chrome/browser/chromeos/drive/sync/entry_revert_performer.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_SYNC_ENTRY_REVERT_PERFORMER_H_
   6 #define CHROME_BROWSER_CHROMEOS_DRIVE_SYNC_ENTRY_REVERT_PERFORMER_H_
   7
   8 #include <set>
   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 "google_apis/drive/gdata_errorcode.h"
  16
  17 namespace base {
  18 class SequencedTaskRunner;
  19 }  // namespace base
  20
  21 namespace google_apis {
  22 class ResourceEntry;
  23 }  // namespace google_apis
  24
  25 namespace drive {
  26
  27 class JobScheduler;
  28 class ResourceEntry;
  29
  30 namespace file_system {
  31 class OperationObserver;
  32 }  // namespace file_system
  33
  34 namespace internal {
  35
  36 class ResourceMetadata;
  37
  38 // This class is responsible to revert local changes of an entry.
  39 class EntryRevertPerformer {
  40  public:
  41   EntryRevertPerformer(base::SequencedTaskRunner* blocking_task_runner,
  42                        file_system::OperationObserver* observer,
  43                        JobScheduler* scheduler,
  44                        ResourceMetadata* metadata);
  45   ~EntryRevertPerformer();
  46
  47   // Requests the server for metadata of the entry specified by |local_id|
  48   // and overwrites the locally stored entry with it.
  49   // Invokes |callback| when finished with the result of the operation.
  50   // |callback| must not be null.
  51   void RevertEntry(const std::string& local_id,
  52                    const FileOperationCallback& callback);
  53
  54  private:
  55   // Part of RevertEntry(). Called after local metadata look up.
  56   void RevertEntryAfterPrepare(const FileOperationCallback& callback,
  57                                scoped_ptr<ResourceEntry> entry,
  58                                FileError error);
  59
  60   // Part of RevertEntry(). Called after GetResourceEntry is completed.
  61   void RevertEntryAfterGetResourceEntry(
  62       const FileOperationCallback& callback,
  63       const std::string& local_id,
  64       google_apis::GDataErrorCode status,
  65       scoped_ptr<google_apis::ResourceEntry> resource_entry);
  66
  67   // Part of RevertEntry(). Called after local metadata is updated.
  68   void RevertEntryAfterFinishRevert(
  69       const FileOperationCallback& callback,
  70       const std::set<base::FilePath>* changed_directories,
  71       FileError error);
  72
  73   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
  74   file_system::OperationObserver* observer_;
  75   JobScheduler* scheduler_;
  76   ResourceMetadata* metadata_;
  77
  78   // Note: This should remain the last member so it'll be destroyed and
  79   // invalidate the weak pointers before any other members are destroyed.
  80   base::WeakPtrFactory<EntryRevertPerformer> weak_ptr_factory_;
  81   DISALLOW_COPY_AND_ASSIGN(EntryRevertPerformer);
  82 };
  83
  84 }  // namespace internal
  85 }  // namespace drive
  86
  87 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_SYNC_ENTRY_REVERT_PERFORMER_H_