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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 #ifndef NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | 5 #ifndef NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ |
6 #define NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | 6 #define NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ |
7 | 7 |
8 #include <algorithm> | 8 #include <algorithm> |
9 #include <map> | 9 #include <map> |
10 | 10 |
11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
12 #include "net/quic/congestion_control/loss_detection_interface.h" | 12 #include "net/quic/congestion_control/loss_detection_interface.h" |
13 #include "net/quic/quic_protocol.h" | 13 #include "net/quic/quic_protocol.h" |
14 #include "net/quic/quic_time.h" | 14 #include "net/quic/quic_time.h" |
15 #include "net/quic/quic_unacked_packet_map.h" | 15 #include "net/quic/quic_unacked_packet_map.h" |
16 | 16 |
17 namespace net { | 17 namespace net { |
18 | 18 |
19 // A loss detection algorithm which avoids spurious losses and retransmissions | 19 // A loss detection algorithm which avoids spurious losses and retransmissions |
20 // by waiting 1.25 RTTs after a packet was sent instead of nack count. | 20 // by waiting 1.25 RTTs after a packet was sent instead of nack count. |
21 class NET_EXPORT_PRIVATE TimeLossAlgorithm : public LossDetectionInterface { | 21 class NET_EXPORT_PRIVATE TimeLossAlgorithm : public LossDetectionInterface { |
22 public: | 22 public: |
23 TimeLossAlgorithm(); | 23 TimeLossAlgorithm(); |
24 virtual ~TimeLossAlgorithm() {} | 24 virtual ~TimeLossAlgorithm() {} |
25 | 25 |
26 virtual LossDetectionType GetLossDetectionType() const OVERRIDE; | 26 virtual LossDetectionType GetLossDetectionType() const override; |
27 | 27 |
28 // Declares pending packets less than the largest observed lost when it has | 28 // Declares pending packets less than the largest observed lost when it has |
29 // been 1.25 RTT since they were sent. Packets larger than the largest | 29 // been 1.25 RTT since they were sent. Packets larger than the largest |
30 // observed are retransmitted via TLP. | 30 // observed are retransmitted via TLP. |
31 virtual SequenceNumberSet DetectLostPackets( | 31 virtual SequenceNumberSet DetectLostPackets( |
32 const QuicUnackedPacketMap& unacked_packets, | 32 const QuicUnackedPacketMap& unacked_packets, |
33 const QuicTime& time, | 33 const QuicTime& time, |
34 QuicPacketSequenceNumber largest_observed, | 34 QuicPacketSequenceNumber largest_observed, |
35 const RttStats& rtt_stats) OVERRIDE; | 35 const RttStats& rtt_stats) override; |
36 | 36 |
37 // Returns the time the next packet will be lost, or zero if there | 37 // Returns the time the next packet will be lost, or zero if there |
38 // are no nacked pending packets outstanding. | 38 // are no nacked pending packets outstanding. |
39 // TODO(ianswett): Ideally the RTT variance and the RTT would be used to | 39 // TODO(ianswett): Ideally the RTT variance and the RTT would be used to |
40 // determine the time a packet is considered lost. | 40 // determine the time a packet is considered lost. |
41 // TODO(ianswett): Consider using Max(1.25 * srtt, 1.125 * last_rtt). | 41 // TODO(ianswett): Consider using Max(1.25 * srtt, 1.125 * last_rtt). |
42 virtual QuicTime GetLossTimeout() const OVERRIDE; | 42 virtual QuicTime GetLossTimeout() const override; |
43 | 43 |
44 private: | 44 private: |
45 QuicTime loss_detection_timeout_; | 45 QuicTime loss_detection_timeout_; |
46 | 46 |
47 DISALLOW_COPY_AND_ASSIGN(TimeLossAlgorithm); | 47 DISALLOW_COPY_AND_ASSIGN(TimeLossAlgorithm); |
48 }; | 48 }; |
49 | 49 |
50 } // namespace net | 50 } // namespace net |
51 | 51 |
52 #endif // NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | 52 #endif // NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ |
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