Adds dynamic setting of FEC group size based on the connection's current

net/quic/quic_packet_generator.h

 // Copyright (c) 2012 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.
 //
 // Responsible for generating packets on behalf of a QuicConnection.
 // Packets are serialized just-in-time.  Control frames are queued.
 // Ack and Feedback frames will be requested from the Connection
 // just-in-time.  When a packet needs to be sent, the Generator
 // will serialize a packet and pass it to QuicConnection::SendOrQueuePacket()
 //
@@ skipping 36 matching lines @@
 // operations can be grouped into the same FEC group.
 //
 // When an FEC packet is generated, it will be send to the Delegate,
 // even if the Delegate has become unwritable after handling the
 // data packet immediately proceeding the FEC packet.
 
 #ifndef NET_QUIC_QUIC_PACKET_GENERATOR_H_
 #define NET_QUIC_QUIC_PACKET_GENERATOR_H_
 
 #include "net/quic/quic_packet_creator.h"
+#include "net/quic/quic_sent_packet_manager.h"
 #include "net/quic/quic_types.h"
 
 namespace net {
 
 namespace test {
 class QuicPacketGeneratorPeer;
 }  // namespace test
 
 class QuicAckNotifier;
 
-class NET_EXPORT_PRIVATE QuicPacketGenerator {
+class NET_EXPORT_PRIVATE QuicPacketGenerator
+    : public QuicSentPacketManager::NetworkChangeVisitor {
  public:
   class NET_EXPORT_PRIVATE DelegateInterface {
    public:
     virtual ~DelegateInterface() {}
     virtual bool ShouldGeneratePacket(TransmissionType transmission_type,
                                       HasRetransmittableData retransmittable,
                                       IsHandshake handshake) = 0;
     virtual QuicAckFrame* CreateAckFrame() = 0;
     virtual QuicCongestionFeedbackFrame* CreateFeedbackFrame() = 0;
     virtual QuicStopWaitingFrame* CreateStopWaitingFrame() = 0;
@@ skipping 13 matching lines @@
     virtual void OnFrameAddedToPacket(const QuicFrame& frame) {}
   };
 
   QuicPacketGenerator(QuicConnectionId connection_id,
                       QuicFramer* framer,
                       QuicRandom* random_generator,
                       DelegateInterface* delegate);
 
   virtual ~QuicPacketGenerator();
 
+  // QuicSentPacketManager::NetworkChangeVisitor methods.
+  virtual void OnCongestionWindowChange(QuicByteCount congestion_window)
+      OVERRIDE;
+
   // Indicates that an ACK frame should be sent.  If |also_send_feedback| is
   // true, then it also indicates a CONGESTION_FEEDBACK frame should be sent.
   // If |also_send_stop_waiting| is true, then it also indicates that a
   // STOP_WAITING frame should be sent as well.
   // The contents of the frame(s) will be generated via a call to the delegates
   // CreateAckFrame() and CreateFeedbackFrame() when the packet is serialized.
   void SetShouldSendAck(bool also_send_feedback,
                         bool also_send_stop_waiting);
 
   // Indicates that a STOP_WAITING frame should be sent.
@@ skipping 73 matching lines @@
   // Turn on FEC protection for subsequent packets in the generator.
   // If no FEC group is currently open in the creator, this method flushes any
   // queued frames in the generator and in the creator, and it then turns FEC on
   // in the creator. This method may be called with an open FEC group in the
   // creator, in which case, only the generator's state is altered.
   void MaybeStartFecProtection();
 
   // Serializes and calls the delegate on an FEC packet if one was under
   // construction in the creator. When |force| is false, it relies on the
   // creator being ready to send an FEC packet, otherwise FEC packet is sent
-  // as long as one is under construction in the creator.  Also tries to turns
+  // as long as one is under construction in the creator. Also tries to turn
   // off FEC protection in the creator if it's off in the generator.
   void MaybeSendFecPacketAndCloseGroup(bool force);
 
   void SendQueuedFrames(bool flush);
 
   // Test to see if we have pending ack, feedback, or control frames.
   bool HasPendingFrames() const;
   // Test to see if the addition of a pending frame (which might be
   // retransmittable) would still allow the resulting packet to be sent now.
   bool CanSendWithNextPendingFrameAddition() const;
@@ skipping 29 matching lines @@
   scoped_ptr<QuicAckFrame> pending_ack_frame_;
   scoped_ptr<QuicCongestionFeedbackFrame> pending_feedback_frame_;
   scoped_ptr<QuicStopWaitingFrame> pending_stop_waiting_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketGenerator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PACKET_GENERATOR_H_