Move shared files in net/quic/ into net/quic/core/

net/quic/congestion_control/send_algorithm_interface.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-// The pure virtual class for send side congestion control algorithm.
-
-#ifndef NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_
-#define NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_
-
-#include <algorithm>
-#include <map>
-
-#include "net/base/net_export.h"
-#include "net/quic/quic_bandwidth.h"
-#include "net/quic/quic_clock.h"
-#include "net/quic/quic_config.h"
-#include "net/quic/quic_connection_stats.h"
-#include "net/quic/quic_protocol.h"
-#include "net/quic/quic_time.h"
-
-namespace net {
-
-class CachedNetworkParameters;
-class RttStats;
-
-const QuicPacketCount kDefaultMaxCongestionWindowPackets = 2000;
-
-class NET_EXPORT_PRIVATE SendAlgorithmInterface {
- public:
-  // A sorted vector of packets.
-  typedef std::vector<std::pair<QuicPacketNumber, QuicPacketLength>>
-      CongestionVector;
-
-  static SendAlgorithmInterface* Create(
-      const QuicClock* clock,
-      const RttStats* rtt_stats,
-      CongestionControlType type,
-      QuicConnectionStats* stats,
-      QuicPacketCount initial_congestion_window);
-
-  virtual ~SendAlgorithmInterface() {}
-
-  virtual void SetFromConfig(const QuicConfig& config,
-                             Perspective perspective) = 0;
-
-  // Sets the number of connections to emulate when doing congestion control,
-  // particularly for congestion avoidance.  Can be set any time.
-  virtual void SetNumEmulatedConnections(int num_connections) = 0;
-
-  // Indicates an update to the congestion state, caused either by an incoming
-  // ack or loss event timeout.  |rtt_updated| indicates whether a new
-  // latest_rtt sample has been taken, |byte_in_flight| the bytes in flight
-  // prior to the congestion event.  |acked_packets| and |lost_packets| are
-  // any packets considered acked or lost as a result of the congestion event.
-  virtual void OnCongestionEvent(bool rtt_updated,
-                                 QuicByteCount bytes_in_flight,
-                                 const CongestionVector& acked_packets,
-                                 const CongestionVector& lost_packets) = 0;
-
-  // Inform that we sent |bytes| to the wire, and if the packet is
-  // retransmittable. Returns true if the packet should be tracked by the
-  // congestion manager and included in bytes_in_flight, false otherwise.
-  // |bytes_in_flight| is the number of bytes in flight before the packet was
-  // sent.
-  // Note: this function must be called for every packet sent to the wire.
-  virtual bool OnPacketSent(QuicTime sent_time,
-                            QuicByteCount bytes_in_flight,
-                            QuicPacketNumber packet_number,
-                            QuicByteCount bytes,
-                            HasRetransmittableData is_retransmittable) = 0;
-
-  // Called when the retransmission timeout fires.  Neither OnPacketAbandoned
-  // nor OnPacketLost will be called for these packets.
-  virtual void OnRetransmissionTimeout(bool packets_retransmitted) = 0;
-
-  // Called when connection migrates and cwnd needs to be reset.
-  virtual void OnConnectionMigration() = 0;
-
-  // Calculate the time until we can send the next packet.
-  virtual QuicTime::Delta TimeUntilSend(
-      QuicTime now,
-      QuicByteCount bytes_in_flight) const = 0;
-
-  // The pacing rate of the send algorithm.  May be zero if the rate is unknown.
-  virtual QuicBandwidth PacingRate(QuicByteCount bytes_in_flight) const = 0;
-
-  // What's the current estimated bandwidth in bytes per second.
-  // Returns 0 when it does not have an estimate.
-  virtual QuicBandwidth BandwidthEstimate() const = 0;
-
-  // Get the send algorithm specific retransmission delay, called RTO in TCP,
-  // Note 1: the caller is responsible for sanity checking this value.
-  // Note 2: this will return zero if we don't have enough data for an estimate.
-  virtual QuicTime::Delta RetransmissionDelay() const = 0;
-
-  // Returns the size of the current congestion window in bytes.  Note, this is
-  // not the *available* window.  Some send algorithms may not use a congestion
-  // window and will return 0.
-  virtual QuicByteCount GetCongestionWindow() const = 0;
-
-  // Whether the send algorithm is currently in slow start.  When true, the
-  // BandwidthEstimate is expected to be too low.
-  virtual bool InSlowStart() const = 0;
-
-  // Whether the send algorithm is currently in recovery.
-  virtual bool InRecovery() const = 0;
-
-  // Returns the size of the slow start congestion window in bytes,
-  // aka ssthresh.  Some send algorithms do not define a slow start
-  // threshold and will return 0.
-  virtual QuicByteCount GetSlowStartThreshold() const = 0;
-
-  virtual CongestionControlType GetCongestionControlType() const = 0;
-
-  // Called by the Session when we get a bandwidth estimate from the client.
-  // Uses the max bandwidth in the params if |max_bandwidth_resumption| is true.
-  virtual void ResumeConnectionState(
-      const CachedNetworkParameters& cached_network_params,
-      bool max_bandwidth_resumption) = 0;
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_