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// 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.
// The pure virtual class for send side loss detection algorithm.
#include "quiche/quic/core/congestion_control/send_algorithm_interface.h"
#include "quiche/quic/core/quic_config.h"
#include "quiche/quic/core/quic_packets.h"
#include "quiche/quic/core/quic_time.h"
#include "quiche/quic/core/quic_types.h"
#include "quiche/quic/platform/api/quic_export.h"
namespace quic {
class QuicUnackedPacketMap;
class RttStats;
class QUIC_EXPORT_PRIVATE LossDetectionInterface {
virtual ~LossDetectionInterface() {}
virtual void SetFromConfig(const QuicConfig& config,
Perspective perspective) = 0;
struct QUIC_NO_EXPORT DetectionStats {
// Maximum sequence reordering observed in newly acked packets.
QuicPacketCount sent_packets_max_sequence_reordering = 0;
QuicPacketCount sent_packets_num_borderline_time_reorderings = 0;
// Total detection response time for lost packets from this detection.
// See QuicConnectionStats for the definition of detection response time.
float total_loss_detection_response_time = 0.0;
// Called when a new ack arrives or the loss alarm fires.
virtual DetectionStats DetectLosses(
const QuicUnackedPacketMap& unacked_packets, QuicTime time,
const RttStats& rtt_stats, QuicPacketNumber largest_newly_acked,
const AckedPacketVector& packets_acked,
LostPacketVector* packets_lost) = 0;
// Get the time the LossDetectionAlgorithm wants to re-evaluate losses.
// Returns QuicTime::Zero if no alarm needs to be set.
virtual QuicTime GetLossTimeout() const = 0;
// Called when |packet_number| was detected lost but gets acked later.
virtual void SpuriousLossDetected(
const QuicUnackedPacketMap& unacked_packets, const RttStats& rtt_stats,
QuicTime ack_receive_time, QuicPacketNumber packet_number,
QuicPacketNumber previous_largest_acked) = 0;
virtual void OnConfigNegotiated() = 0;
virtual void OnMinRttAvailable() = 0;
virtual void OnUserAgentIdKnown() = 0;
virtual void OnConnectionClosed() = 0;
// Called when a reordering is detected by the loss algorithm, but _before_
// the reordering_shift and reordering_threshold are consulted to see whether
// it is a loss.
virtual void OnReorderingDetected() = 0;
} // namespace quic