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//! Implementation of the Fixed Window congestion control algorithm.
//!
//! This is used by the circuit reactor in order to decide when to send data and SENDMEs.
//!
//! The vanilla flow control system of fixed window SENDMEs in the spec.
use crate::Result;
use super::{
rtt::RoundtripTimeEstimator,
sendme::{self, WindowParams},
CongestionControlAlgorithm, CongestionSignals, CongestionWindow, State,
};
/// Fixed window algorithm which is essentially the SENDME v0 with fixed receive and send window
/// size.
#[derive(Clone, Debug)]
pub(crate) struct FixedWindow {
/// Window used to say how many cells we can receive.
recvwindow: sendme::CircRecvWindow,
/// Window used to say how many cells we can send.
sendwindow: sendme::CircSendWindow,
}
impl FixedWindow {
/// Create a new `FixedWindow` form a given initial sendwindow size.
///
/// Note: the initial recvwindow size is given by [`sendme::CircParams::start`].
pub(crate) fn new(initial_window: u16) -> Self {
Self {
recvwindow: sendme::CircRecvWindow::new(sendme::CircParams::start()),
sendwindow: sendme::CircSendWindow::new(initial_window),
}
}
}
impl CongestionControlAlgorithm for FixedWindow {
fn is_next_cell_sendme(&self) -> bool {
self.sendwindow.should_record_tag()
}
fn can_send(&self) -> bool {
self.sendwindow.window() > 0
}
fn cwnd(&self) -> Option<&CongestionWindow> {
None
}
fn sendme_received(
&mut self,
_state: &mut State,
_rtt: &mut RoundtripTimeEstimator,
_signals: CongestionSignals,
) -> Result<()> {
self.sendwindow.put()
}
fn sendme_sent(&mut self) -> Result<()> {
self.recvwindow.put();
Ok(())
}
fn data_received(&mut self) -> Result<bool> {
self.recvwindow.take()
}
fn data_sent(&mut self) -> Result<()> {
self.sendwindow.take()
}
#[cfg(test)]
fn send_window(&self) -> u32 {
u32::from(self.sendwindow.window())
}
}
|
