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// Copyright 2012 The Chromium Authors
// 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/check.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/task/sequenced_task_runner.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,
scoped_refptr<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(std::move(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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