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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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| 52 virtual void RevertRetransmissionTimeout() OVERRIDE; | 52 virtual void RevertRetransmissionTimeout() OVERRIDE; |
| 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 bool InRecovery() const OVERRIDE; |
| 62 virtual QuicByteCount GetSlowStartThreshold() const OVERRIDE; | 63 virtual QuicByteCount GetSlowStartThreshold() const OVERRIDE; |
| 63 virtual CongestionControlType GetCongestionControlType() const OVERRIDE; | 64 virtual CongestionControlType GetCongestionControlType() const OVERRIDE; |
| 64 | 65 |
| 65 private: | 66 private: |
| 66 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 67 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
| 67 QuicTime::Delta alarm_granularity_; | 68 QuicTime::Delta alarm_granularity_; |
| 68 uint32 initial_packet_burst_; | 69 uint32 initial_packet_burst_; |
| 69 mutable uint32 burst_tokens_; | 70 mutable uint32 burst_tokens_; |
| 70 // Send time of the last packet considered delayed. | 71 // Send time of the last packet considered delayed. |
| 71 QuicTime last_delayed_packet_sent_time_; | 72 QuicTime last_delayed_packet_sent_time_; |
| 72 QuicTime next_packet_send_time_; // When can the next packet be sent. | 73 QuicTime next_packet_send_time_; // When can the next packet be sent. |
| 73 mutable bool was_last_send_delayed_; // True when the last send was delayed. | 74 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
| 74 bool has_valid_rtt_; // True if we have at least one RTT update. | 75 bool has_valid_rtt_; // True if we have at least one RTT update. |
| 75 | 76 |
| 76 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 77 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
| 77 }; | 78 }; |
| 78 | 79 |
| 79 } // namespace net | 80 } // namespace net |
| 80 | 81 |
| 81 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 82 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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