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 "base/threading/thread_checker.h"
  15 #include "chrome/browser/chromeos/drive/file_errors.h"
  16 #include "google_apis/drive/drive_api_error_codes.h"
  17
  18 namespace base {
  19 class SequencedTaskRunner;
  20 }  // namespace base
  21
  22 namespace google_apis {
  23 class FileResource;
  24 }  // namespace google_apis
  25
  26 namespace drive {
  27
  28 class FileChange;
  29 class JobScheduler;
  30 class ResourceEntry;
  31 struct ClientContext;
  32
  33 namespace file_system {
  34 class OperationDelegate;
  35 }  // namespace file_system
  36
  37 namespace internal {
  38
  39 class ResourceMetadata;
  40
  41 // This class is responsible to revert local changes of an entry.
  42 class EntryRevertPerformer {
  43  public:
  44   EntryRevertPerformer(base::SequencedTaskRunner* blocking_task_runner,
  45                        file_system::OperationDelegate* delegate,
  46                        JobScheduler* scheduler,
  47                        ResourceMetadata* metadata);
  48   ~EntryRevertPerformer();
  49
  50   // Requests the server for metadata of the entry specified by |local_id|
  51   // and overwrites the locally stored entry with it.
  52   // Invokes |callback| when finished with the result of the operation.
  53   // |callback| must not be null.
  54   void RevertEntry(const std::string& local_id,
  55                    const ClientContext& context,
  56                    const FileOperationCallback& callback);
  57
  58  private:
  59   // Part of RevertEntry(). Called after local metadata look up.
  60   void RevertEntryAfterPrepare(const ClientContext& context,
  61                                const FileOperationCallback& callback,
  62                                scoped_ptr<ResourceEntry> entry,
  63                                FileError error);
  64
  65   // Part of RevertEntry(). Called after GetFileResource is completed.
  66   void RevertEntryAfterGetFileResource(
  67       const FileOperationCallback& callback,
  68       const std::string& local_id,
  69       google_apis::DriveApiErrorCode status,
  70       scoped_ptr<google_apis::FileResource> entry);
  71
  72   // Part of RevertEntry(). Called after local metadata is updated.
  73   void RevertEntryAfterFinishRevert(const FileOperationCallback& callback,
  74                                     const FileChange* changed_files,
  75                                     FileError error);
  76
  77   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
  78   file_system::OperationDelegate* delegate_;
  79   JobScheduler* scheduler_;
  80   ResourceMetadata* metadata_;
  81
  82   base::ThreadChecker thread_checker_;
  83
  84   // Note: This should remain the last member so it'll be destroyed and
  85   // invalidate the weak pointers before any other members are destroyed.
  86   base::WeakPtrFactory<EntryRevertPerformer> weak_ptr_factory_;
  87   DISALLOW_COPY_AND_ASSIGN(EntryRevertPerformer);
  88 };
  89
  90 }  // namespace internal
  91 }  // namespace drive
  92
  93 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_SYNC_ENTRY_REVERT_PERFORMER_H_