components/scheduler/renderer/deadline_task_runner.cc

   1 // Copyright 2015 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 #include "components/scheduler/renderer/deadline_task_runner.h"
   6
   7 #include "base/bind.h"
   8
   9 namespace scheduler {
  10
  11 DeadlineTaskRunner::DeadlineTaskRunner(
  12     const base::Closure& callback,
  13     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
  14     : callback_(callback), task_runner_(task_runner) {
  15   cancelable_run_internal_.Reset(
  16       base::Bind(&DeadlineTaskRunner::RunInternal, base::Unretained(this)));
  17 }
  18
  19 DeadlineTaskRunner::~DeadlineTaskRunner() {
  20 }
  21
  22 void DeadlineTaskRunner::SetDeadline(const tracked_objects::Location& from_here,
  23                                      base::TimeDelta delay,
  24                                      base::TimeTicks now) {
  25   DCHECK(delay > base::TimeDelta());
  26   base::TimeTicks deadline = now + delay;
  27   if (deadline_.is_null() || deadline < deadline_) {
  28     deadline_ = deadline;
  29     cancelable_run_internal_.Cancel();
  30     task_runner_->PostDelayedTask(from_here,
  31                                   cancelable_run_internal_.callback(), delay);
  32   }
  33 }
  34
  35 void DeadlineTaskRunner::RunInternal() {
  36   deadline_ = base::TimeTicks();
  37   callback_.Run();
  38 }
  39
  40 }  // namespace scheduler