net/quic/quic_alarm.cc

   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/quic/quic_alarm.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace net {
  10
  11 QuicAlarm::QuicAlarm(Delegate* delegate)
  12     : delegate_(delegate),
  13       deadline_(QuicTime::Zero()) {
  14 }
  15
  16 QuicAlarm::~QuicAlarm() {}
  17
  18 void QuicAlarm::Set(QuicTime deadline) {
  19   DCHECK(!IsSet());
  20   DCHECK(deadline.IsInitialized());
  21   deadline_ = deadline;
  22   SetImpl();
  23 }
  24
  25 void QuicAlarm::Cancel() {
  26   deadline_ = QuicTime::Zero();
  27   CancelImpl();
  28 }
  29
  30 bool QuicAlarm::IsSet() const {
  31   return deadline_.IsInitialized();
  32 }
  33
  34 void QuicAlarm::Fire() {
  35   if (!deadline_.IsInitialized()) {
  36     return;
  37   }
  38
  39   deadline_ = QuicTime::Zero();
  40   QuicTime deadline = delegate_->OnAlarm();
  41   // delegate_->OnAlarm() might call Set(), in which case  deadline_ will
  42   // already contain the new value, so don't overwrite it.
  43   if (!deadline_.IsInitialized() && deadline.IsInitialized()) {
  44     Set(deadline);
  45   }
  46 }
  47
  48 }  // namespace net