Further cleanup to QuicAckNotifier and QuicAckNotifierManager.

net/quic/quic_ack_notifier_manager.cc

 // 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 "net/quic/quic_ack_notifier_manager.h"
 
 #include <stddef.h>
 #include <list>
 #include <map>
 #include <utility>
@@ skipping 22 matching lines @@
                                        QuicTime::Delta delta_largest_observed) {
   // Inform all the registered AckNotifiers of the new ACK.
   auto map_it = ack_notifier_map_.find(sequence_number);
   if (map_it == ack_notifier_map_.end()) {
     // No AckNotifier is interested in this sequence number.
     return;
   }
 
   // One or more AckNotifiers are registered as interested in this sequence
   // number. Iterate through them and call OnAck on each.
-  AckNotifierList& ack_notifier_list = map_it->second;
-  for (QuicAckNotifier* ack_notifier : ack_notifier_list) {
-    ack_notifier->OnAck(sequence_number, delta_largest_observed);
-
-    // If this has resulted in an empty AckNotifer, erase it.
-    if (!ack_notifier->HasUnackedPackets()) {
+  for (QuicAckNotifier* ack_notifier : map_it->second) {
+    if (ack_notifier->OnAck(delta_largest_observed)) {
+      // If this has resulted in an empty AckNotifer, erase it.
       delete ack_notifier;
     }
   }
 
   // Remove the sequence number from the map as we have notified all the
   // registered AckNotifiers, and we won't see it again.
   ack_notifier_map_.erase(map_it);
 }
 
 void AckNotifierManager::OnPacketRetransmitted(
@@ skipping 14 matching lines @@
 
   // The old sequence number is no longer of interest, copy the updated
   // AckNotifiers to the new sequence number before deleting the old.
   ack_notifier_map_[new_sequence_number] = ack_notifier_list;
   ack_notifier_map_.erase(map_it);
 }
 
 void AckNotifierManager::OnSerializedPacket(
     const SerializedPacket& serialized_packet) {
   if (FLAGS_quic_attach_ack_notifiers_to_packets) {
-    // Inform each attached AckNotifier of the packet's sequence number.
+    // Inform each attached AckNotifier of the packet's serialization.
+    AckNotifierList& notifier_list =
+        ack_notifier_map_[serialized_packet.sequence_number];
     for (QuicAckNotifier* notifier : serialized_packet.notifiers) {
       if (notifier == nullptr) {
         LOG(DFATAL) << "AckNotifier should not be nullptr.";
         continue;
       }
       notifier->OnSerializedPacket();
 
       // Update the mapping in the other direction, from sequence number to
       // AckNotifier.
-      ack_notifier_map_[serialized_packet.sequence_number].push_back(notifier);
+      notifier_list.push_back(notifier);
     }
   } else {
     // AckNotifiers can only be attached to retransmittable frames.
     RetransmittableFrames* frames = serialized_packet.retransmittable_frames;
     if (frames == nullptr) {
       return;
     }
 
     // For each frame in |serialized_packet|, inform any attached AckNotifiers
     // of the packet's sequence number.
     for (const QuicFrame& quic_frame : frames->frames()) {
       if (quic_frame.type != STREAM_FRAME ||
           quic_frame.stream_frame->notifier == nullptr) {
         continue;
       }
 
       QuicAckNotifier* notifier = quic_frame.stream_frame->notifier;
       notifier->OnSerializedPacket();
 
       // Update the mapping in the other direction, from sequence number to
       // AckNotifier.
       ack_notifier_map_[serialized_packet.sequence_number].push_back(notifier);
     }
   }
 }
 
 }  // namespace net