internal::ResourceMetadata* metadata,
  45                     internal::FileCache* cache,
  46                     const base::FilePath& temporary_file_directory);
  47   ~OpenFileOperation();
  48
  49   // Opens the file at |file_path|.
  50   // If the file is not actually downloaded, this method starts
  51   // to download it to the cache, and then runs |callback| upon the
  52   // completion with the path to the local cache file.
  53   // See also the definition of OpenMode for its meaning.
  54   // If |mime_type| is non empty and the file is created by this OpenFile()
  55   // call, the mime type is used as the file's property.
  56   // |callback| must not be null.
  57   void OpenFile(const base::FilePath& file_path,
  58                 OpenMode open_mode,
  59                 const std::string& mime_type,
  60                 const OpenFileCallback& callback);
  61
  62  private:
  63   // Part of OpenFile(). Called after file creation is completed.
  64   void OpenFileAfterCreateFile(const base::FilePath& file_path,
  65                                const OpenFileCallback& callback,
  66                                FileError error);
  67
  68   // Part of OpenFile(). Called after file downloading is completed.
  69   void OpenFileAfterFileDownloaded(const OpenFileCallback& callback,
  70                                    FileError error,
  71                                    const base::FilePath& local_file_path,
  72                                    scoped_ptr<ResourceEntry> entry);
  73
  74   // Part of OpenFile(). Called after opening the cache file.
  75   void OpenFileAfterOpenForWrite(
  76       const base::FilePath& local_file_path,
  77       const std::string& local_id,
  78       const OpenFileCallback& callback,
  79       scoped_ptr<base::ScopedClosureRunner>* file_closer,
  80       FileError error);
  81
  82   // Closes the file with |local_id|.
  83   void CloseFile(const std::string& local_id,
  84                  scoped_ptr<base::ScopedClosureRunner> file_closer);
  85
  86   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
  87   OperationDelegate* delegate_;
  88   internal::FileCache* cache_;
  89
  90   scoped_ptr<CreateFileOperation> create_file_operation_;
  91   scoped_ptr<DownloadOperation> download_operation_;
  92
  93   // The map from local id for an opened file to the number how many times
  94   // the file is opened.
  95   std::map<std::string, int> open_files_;
  96
  97   // Note: This should remain the last member so it'll be destroyed and
  98   // invalidate its weak pointers before any other members are destroyed.
  99   base::WeakPtrFactory<OpenFileOperation> weak_ptr_factory_;
 100   DISALLOW_COPY_AND_ASSIGN(OpenFileOperation);
 101 };
 102
 103 }  // namespace file_system
 104 }  // namespace drive
 105
 106 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OPEN_FILE_OPERATION_H_