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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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| 37 virtual void OnCongestionEvent(bool rtt_updated, | 37 virtual void OnCongestionEvent(bool rtt_updated, |
| 38 QuicByteCount bytes_in_flight, | 38 QuicByteCount bytes_in_flight, |
| 39 const CongestionMap& acked_packets, | 39 const CongestionMap& acked_packets, |
| 40 const CongestionMap& lost_packets) OVERRIDE; | 40 const CongestionMap& lost_packets) OVERRIDE; |
| 41 virtual bool OnPacketSent(QuicTime sent_time, | 41 virtual bool OnPacketSent(QuicTime sent_time, |
| 42 QuicByteCount bytes_in_flight, | 42 QuicByteCount bytes_in_flight, |
| 43 QuicPacketSequenceNumber sequence_number, | 43 QuicPacketSequenceNumber sequence_number, |
| 44 QuicByteCount bytes, | 44 QuicByteCount bytes, |
| 45 HasRetransmittableData is_retransmittable) OVERRIDE; | 45 HasRetransmittableData is_retransmittable) OVERRIDE; |
| 46 virtual void OnRetransmissionTimeout(bool packets_retransmitted) OVERRIDE; | 46 virtual void OnRetransmissionTimeout(bool packets_retransmitted) OVERRIDE; |
| 47 virtual void RevertRetransmissionTimeout() OVERRIDE; |
| 47 virtual QuicTime::Delta TimeUntilSend( | 48 virtual QuicTime::Delta TimeUntilSend( |
| 48 QuicTime now, | 49 QuicTime now, |
| 49 QuicByteCount bytes_in_flight, | 50 QuicByteCount bytes_in_flight, |
| 50 HasRetransmittableData has_retransmittable_data) const OVERRIDE; | 51 HasRetransmittableData has_retransmittable_data) const OVERRIDE; |
| 51 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; | 52 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; |
| 52 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; | 53 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; |
| 53 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; | 54 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; |
| 54 | 55 |
| 55 private: | 56 private: |
| 56 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 57 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
| 57 QuicTime::Delta alarm_granularity_; | 58 QuicTime::Delta alarm_granularity_; |
| 58 // Send time of the last packet considered delayed. | 59 // Send time of the last packet considered delayed. |
| 59 QuicTime last_delayed_packet_sent_time_; | 60 QuicTime last_delayed_packet_sent_time_; |
| 60 QuicTime next_packet_send_time_; // When can the next packet be sent. | 61 QuicTime next_packet_send_time_; // When can the next packet be sent. |
| 61 mutable bool was_last_send_delayed_; // True when the last send was delayed. | 62 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
| 62 bool has_valid_rtt_; // True if we have at least one RTT update. | 63 bool has_valid_rtt_; // True if we have at least one RTT update. |
| 63 | 64 |
| 64 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 65 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
| 65 }; | 66 }; |
| 66 | 67 |
| 67 } // namespace net | 68 } // namespace net |
| 68 | 69 |
| 69 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 70 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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