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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 that adds pacing on top of an another send algorithm. | 5 // A send algorithm that adds pacing on top of an another send algorithm. |
| 6 // It uses the underlying sender's pacing rate to schedule packets. | 6 // It uses the underlying sender's pacing rate to schedule packets. |
| 7 // It also takes into consideration the expected granularity of the underlying | 7 // It also takes into consideration the expected granularity of the underlying |
| 8 // alarm to ensure that alarms are not set too aggressively, and err towards | 8 // alarm to ensure that alarms are not set too aggressively, and err towards |
| 9 // sending packets too early instead of too late. | 9 // sending packets too early instead of too late. |
| 10 | 10 |
| 11 #ifndef NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 11 #ifndef NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
| 12 #define NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 12 #define NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
| 13 | 13 |
| 14 #include <map> | 14 #include <map> |
| 15 | 15 |
| 16 #include "base/basictypes.h" | 16 #include "base/basictypes.h" |
| 17 #include "base/memory/scoped_ptr.h" | 17 #include "base/memory/scoped_ptr.h" |
| 18 #include "net/quic/congestion_control/send_algorithm_interface.h" | 18 #include "net/quic/congestion_control/send_algorithm_interface.h" |
| 19 #include "net/quic/crypto/cached_network_parameters.h" | |
| 20 #include "net/quic/quic_bandwidth.h" | 19 #include "net/quic/quic_bandwidth.h" |
| 21 #include "net/quic/quic_config.h" | 20 #include "net/quic/quic_config.h" |
| 22 #include "net/quic/quic_protocol.h" | 21 #include "net/quic/quic_protocol.h" |
| 23 #include "net/quic/quic_time.h" | 22 #include "net/quic/quic_time.h" |
| 24 | 23 |
| 25 namespace net { | 24 namespace net { |
| 26 | 25 |
| 27 class NET_EXPORT_PRIVATE PacingSender : public SendAlgorithmInterface { | 26 class NET_EXPORT_PRIVATE PacingSender : public SendAlgorithmInterface { |
| 28 public: | 27 public: |
| 29 // Create a PacingSender to wrap the specified sender. |alarm_granularity| | 28 // Create a PacingSender to wrap the specified sender. |alarm_granularity| |
| 30 // indicates to the pacer to send that far into the future, since it should | 29 // indicates to the pacer to send that far into the future, since it should |
| 31 // not expect a callback before that time delta. |initial_packet_burst| is | 30 // not expect a callback before that time delta. |initial_packet_burst| is |
| 32 // the number of packets sent without pacing after quiescence. | 31 // the number of packets sent without pacing after quiescence. |
| 33 PacingSender(SendAlgorithmInterface* sender, | 32 PacingSender(SendAlgorithmInterface* sender, |
| 34 QuicTime::Delta alarm_granularity, | 33 QuicTime::Delta alarm_granularity, |
| 35 uint32 initial_packet_burst); | 34 uint32 initial_packet_burst); |
| 36 ~PacingSender() override; | 35 ~PacingSender() override; |
| 37 | 36 |
| 38 // SendAlgorithmInterface methods. | 37 // SendAlgorithmInterface methods. |
| 39 void SetFromConfig(const QuicConfig& config, | 38 void SetFromConfig(const QuicConfig& config, |
| 40 Perspective perspective, | 39 Perspective perspective) override; |
| 41 bool using_pacing) override; | |
| 42 bool ResumeConnectionState( | 40 bool ResumeConnectionState( |
| 43 const CachedNetworkParameters& cached_network_params, | 41 const CachedNetworkParameters& cached_network_params, |
| 44 bool max_bandwidth_resumption) override; | 42 bool max_bandwidth_resumption) override; |
| 45 void SetNumEmulatedConnections(int num_connections) override; | 43 void SetNumEmulatedConnections(int num_connections) override; |
| 46 void SetMaxCongestionWindow(QuicByteCount max_congestion_window) override; | 44 void SetMaxCongestionWindow(QuicByteCount max_congestion_window) override; |
| 47 void OnCongestionEvent(bool rtt_updated, | 45 void OnCongestionEvent(bool rtt_updated, |
| 48 QuicByteCount bytes_in_flight, | 46 QuicByteCount bytes_in_flight, |
| 49 const CongestionVector& acked_packets, | 47 const CongestionVector& acked_packets, |
| 50 const CongestionVector& lost_packets) override; | 48 const CongestionVector& lost_packets) override; |
| 51 bool OnPacketSent(QuicTime sent_time, | 49 bool OnPacketSent(QuicTime sent_time, |
| (...skipping 29 matching lines...) Expand all Loading... |
| 81 QuicTime last_delayed_packet_sent_time_; | 79 QuicTime last_delayed_packet_sent_time_; |
| 82 QuicTime ideal_next_packet_send_time_; // When can the next packet be sent. | 80 QuicTime ideal_next_packet_send_time_; // When can the next packet be sent. |
| 83 mutable bool was_last_send_delayed_; // True when the last send was delayed. | 81 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
| 84 | 82 |
| 85 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 83 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
| 86 }; | 84 }; |
| 87 | 85 |
| 88 } // namespace net | 86 } // namespace net |
| 89 | 87 |
| 90 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 88 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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