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.
5 #include "net/quic/quic_ack_notifier_manager.h"
13 #include "base/stl_util.h"
14 #include "net/quic/quic_ack_notifier.h"
15 #include "net/quic/quic_protocol.h"
19 AckNotifierManager::AckNotifierManager() {}
21 AckNotifierManager::~AckNotifierManager() {
22 STLDeleteElements(&ack_notifiers_);
25 void AckNotifierManager::OnPacketAcked(
26 QuicPacketSequenceNumber sequence_number) {
27 // Inform all the registered AckNotifiers of the new ACK.
28 AckNotifierMap::iterator map_it = ack_notifier_map_.find(sequence_number);
29 if (map_it == ack_notifier_map_.end()) {
30 // No AckNotifier is interested in this sequence number.
34 // One or more AckNotifiers are registered as interested in this sequence
35 // number. Iterate through them and call OnAck on each.
36 for (AckNotifierSet::iterator set_it = map_it->second.begin();
37 set_it != map_it->second.end(); ++set_it) {
38 QuicAckNotifier* ack_notifier = *set_it;
39 ack_notifier->OnAck(sequence_number);
41 // If this has resulted in an empty AckNotifer, erase it.
42 if (ack_notifier->IsEmpty()) {
44 ack_notifiers_.erase(ack_notifier);
48 // Remove the sequence number from the map as we have notified all the
49 // registered AckNotifiers, and we won't see it again.
50 ack_notifier_map_.erase(map_it);
53 void AckNotifierManager::UpdateSequenceNumber(
54 QuicPacketSequenceNumber old_sequence_number,
55 QuicPacketSequenceNumber new_sequence_number) {
56 AckNotifierMap::iterator map_it = ack_notifier_map_.find(old_sequence_number);
57 if (map_it != ack_notifier_map_.end()) {
58 // We will add an entry to the map for the new sequence number, and move
60 // list of AckNotifiers over.
61 AckNotifierSet new_set;
62 for (AckNotifierSet::iterator notifier_it = map_it->second.begin();
63 notifier_it != map_it->second.end(); ++notifier_it) {
65 ->UpdateSequenceNumber(old_sequence_number, new_sequence_number);
66 new_set.insert(*notifier_it);
68 ack_notifier_map_[new_sequence_number] = new_set;
69 ack_notifier_map_.erase(map_it);
73 void AckNotifierManager::OnSerializedPacket(
74 const SerializedPacket& serialized_packet) {
75 // Run through all the frames and if any of them are stream frames and have
76 // an AckNotifier registered, then inform the AckNotifier that it should be
77 // interested in this packet's sequence number.
79 RetransmittableFrames* frames = serialized_packet.retransmittable_frames;
81 // AckNotifiers can only be attached to retransmittable frames.
86 for (QuicFrames::const_iterator it = frames->frames().begin();
87 it != frames->frames().end(); ++it) {
88 if (it->type == STREAM_FRAME && it->stream_frame->notifier != NULL) {
89 // The AckNotifier needs to know it is tracking this packet's sequence
91 it->stream_frame->notifier->AddSequenceNumber(
92 serialized_packet.sequence_number);
94 // Add the AckNotifier to our set of AckNotifiers.
95 ack_notifiers_.insert(it->stream_frame->notifier);
97 // Update the mapping in the other direction, from sequence
98 // number to AckNotifier.
99 ack_notifier_map_[serialized_packet.sequence_number]
100 .insert(it->stream_frame->notifier);