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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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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 PacingRate() const override; |
58 virtual QuicBandwidth BandwidthEstimate() const override; | 59 virtual QuicBandwidth BandwidthEstimate() const override; |
59 virtual bool HasReliableBandwidthEstimate() const override; | 60 virtual bool HasReliableBandwidthEstimate() const override; |
60 virtual QuicTime::Delta RetransmissionDelay() const override; | 61 virtual QuicTime::Delta RetransmissionDelay() const override; |
61 virtual QuicByteCount GetCongestionWindow() const override; | 62 virtual QuicByteCount GetCongestionWindow() const override; |
62 virtual bool InSlowStart() const override; | 63 virtual bool InSlowStart() const override; |
63 virtual bool InRecovery() const override; | 64 virtual bool InRecovery() const override; |
64 virtual QuicByteCount GetSlowStartThreshold() const override; | 65 virtual QuicByteCount GetSlowStartThreshold() const override; |
65 virtual CongestionControlType GetCongestionControlType() const override; | 66 virtual CongestionControlType GetCongestionControlType() const override; |
66 | 67 |
67 private: | 68 private: |
68 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 69 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
69 QuicTime::Delta alarm_granularity_; | 70 QuicTime::Delta alarm_granularity_; |
70 uint32 initial_packet_burst_; | 71 uint32 initial_packet_burst_; |
71 mutable uint32 burst_tokens_; | 72 mutable uint32 burst_tokens_; |
72 // Send time of the last packet considered delayed. | 73 // Send time of the last packet considered delayed. |
73 QuicTime last_delayed_packet_sent_time_; | 74 QuicTime last_delayed_packet_sent_time_; |
74 QuicTime next_packet_send_time_; // When can the next packet be sent. | 75 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. | 76 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
76 | 77 |
77 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 78 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
78 }; | 79 }; |
79 | 80 |
80 } // namespace net | 81 } // namespace net |
81 | 82 |
82 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 83 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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