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
16namespace base {
17class SequencedTaskRunner;
18}
19
20namespace 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.
26class 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_
60