OLD | NEW |
(Empty) | |
| 1 // Copyright 2017 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/policy/core/common/policy_scheduler.h" |
| 6 |
| 7 #include "base/memory/ptr_util.h" |
| 8 #include "base/threading/thread_task_runner_handle.h" |
| 9 |
| 10 namespace policy { |
| 11 |
| 12 PolicyScheduler::PolicyScheduler(Task task, |
| 13 SchedulerCallback callback, |
| 14 base::TimeDelta interval) |
| 15 : task_(task), callback_(callback), interval_(interval) { |
| 16 ScheduleTaskNow(); |
| 17 } |
| 18 |
| 19 PolicyScheduler::~PolicyScheduler() { |
| 20 DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| 21 } |
| 22 |
| 23 void PolicyScheduler::ScheduleTaskNow() { |
| 24 DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| 25 ScheduleDelayedTask(base::TimeDelta()); |
| 26 } |
| 27 |
| 28 void PolicyScheduler::ScheduleDelayedTask(base::TimeDelta delay) { |
| 29 DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| 30 |
| 31 if (job_) { |
| 32 job_->Cancel(); |
| 33 } |
| 34 job_ = base::MakeUnique<base::CancelableClosure>(base::Bind( |
| 35 &PolicyScheduler::RunScheduledTask, weak_ptr_factory_.GetWeakPtr())); |
| 36 base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(FROM_HERE, |
| 37 job_->callback(), delay); |
| 38 } |
| 39 |
| 40 void PolicyScheduler::ScheduleNextTask() { |
| 41 DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| 42 |
| 43 base::TimeDelta interval = overlap_ ? base::TimeDelta() : interval_; |
| 44 const base::TimeTicks now(base::TimeTicks::Now()); |
| 45 // Time uses saturated arithmetics thus no under/overflow possible. |
| 46 const base::TimeDelta delay = last_task_ + interval - now; |
| 47 // Clamping delay to non-negative values just to be on the safe side. |
| 48 ScheduleDelayedTask(std::max(base::TimeDelta(), delay)); |
| 49 } |
| 50 |
| 51 void PolicyScheduler::RunScheduledTask() { |
| 52 DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| 53 |
| 54 if (task_in_progress_) { |
| 55 overlap_ = true; |
| 56 return; |
| 57 } |
| 58 |
| 59 overlap_ = false; |
| 60 task_in_progress_ = true; |
| 61 task_.Run(base::BindOnce(&PolicyScheduler::OnTaskDone, |
| 62 weak_ptr_factory_.GetWeakPtr())); |
| 63 } |
| 64 |
| 65 void PolicyScheduler::OnTaskDone(bool success) { |
| 66 DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| 67 |
| 68 task_in_progress_ = false; |
| 69 last_task_ = base::TimeTicks::Now(); |
| 70 callback_.Run(success); |
| 71 ScheduleNextTask(); |
| 72 } |
| 73 |
| 74 } // namespace policy |
OLD | NEW |