1 // Copyright 2013 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 "net/third_party/quiche/src/quic/core/quic_alarm.h"
6 
7 namespace quic {
8 
QuicAlarm(QuicArenaScopedPtr<Delegate> delegate)9 QuicAlarm::QuicAlarm(QuicArenaScopedPtr<Delegate> delegate)
10     : delegate_(std::move(delegate)), deadline_(QuicTime::Zero()) {}
11 
~QuicAlarm()12 QuicAlarm::~QuicAlarm() {}
13 
Set(QuicTime new_deadline)14 void QuicAlarm::Set(QuicTime new_deadline) {
15   DCHECK(!IsSet());
16   DCHECK(new_deadline.IsInitialized());
17   deadline_ = new_deadline;
18   SetImpl();
19 }
20 
Cancel()21 void QuicAlarm::Cancel() {
22   if (!IsSet()) {
23     // Don't try to cancel an alarm that hasn't been set.
24     return;
25   }
26   deadline_ = QuicTime::Zero();
27   CancelImpl();
28 }
29 
Update(QuicTime new_deadline,QuicTime::Delta granularity)30 void QuicAlarm::Update(QuicTime new_deadline, QuicTime::Delta granularity) {
31   if (!new_deadline.IsInitialized()) {
32     Cancel();
33     return;
34   }
35   if (std::abs((new_deadline - deadline_).ToMicroseconds()) <
36       granularity.ToMicroseconds()) {
37     return;
38   }
39   const bool was_set = IsSet();
40   deadline_ = new_deadline;
41   if (was_set) {
42     UpdateImpl();
43   } else {
44     SetImpl();
45   }
46 }
47 
IsSet() const48 bool QuicAlarm::IsSet() const {
49   return deadline_.IsInitialized();
50 }
51 
Fire()52 void QuicAlarm::Fire() {
53   if (!IsSet()) {
54     return;
55   }
56 
57   deadline_ = QuicTime::Zero();
58   delegate_->OnAlarm();
59 }
60 
UpdateImpl()61 void QuicAlarm::UpdateImpl() {
62   // CancelImpl and SetImpl take the new deadline by way of the deadline_
63   // member, so save and restore deadline_ before canceling.
64   const QuicTime new_deadline = deadline_;
65 
66   deadline_ = QuicTime::Zero();
67   CancelImpl();
68 
69   deadline_ = new_deadline;
70   SetImpl();
71 }
72 
73 }  // namespace quic
74