net/quic/congestion_control/inter_arrival_sender.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_QUIC_CONGESTION_CONTROL_INTER_ARRIVAL_SENDER_H_
   6 #define NET_QUIC_CONGESTION_CONTROL_INTER_ARRIVAL_SENDER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "net/base/net_export.h"
  11 #include "net/quic/congestion_control/channel_estimator.h"
  12 #include "net/quic/congestion_control/inter_arrival_bitrate_ramp_up.h"
  13 #include "net/quic/congestion_control/inter_arrival_overuse_detector.h"
  14 #include "net/quic/congestion_control/inter_arrival_probe.h"
  15 #include "net/quic/congestion_control/inter_arrival_state_machine.h"
  16 #include "net/quic/congestion_control/paced_sender.h"
  17 #include "net/quic/congestion_control/send_algorithm_interface.h"
  18 #include "net/quic/quic_bandwidth.h"
  19 #include "net/quic/quic_clock.h"
  20 #include "net/quic/quic_protocol.h"
  21 #include "net/quic/quic_time.h"
  22
  23 namespace net {
  24
  25 class NET_EXPORT_PRIVATE InterArrivalSender : public SendAlgorithmInterface {
  26  public:
  27   explicit InterArrivalSender(const QuicClock* clock);
  28   virtual ~InterArrivalSender();
  29
  30   static QuicBandwidth CalculateSentBandwidth(
  31       const SendAlgorithmInterface::SentPacketsMap& sent_packets_map,
  32       QuicTime feedback_receive_time);
  33
  34   // Start implementation of SendAlgorithmInterface.
  35   virtual void SetFromConfig(const QuicConfig& config, bool is_server) OVERRIDE;
  36   virtual void SetMaxPacketSize(QuicByteCount max_packet_size) OVERRIDE;
  37   virtual void OnIncomingQuicCongestionFeedbackFrame(
  38       const QuicCongestionFeedbackFrame& feedback,
  39       QuicTime feedback_receive_time,
  40       const SentPacketsMap& sent_packets) OVERRIDE;
  41   virtual void OnPacketAcked(QuicPacketSequenceNumber acked_sequence_number,
  42                              QuicByteCount acked_bytes) OVERRIDE;
  43   virtual void OnPacketLost(QuicPacketSequenceNumber sequence_number,
  44                             QuicTime ack_receive_time) OVERRIDE;
  45   virtual bool OnPacketSent(
  46       QuicTime sent_time,
  47       QuicPacketSequenceNumber sequence_number,
  48       QuicByteCount bytes,
  49       TransmissionType transmission_type,
  50       HasRetransmittableData has_retransmittable_data) OVERRIDE;
  51   virtual void OnRetransmissionTimeout(bool packets_retransmitted) OVERRIDE;
  52   virtual void OnPacketAbandoned(QuicPacketSequenceNumber sequence_number,
  53                                  QuicByteCount abandoned_bytes) OVERRIDE;
  54   virtual QuicTime::Delta TimeUntilSend(
  55       QuicTime now,
  56       TransmissionType transmission_type,
  57       HasRetransmittableData has_retransmittable_data,
  58       IsHandshake handshake) OVERRIDE;
  59   virtual QuicBandwidth BandwidthEstimate() const OVERRIDE;
  60   virtual void UpdateRtt(QuicTime::Delta rtt_sample) OVERRIDE;
  61   virtual QuicTime::Delta SmoothedRtt() const OVERRIDE;
  62   virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE;
  63   virtual QuicByteCount GetCongestionWindow() const OVERRIDE;
  64   // End implementation of SendAlgorithmInterface.
  65
  66  private:
  67   void EstimateDelayBandwidth(QuicTime feedback_receive_time,
  68                               QuicBandwidth sent_bandwidth);
  69   void EstimateNewBandwidth(QuicTime feedback_receive_time,
  70                             QuicBandwidth sent_bandwidth);
  71   void EstimateNewBandwidthAfterDraining(
  72       QuicTime feedback_receive_time,
  73       QuicTime::Delta estimated_congestion_delay);
  74   void EstimateBandwidthAfterLossEvent(QuicTime feedback_receive_time);
  75   void EstimateBandwidthAfterDelayEvent(
  76       QuicTime feedback_receive_time,
  77       QuicTime::Delta estimated_congestion_delay);
  78   void ResetCurrentBandwidth(QuicTime feedback_receive_time,
  79                              QuicBandwidth new_rate);
  80   bool ProbingPhase(QuicTime feedback_receive_time);
  81
  82   bool probing_;  // Are we currently in the probing phase?
  83   QuicByteCount max_segment_size_;
  84   QuicBandwidth current_bandwidth_;
  85   QuicTime::Delta smoothed_rtt_;
  86   scoped_ptr<ChannelEstimator> channel_estimator_;
  87   scoped_ptr<InterArrivalBitrateRampUp> bitrate_ramp_up_;
  88   scoped_ptr<InterArrivalOveruseDetector> overuse_detector_;
  89   scoped_ptr<InterArrivalProbe> probe_;
  90   scoped_ptr<InterArrivalStateMachine> state_machine_;
  91   scoped_ptr<PacedSender> paced_sender_;
  92   int accumulated_number_of_lost_packets_;
  93   BandwidthUsage bandwidth_usage_state_;
  94   QuicTime back_down_time_;  // Time when we decided to back down.
  95   QuicBandwidth back_down_bandwidth_;  // Bandwidth before backing down.
  96   QuicTime::Delta back_down_congestion_delay_;  // Delay when backing down.
  97
  98   DISALLOW_COPY_AND_ASSIGN(InterArrivalSender);
  99 };
 100
 101 }  // namespace net
 102 #endif  // NET_QUIC_CONGESTION_CONTROL_INTER_ARRIVAL_SENDER_H_