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118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/quic/chromium/quic_chromium_alarm_factory.h"
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#include "base/bind.h"
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#include "base/location.h"
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#include "base/logging.h"
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#include "base/metrics/sparse_histogram.h"
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#include "base/task_runner.h"
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#include "base/time/time.h"
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namespace net {
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namespace {
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class QuicChromeAlarm : public QuicAlarm {
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public:
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QuicChromeAlarm(const QuicClock* clock,
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base::TaskRunner* task_runner,
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QuicArenaScopedPtr<QuicAlarm::Delegate> delegate)
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: QuicAlarm(std::move(delegate)),
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clock_(clock),
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task_runner_(task_runner),
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task_deadline_(QuicTime::Zero()),
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weak_factory_(this) {}
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protected:
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void SetImpl() override {
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DCHECK(deadline().IsInitialized());
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if (task_deadline_.IsInitialized()) {
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if (task_deadline_ <= deadline()) {
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// Since tasks can not be un-posted, OnAlarm will be invoked which
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// will notice that deadline has not yet been reached, and will set
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// the alarm for the new deadline.
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return;
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}
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// The scheduled task is after new deadline. Invalidate the weak ptrs
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// so that task does not execute when we're not expecting it.
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weak_factory_.InvalidateWeakPtrs();
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}
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int64_t delay_us = (deadline() - (clock_->Now())).ToMicroseconds();
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if (delay_us < 0) {
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delay_us = 0;
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}
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task_runner_->PostDelayedTask(
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FROM_HERE,
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base::Bind(&QuicChromeAlarm::OnAlarm, weak_factory_.GetWeakPtr()),
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base::TimeDelta::FromMicroseconds(delay_us));
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task_deadline_ = deadline();
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}
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void CancelImpl() override {
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DCHECK(!deadline().IsInitialized());
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// Since tasks can not be un-posted, OnAlarm will be invoked which
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// will notice that deadline is not Initialized and will do nothing.
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}
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private:
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void OnAlarm() {
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DCHECK(task_deadline_.IsInitialized());
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task_deadline_ = QuicTime::Zero();
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// The alarm may have been cancelled.
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if (!deadline().IsInitialized()) {
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return;
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}
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// The alarm may have been re-set to a later time.
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if (clock_->Now() < deadline()) {
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SetImpl();
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return;
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}
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Fire();
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}
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const QuicClock* clock_;
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base::TaskRunner* task_runner_;
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// If a task has been posted to the message loop, this is the time it
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// was scheduled to fire. Tracking this allows us to avoid posting a
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// new tast if the new deadline is in the future, but permits us to
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// post a new task when the new deadline now earlier than when
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// previously posted.
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QuicTime task_deadline_;
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base::WeakPtrFactory<QuicChromeAlarm> weak_factory_;
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};
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} // namespace
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QuicChromiumAlarmFactory::QuicChromiumAlarmFactory(
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base::TaskRunner* task_runner,
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const QuicClock* clock)
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: task_runner_(task_runner), clock_(clock), weak_factory_(this) {}
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QuicChromiumAlarmFactory::~QuicChromiumAlarmFactory() {}
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QuicArenaScopedPtr<QuicAlarm> QuicChromiumAlarmFactory::CreateAlarm(
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QuicArenaScopedPtr<QuicAlarm::Delegate> delegate,
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QuicConnectionArena* arena) {
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if (arena != nullptr) {
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return arena->New<QuicChromeAlarm>(clock_, task_runner_,
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std::move(delegate));
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} else {
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return QuicArenaScopedPtr<QuicAlarm>(
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new QuicChromeAlarm(clock_, task_runner_, std::move(delegate)));
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}
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}
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QuicAlarm* QuicChromiumAlarmFactory::CreateAlarm(
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QuicAlarm::Delegate* delegate) {
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return new QuicChromeAlarm(clock_, task_runner_,
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QuicArenaScopedPtr<QuicAlarm::Delegate>(delegate));
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}
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} // namespace net
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