storage/browser/fileapi/timed_task_helper.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 STORAGE_BROWSER_FILEAPI_TIMED_TASK_HELPER_H_
   6 #define STORAGE_BROWSER_FILEAPI_TIMED_TASK_HELPER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/location.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/time/time.h"
  14 #include "storage/browser/storage_browser_export.h"
  15
  16 namespace base {
  17 class SequencedTaskRunner;
  18 }
  19
  20 namespace storage {
  21
  22 // Works similarly as base::Timer, but takes SequencedTaskRunner and
  23 // runs tasks on it (instead of implicitly bound to a thread).
  24 // TODO(kinuko): This has nothing to do with fileapi. Move somewhere
  25 // more common place.
  26 class STORAGE_EXPORT TimedTaskHelper {
  27  public:
  28   explicit TimedTaskHelper(base::SequencedTaskRunner* task_runner);
  29   ~TimedTaskHelper();
  30
  31   bool IsRunning() const;
  32   void Start(const tracked_objects::Location& posted_from,
  33              base::TimeDelta delay,
  34              const base::Closure& user_task);
  35   void Reset();
  36
  37  private:
  38   struct Tracker;
  39   static void Fired(scoped_ptr<Tracker> tracker);
  40
  41   void OnFired(scoped_ptr<Tracker> tracker);
  42   void PostDelayedTask(scoped_ptr<Tracker> tracker, base::TimeDelta delay);
  43
  44   scoped_refptr<base::SequencedTaskRunner> task_runner_;
  45   tracked_objects::Location posted_from_;
  46   base::TimeDelta delay_;
  47   base::Closure user_task_;
  48
  49   base::TimeTicks desired_run_time_;
  50
  51   // This is set to non-null and owned by a timer task while timer is running.
  52   Tracker* tracker_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(TimedTaskHelper);
  55 };
  56
  57 }  // namespace storage
  58
  59 #endif  // STORAGE_BROWSER_FILEAPI_TIMED_TASK_HELPER_H_