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

net/quic/congestion_control/time_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_TIME_LOSS_ALGORITHM_H_
-#define NET_QUIC_CONGESTION_CONTROL_TIME_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 {
-
-// A loss detection algorithm which avoids spurious losses and retransmissions
-// by waiting 1.25 RTTs after a packet was sent instead of nack count.
-class NET_EXPORT_PRIVATE TimeLossAlgorithm : public LossDetectionInterface {
- public:
-  TimeLossAlgorithm();
-  ~TimeLossAlgorithm() override {}
-
-  LossDetectionType GetLossDetectionType() const override;
-
-  // Declares pending packets less than the largest observed lost when it has
-  // been 1.25 RTT since they were sent.  Packets larger than the largest
-  // observed are retransmitted via TLP.
-  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 the time the next packet will be lost, or zero if there
-  // are no nacked pending packets outstanding.
-  // TODO(ianswett): Ideally the RTT variance and the RTT would be used to
-  // determine the time a packet is considered lost.
-  // TODO(ianswett): Consider using Max(1.25 * srtt, 1.125 * last_rtt).
-  QuicTime GetLossTimeout() const override;
-
- private:
-  QuicTime loss_detection_timeout_;
-
-  DISALLOW_COPY_AND_ASSIGN(TimeLossAlgorithm);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_