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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 <stdint.h> |
| 15 |
14 #include <map> | 16 #include <map> |
15 | 17 |
16 #include "base/basictypes.h" | 18 #include "base/macros.h" |
17 #include "base/memory/scoped_ptr.h" | 19 #include "base/memory/scoped_ptr.h" |
18 #include "net/quic/congestion_control/send_algorithm_interface.h" | 20 #include "net/quic/congestion_control/send_algorithm_interface.h" |
19 #include "net/quic/quic_bandwidth.h" | 21 #include "net/quic/quic_bandwidth.h" |
20 #include "net/quic/quic_config.h" | 22 #include "net/quic/quic_config.h" |
21 #include "net/quic/quic_protocol.h" | 23 #include "net/quic/quic_protocol.h" |
22 #include "net/quic/quic_time.h" | 24 #include "net/quic/quic_time.h" |
23 | 25 |
24 namespace net { | 26 namespace net { |
25 | 27 |
26 class NET_EXPORT_PRIVATE PacingSender : public SendAlgorithmInterface { | 28 class NET_EXPORT_PRIVATE PacingSender : public SendAlgorithmInterface { |
27 public: | 29 public: |
28 // Create a PacingSender to wrap the specified sender. |alarm_granularity| | 30 // Create a PacingSender to wrap the specified sender. |alarm_granularity| |
29 // indicates to the pacer to send that far into the future, since it should | 31 // indicates to the pacer to send that far into the future, since it should |
30 // not expect a callback before that time delta. |initial_packet_burst| is | 32 // not expect a callback before that time delta. |initial_packet_burst| is |
31 // the number of packets sent without pacing after quiescence. | 33 // the number of packets sent without pacing after quiescence. |
32 PacingSender(SendAlgorithmInterface* sender, | 34 PacingSender(SendAlgorithmInterface* sender, |
33 QuicTime::Delta alarm_granularity, | 35 QuicTime::Delta alarm_granularity, |
34 uint32 initial_packet_burst); | 36 uint32_t initial_packet_burst); |
35 ~PacingSender() override; | 37 ~PacingSender() override; |
36 | 38 |
37 // SendAlgorithmInterface methods. | 39 // SendAlgorithmInterface methods. |
38 void SetFromConfig(const QuicConfig& config, | 40 void SetFromConfig(const QuicConfig& config, |
39 Perspective perspective) override; | 41 Perspective perspective) override; |
40 void ResumeConnectionState( | 42 void ResumeConnectionState( |
41 const CachedNetworkParameters& cached_network_params, | 43 const CachedNetworkParameters& cached_network_params, |
42 bool max_bandwidth_resumption) override; | 44 bool max_bandwidth_resumption) override; |
43 void SetNumEmulatedConnections(int num_connections) override; | 45 void SetNumEmulatedConnections(int num_connections) override; |
44 void SetMaxCongestionWindow(QuicByteCount max_congestion_window) override; | 46 void SetMaxCongestionWindow(QuicByteCount max_congestion_window) override; |
(...skipping 21 matching lines...) Expand all Loading... |
66 QuicByteCount GetSlowStartThreshold() const override; | 68 QuicByteCount GetSlowStartThreshold() const override; |
67 CongestionControlType GetCongestionControlType() const override; | 69 CongestionControlType GetCongestionControlType() const override; |
68 // End implementation of SendAlgorithmInterface. | 70 // End implementation of SendAlgorithmInterface. |
69 | 71 |
70 private: | 72 private: |
71 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. | 73 scoped_ptr<SendAlgorithmInterface> sender_; // Underlying sender. |
72 // The estimated system alarm granularity. | 74 // The estimated system alarm granularity. |
73 const QuicTime::Delta alarm_granularity_; | 75 const QuicTime::Delta alarm_granularity_; |
74 // Configured maximum size of the burst coming out of quiescence. The burst | 76 // Configured maximum size of the burst coming out of quiescence. The burst |
75 // is never larger than the current CWND in packets. | 77 // is never larger than the current CWND in packets. |
76 const uint32 initial_packet_burst_; | 78 const uint32_t initial_packet_burst_; |
77 // Number of unpaced packets to be sent before packets are delayed. | 79 // Number of unpaced packets to be sent before packets are delayed. |
78 uint32 burst_tokens_; | 80 uint32_t burst_tokens_; |
79 // Send time of the last packet considered delayed. | 81 // Send time of the last packet considered delayed. |
80 QuicTime last_delayed_packet_sent_time_; | 82 QuicTime last_delayed_packet_sent_time_; |
81 QuicTime ideal_next_packet_send_time_; // When can the next packet be sent. | 83 QuicTime ideal_next_packet_send_time_; // When can the next packet be sent. |
82 mutable bool was_last_send_delayed_; // True when the last send was delayed. | 84 mutable bool was_last_send_delayed_; // True when the last send was delayed. |
83 | 85 |
84 DISALLOW_COPY_AND_ASSIGN(PacingSender); | 86 DISALLOW_COPY_AND_ASSIGN(PacingSender); |
85 }; | 87 }; |
86 | 88 |
87 } // namespace net | 89 } // namespace net |
88 | 90 |
89 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ | 91 #endif // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_ |
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