chrome/browser/sync_file_system/drive_backend/callback_tracker_internal.h

   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_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CALLBACK_TRACKER_INTERNAL_H_
   6 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CALLBACK_TRACKER_INTERNAL_H_
   7
   8 #include "base/callback.h"
   9 #include "base/callback_internal.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12
  13 namespace sync_file_system {
  14 namespace drive_backend {
  15
  16 class CallbackTracker;
  17
  18 namespace internal {
  19
  20 class AbortHelper {
  21  public:
  22   explicit AbortHelper(CallbackTracker* tracker);
  23   ~AbortHelper();
  24   base::WeakPtr<AbortHelper> AsWeakPtr();
  25
  26   static scoped_ptr<AbortHelper> TakeOwnership(
  27       const base::WeakPtr<AbortHelper>& abort_helper);
  28
  29  private:
  30   CallbackTracker* tracker_;  // Not owned.
  31   base::WeakPtrFactory<AbortHelper> weak_ptr_factory_;
  32
  33   DISALLOW_COPY_AND_ASSIGN(AbortHelper);
  34 };
  35
  36 template <typename>
  37 struct InvokeAndInvalidateHelper;
  38
  39 template <typename... Args>
  40 struct InvokeAndInvalidateHelper<void(Args...)> {
  41   static void Run(const base::WeakPtr<AbortHelper>& abort_helper,
  42                   const base::Callback<void(Args...)>& callback,
  43                   Args... args) {
  44     scoped_ptr<AbortHelper> deleter = AbortHelper::TakeOwnership(abort_helper);
  45     if (deleter) {
  46       callback.Run(base::internal::CallbackForward(args)...);
  47     }
  48   }
  49 };
  50
  51 }  // namespace internal
  52 }  // namespace drive_backend
  53 }  // namespace sync_file_system
  54
  55 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CALLBACK_TRACKER_INTERNAL_H_