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// Copyright 2013 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 "quic/core/quic_alarm.h"
namespace quic {
QuicAlarm::QuicAlarm(QuicArenaScopedPtr<Delegate> delegate)
: delegate_(std::move(delegate)), deadline_(QuicTime::Zero()) {}
QuicAlarm::~QuicAlarm() {}
void QuicAlarm::Set(QuicTime new_deadline) {
QUICHE_DCHECK(!IsSet());
QUICHE_DCHECK(new_deadline.IsInitialized());
deadline_ = new_deadline;
SetImpl();
}
void QuicAlarm::Cancel() {
if (!IsSet()) {
// Don't try to cancel an alarm that hasn't been set.
return;
}
deadline_ = QuicTime::Zero();
CancelImpl();
}
void QuicAlarm::Update(QuicTime new_deadline, QuicTime::Delta granularity) {
if (!new_deadline.IsInitialized()) {
Cancel();
return;
}
if (std::abs((new_deadline - deadline_).ToMicroseconds()) <
granularity.ToMicroseconds()) {
return;
}
const bool was_set = IsSet();
deadline_ = new_deadline;
if (was_set) {
UpdateImpl();
} else {
SetImpl();
}
}
bool QuicAlarm::IsSet() const {
return deadline_.IsInitialized();
}
void QuicAlarm::Fire() {
if (!IsSet()) {
return;
}
deadline_ = QuicTime::Zero();
delegate_->OnAlarm();
}
void QuicAlarm::UpdateImpl() {
// CancelImpl and SetImpl take the new deadline by way of the deadline_
// member, so save and restore deadline_ before canceling.
const QuicTime new_deadline = deadline_;
deadline_ = QuicTime::Zero();
CancelImpl();
deadline_ = new_deadline;
SetImpl();
}
} // namespace quic
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