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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // A send algorithm which adds pacing on top of an another send algorithm. | 5 // A send algorithm which adds pacing on top of an another send algorithm. |
6 // It uses the underlying sender's bandwidth estimate to determine the | 6 // It uses the underlying sender's bandwidth estimate to determine the |
7 // pacing rate to be used. It also takes into consideration the expected | 7 // pacing rate to be used. It also takes into consideration the expected |
8 // resolution of the underlying alarm mechanism to ensure that alarms are | 8 // resolution of the underlying alarm mechanism to ensure that alarms are |
9 // not set too aggressively, and to smooth out variations. | 9 // not set too aggressively, and to smooth out variations. |
10 | 10 |
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28 // Create a PacingSender to wrap the specified sender. |alarm_granularity| | 28 // Create a PacingSender to wrap the specified sender. |alarm_granularity| |
29 // indicates to the pacer to send that far into the future, since it should | 29 // indicates to the pacer to send that far into the future, since it should |
30 // not expect a callback before that time delta. |initial_packet_burst| is | 30 // not expect a callback before that time delta. |initial_packet_burst| is |
31 // the number of packets sent without pacing after quiescence. | 31 // the number of packets sent without pacing after quiescence. |
32 PacingSender(SendAlgorithmInterface* sender, | 32 PacingSender(SendAlgorithmInterface* sender, |
33 QuicTime::Delta alarm_granularity, | 33 QuicTime::Delta alarm_granularity, |
34 uint32 initial_packet_burst); | 34 uint32 initial_packet_burst); |
35 virtual ~PacingSender(); | 35 virtual ~PacingSender(); |
36 | 36 |
37 // SendAlgorithmInterface methods. | 37 // SendAlgorithmInterface methods. |
38 virtual void SetFromConfig(const QuicConfig& config, bool is_server) OVERRIDE; | 38 virtual void SetFromConfig(const QuicConfig& config, bool is_server) override; |
39 virtual void SetNumEmulatedConnections(int num_connections) OVERRIDE; | 39 virtual void SetNumEmulatedConnections(int num_connections) override; |
40 virtual void OnIncomingQuicCongestionFeedbackFrame( | 40 virtual void OnIncomingQuicCongestionFeedbackFrame( |
41 const QuicCongestionFeedbackFrame& feedback, | 41 const QuicCongestionFeedbackFrame& feedback, |
42 QuicTime feedback_receive_time) OVERRIDE; | 42 QuicTime feedback_receive_time) override; |
43 virtual void OnCongestionEvent(bool rtt_updated, | 43 virtual void OnCongestionEvent(bool rtt_updated, |
44 QuicByteCount bytes_in_flight, | 44 QuicByteCount bytes_in_flight, |
45 const CongestionVector& acked_packets, | 45 const CongestionVector& acked_packets, |
46 const CongestionVector& lost_packets) OVERRIDE; | 46 const CongestionVector& lost_packets) override; |
47 virtual bool OnPacketSent(QuicTime sent_time, | 47 virtual bool OnPacketSent(QuicTime sent_time, |
48 QuicByteCount bytes_in_flight, | 48 QuicByteCount bytes_in_flight, |
49 QuicPacketSequenceNumber sequence_number, | 49 QuicPacketSequenceNumber sequence_number, |
50 QuicByteCount bytes, | 50 QuicByteCount bytes, |
51 HasRetransmittableData is_retransmittable) OVERRIDE; | 51 HasRetransmittableData is_retransmittable) override; |
52 virtual void OnRetransmissionTimeout(bool packets_retransmitted) OVERRIDE; | 52 virtual void OnRetransmissionTimeout(bool packets_retransmitted) override; |
53 virtual void RevertRetransmissionTimeout() OVERRIDE; | 53 virtual void RevertRetransmissionTimeout() override; |
54 virtual QuicTime::Delta TimeUntilSend( | 54 virtual QuicTime::Delta TimeUntilSend( |
55 QuicTime now, | 55 QuicTime now, |
56 QuicByteCount bytes_in_flight, | 56 QuicByteCount bytes_in_flight, |
57 HasRetransmittableData has_retransmittable_data) const OVERRIDE; | 57 HasRetransmittableData has_retransmittable_data) const override; |
58 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; | 58 virtual QuicBandwidth BandwidthEstimate() const override; |
59 virtual bool HasReliableBandwidthEstimate() const OVERRIDE; | 59 virtual bool HasReliableBandwidthEstimate() const override; |
60 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; | 60 virtual QuicTime::Delta RetransmissionDelay() const override; |
61 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; | 61 virtual QuicByteCount GetCongestionWindow() const override; |
62 virtual bool InSlowStart() const OVERRIDE; | 62 virtual bool InSlowStart() const override; |
63 virtual bool InRecovery() const OVERRIDE; | 63 virtual bool InRecovery() const override; |
64 virtual QuicByteCount GetSlowStartThreshold() const OVERRIDE; | 64 virtual QuicByteCount GetSlowStartThreshold() const override; |
65 virtual CongestionControlType GetCongestionControlType() const OVERRIDE; | 65 virtual CongestionControlType GetCongestionControlType() const override; |
66 | 66 |
67 private: | 67 private: |
68 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 68 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
69 QuicTime::Delta alarm_granularity_; | 69 QuicTime::Delta alarm_granularity_; |
70 uint32 initial_packet_burst_; | 70 uint32 initial_packet_burst_; |
71 mutable uint32 burst_tokens_; | 71 mutable uint32 burst_tokens_; |
72 // Send time of the last packet considered delayed. | 72 // Send time of the last packet considered delayed. |
73 QuicTime last_delayed_packet_sent_time_; | 73 QuicTime last_delayed_packet_sent_time_; |
74 QuicTime next_packet_send_time_; // When can the next packet be sent. | 74 QuicTime next_packet_send_time_; // When can the next packet be sent. |
75 mutable bool was_last_send_delayed_; // True when the last send was delayed. | 75 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
76 bool has_valid_rtt_; // True if we have at least one RTT update. | 76 bool has_valid_rtt_; // True if we have at least one RTT update. |
77 | 77 |
78 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 78 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
79 }; | 79 }; |
80 | 80 |
81 } // namespace net | 81 } // namespace net |
82 | 82 |
83 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 83 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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