content/browser/renderer_host/input/timeout_monitor.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 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
  14 namespace content {
  15
  16 // Utility class for handling a timeout callback with periodic starts and stops.
  17 class 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 StartImpl(base::TimeDelta delay);
  35   void CheckTimedOut();
  36
  37   TimeoutHandler timeout_handler_;
  38
  39   // Indicates a time in the future when we would consider the input as
  40   // having timed out, if it does not receive an appropriate stop request.
  41   base::TimeTicks time_when_considered_timed_out_;
  42
  43   // This timer runs to check if |time_when_considered_timed_out_| has past.
  44   base::OneShotTimer<TimeoutMonitor> timeout_timer_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(TimeoutMonitor);
  47 };
  48
  49 }  // namespace content
  50
  51 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TIMEOUT_MONITOR_H_