Landing Recent QUIC changes until 01/28/2016 18:41 UTC

net/quic/congestion_control/tcp_loss_algorithm.h

-// Copyright 2014 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.
-
-#ifndef NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_
-#define NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_
-
-#include <algorithm>
-#include <map>
-
-#include "base/macros.h"
-#include "net/quic/congestion_control/loss_detection_interface.h"
-#include "net/quic/quic_protocol.h"
-#include "net/quic/quic_time.h"
-#include "net/quic/quic_unacked_packet_map.h"
-
-namespace net {
-
-// Class which implement's TCP's approach of detecting loss when 3 nacks have
-// been received for a packet.  Also implements TCP's early retransmit(RFC5827).
-class NET_EXPORT_PRIVATE TCPLossAlgorithm : public LossDetectionInterface {
- public:
-  // TCP retransmits after 3 nacks.
-  static const QuicPacketCount kNumberOfNacksBeforeRetransmission = 3;
-
-  TCPLossAlgorithm();
-  ~TCPLossAlgorithm() override {}
-
-  LossDetectionType GetLossDetectionType() const override;
-
-  // Uses nack counts to decide when packets are lost.
-  PacketNumberSet DetectLostPackets(const QuicUnackedPacketMap& unacked_packets,
-                                    const QuicTime& time,
-                                    QuicPacketNumber largest_observed,
-                                    const RttStats& rtt_stats) override;
-  // Unsupported.
-  void DetectLosses(
-      const QuicUnackedPacketMap& unacked_packets,
-      const QuicTime& time,
-      const RttStats& rtt_stats,
-      SendAlgorithmInterface::CongestionVector* packets_lost) override;
-
-  // Returns a non-zero value when the early retransmit timer is active.
-  QuicTime GetLossTimeout() const override;
-
- private:
-  QuicTime loss_detection_timeout_;
-
-  DISALLOW_COPY_AND_ASSIGN(TCPLossAlgorithm);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_