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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "net/quic/quic_chromium_alarm_factory.h"
- #include "base/bind.h"
- #include "base/check.h"
- #include "base/location.h"
- #include "base/memory/raw_ptr.h"
- #include "base/time/tick_clock.h"
- #include "base/time/time.h"
- #include "base/timer/timer.h"
- #include "net/quic/platform/impl/quic_chromium_clock.h"
- namespace net {
- namespace {
- class QuicChromeAlarm : public quic::QuicAlarm, public base::TickClock {
- public:
- QuicChromeAlarm(const quic::QuicClock* clock,
- base::SequencedTaskRunner* task_runner,
- quic::QuicArenaScopedPtr<quic::QuicAlarm::Delegate> delegate)
- : quic::QuicAlarm(std::move(delegate)),
- clock_(clock),
- // Unretained is safe because base::OneShotTimer never runs its task
- // after being deleted.
- on_alarm_callback_(base::BindRepeating(&QuicChromeAlarm::OnAlarm,
- base::Unretained(this))),
- timer_(std::make_unique<base::OneShotTimer>(this)) {
- timer_->SetTaskRunner(task_runner);
- }
- protected:
- void SetImpl() override {
- DCHECK(deadline().IsInitialized());
- const int64_t delay_us = (deadline() - clock_->Now()).ToMicroseconds();
- timer_->Start(FROM_HERE, base::Microseconds(delay_us), on_alarm_callback_);
- }
- void CancelImpl() override {
- DCHECK(!deadline().IsInitialized());
- timer_->Stop();
- }
- private:
- void OnAlarm() {
- DCHECK(deadline().IsInitialized());
- // In tests, the time source used by the scheduler may not be in sync with
- // |clock_|. Because of this, the scheduler may run this task when
- // |clock->Now()| is smaller than |deadline()|. In that case, retry later.
- // This shouldn't happen in production.
- if (clock_->Now() < deadline()) {
- SetImpl();
- return;
- }
- DCHECK_LE(deadline(), clock_->Now());
- Fire();
- }
- // base::TickClock:
- base::TimeTicks NowTicks() const override {
- return quic::QuicChromiumClock::QuicTimeToTimeTicks(clock_->Now());
- }
- const raw_ptr<const quic::QuicClock> clock_;
- base::RepeatingClosure on_alarm_callback_;
- const std::unique_ptr<base::OneShotTimer> timer_;
- };
- } // namespace
- QuicChromiumAlarmFactory::QuicChromiumAlarmFactory(
- base::SequencedTaskRunner* task_runner,
- const quic::QuicClock* clock)
- : task_runner_(task_runner), clock_(clock) {}
- QuicChromiumAlarmFactory::~QuicChromiumAlarmFactory() = default;
- quic::QuicArenaScopedPtr<quic::QuicAlarm> QuicChromiumAlarmFactory::CreateAlarm(
- quic::QuicArenaScopedPtr<quic::QuicAlarm::Delegate> delegate,
- quic::QuicConnectionArena* arena) {
- if (arena != nullptr) {
- return arena->New<QuicChromeAlarm>(clock_, task_runner_,
- std::move(delegate));
- } else {
- return quic::QuicArenaScopedPtr<quic::QuicAlarm>(
- new QuicChromeAlarm(clock_, task_runner_, std::move(delegate)));
- }
- }
- quic::QuicAlarm* QuicChromiumAlarmFactory::CreateAlarm(
- quic::QuicAlarm::Delegate* delegate) {
- return new QuicChromeAlarm(
- clock_, task_runner_,
- quic::QuicArenaScopedPtr<quic::QuicAlarm::Delegate>(delegate));
- }
- } // namespace net
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