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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fmt::{self, Display};
use crate::{cc::classic_cc::SlowStart, packet, rtt::RttEstimate, stats::CongestionControlStats};
/// Classic slow start as described in RFC 9002.
///
/// > While a sender is in slow start, the congestion window increases by the number of bytes
/// > acknowledged when each acknowledgment is processed. This results in exponential growth of the
/// > congestion window.
///
#[derive(Debug, Default)]
pub struct ClassicSlowStart {}
impl Display for ClassicSlowStart {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ClassicSlowStart")
}
}
impl SlowStart for ClassicSlowStart {
fn on_packet_sent(&mut self, _sent_pn: packet::Number) {}
fn on_packets_acked(
&mut self,
_rtt_est: &RttEstimate,
_largest_acked: packet::Number,
_curr_cwnd: usize,
_cc_stats: &mut CongestionControlStats,
) -> Option<usize> {
// Classic slow start does not have any heuristic for exiting slow start. Always
// returns `None`.
None
}
}