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// Copyright (c) 2014 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.
// Implements Proportional Rate Reduction (PRR) per RFC 6937.
#ifndef QUICHE_QUIC_CORE_CONGESTION_CONTROL_PRR_SENDER_H_
#define QUICHE_QUIC_CORE_CONGESTION_CONTROL_PRR_SENDER_H_
#include "net/third_party/quiche/src/quic/core/quic_bandwidth.h"
#include "net/third_party/quiche/src/quic/core/quic_time.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
namespace quic {
class QUIC_EXPORT_PRIVATE PrrSender {
public:
PrrSender();
// OnPacketLost should be called on the first loss that triggers a recovery
// period and all other methods in this class should only be called when in
// recovery.
void OnPacketLost(QuicByteCount prior_in_flight);
void OnPacketSent(QuicByteCount sent_bytes);
void OnPacketAcked(QuicByteCount acked_bytes);
bool CanSend(QuicByteCount congestion_window,
QuicByteCount bytes_in_flight,
QuicByteCount slowstart_threshold) const;
private:
// Bytes sent and acked since the last loss event.
// |bytes_sent_since_loss_| is the same as "prr_out_" in RFC 6937,
// and |bytes_delivered_since_loss_| is the same as "prr_delivered_".
QuicByteCount bytes_sent_since_loss_;
QuicByteCount bytes_delivered_since_loss_;
size_t ack_count_since_loss_;
// The congestion window before the last loss event.
QuicByteCount bytes_in_flight_before_loss_;
};
} // namespace quic
#endif // QUICHE_QUIC_CORE_CONGESTION_CONTROL_PRR_SENDER_H_
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