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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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50 HasRetransmittableData has_retransmittable_data) OVERRIDE; | 50 HasRetransmittableData has_retransmittable_data) OVERRIDE; |
51 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; | 51 virtual QuicBandwidth BandwidthEstimate() const OVERRIDE; |
52 virtual void OnRttUpdated(QuicPacketSequenceNumber largest_observed) OVERRIDE; | 52 virtual void OnRttUpdated(QuicPacketSequenceNumber largest_observed) OVERRIDE; |
53 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; | 53 virtual QuicTime::Delta RetransmissionDelay() const OVERRIDE; |
54 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; | 54 virtual QuicByteCount GetCongestionWindow() const OVERRIDE; |
55 | 55 |
56 private: | 56 private: |
57 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 57 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
58 QuicTime::Delta alarm_granularity_; | 58 QuicTime::Delta alarm_granularity_; |
59 QuicTime next_packet_send_time_; // When can the next packet be sent. | 59 QuicTime next_packet_send_time_; // When can the next packet be sent. |
60 bool was_last_send_delayed_; // True when the last send was delayed. | 60 bool was_last_send_delayed_; // True when the last send was delayed. |
61 bool updated_rtt_; // True if we have at least one RTT update. | 61 bool updated_rtt_; // True if we have at least one RTT update. |
62 | 62 |
63 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 63 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
64 }; | 64 }; |
65 | 65 |
66 } // namespace net | 66 } // namespace net |
67 | 67 |
68 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 68 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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