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 CONTENT_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_
6#define CONTENT_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_
7
8#include "base/basictypes.h"
9#include "base/callback.h"
10#include "base/time/time.h"
11#include "base/timer/timer.h"
12#include "content/common/content_export.h"
13
14namespace content {
15
16// Utility class for handling a timeout callback with periodic starts and stops.
17class CONTENT_EXPORT TimeoutMonitor {
18 public:
19  typedef base::Closure TimeoutHandler;
20
21  explicit TimeoutMonitor(const TimeoutHandler& timeout_handler);
22  ~TimeoutMonitor();
23
24  // Schedule the timeout timer to fire at |delay| into the future. If a timeout
25  // has already been scheduled, reschedule only if |delay| is sooner than the
26  // currently scheduled timeout time.
27  void Start(base::TimeDelta delay);
28
29  void Restart(base::TimeDelta delay);
30  void Stop();
31  bool IsRunning() const;
32
33 private:
34  void CheckTimedOut();
35
36  TimeoutHandler timeout_handler_;
37
38  // Indicates a time in the future when we would consider the input as
39  // having timed out, if it does not receive an appropriate stop request.
40  base::Time time_when_considered_timed_out_;
41
42  // This timer runs to check if |time_when_considered_timed_out_| has past.
43  base::OneShotTimer<TimeoutMonitor> timeout_timer_;
44
45  DISALLOW_COPY_AND_ASSIGN(TimeoutMonitor);
46};
47
48}  // namespace content
49
50#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_
51