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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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53 virtual QuicTime::Delta TimeUntilSend( | 53 virtual QuicTime::Delta TimeUntilSend( |
54 QuicTime now, | 54 QuicTime now, |
55 QuicByteCount bytes_in_flight, | 55 QuicByteCount bytes_in_flight, |
56 HasRetransmittableData has_retransmittable_data) const OVERRIDE; | 56 HasRetransmittableData has_retransmittable_data) const OVERRIDE; |
57 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; | 57 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; |
58 virtual bool HasReliableBandwidthEstimate() const OVERRIDE; | 58 virtual bool HasReliableBandwidthEstimate() const OVERRIDE; |
59 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; | 59 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; |
60 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; | 60 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; |
61 virtual bool InSlowStart() const OVERRIDE; | 61 virtual bool InSlowStart() const OVERRIDE; |
62 virtual QuicByteCount GetSlowStartThreshold() const OVERRIDE; | 62 virtual QuicByteCount GetSlowStartThreshold() const OVERRIDE; |
| 63 virtual CongestionControlType GetCongestionControlType() const OVERRIDE; |
63 | 64 |
64 private: | 65 private: |
65 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 66 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
66 QuicTime::Delta alarm_granularity_; | 67 QuicTime::Delta alarm_granularity_; |
67 uint32 initial_packet_burst_; | 68 uint32 initial_packet_burst_; |
68 mutable uint32 burst_tokens_; | 69 mutable uint32 burst_tokens_; |
69 // Send time of the last packet considered delayed. | 70 // Send time of the last packet considered delayed. |
70 QuicTime last_delayed_packet_sent_time_; | 71 QuicTime last_delayed_packet_sent_time_; |
71 QuicTime next_packet_send_time_; // When can the next packet be sent. | 72 QuicTime next_packet_send_time_; // When can the next packet be sent. |
72 mutable bool was_last_send_delayed_; // True when the last send was delayed. | 73 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
73 bool has_valid_rtt_; // True if we have at least one RTT update. | 74 bool has_valid_rtt_; // True if we have at least one RTT update. |
74 | 75 |
75 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 76 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
76 }; | 77 }; |
77 | 78 |
78 } // namespace net | 79 } // namespace net |
79 | 80 |
80 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 81 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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