Struct ControllerSnapshot 

pub struct ControllerSnapshot {
    pub cwnd: u32,
    pub baseline_latency: Duration,
    pub current_latency: Duration,
    pub samples_seen: u64,
}

Read-only view of a controller’s internal state, intended for the progress bar and other observability surfaces.

Snapshots are sampled — never authoritative for enforcement. They expose the same fields a ratio-based controller reasons about (cwnd, baseline, current observed latency, sample count) so a renderer can show why the current cwnd is what it is. Controllers without a meaningful internal state (e.g. Noop) return ControllerSnapshot::default; controllers without a latency signal (e.g. Fixed) populate cwnd only and leave the latency fields at zero.

latency_ratio is intentionally not pre-computed — the renderer derives it from current_latency / baseline_latency so there is one source of truth.

Fields

cwnd: u32

Current concurrency window the controller would emit on its next tick. 0 means “no cap configured.”

baseline_latency: Duration

Long-horizon baseline latency. For ratio-based controllers this is the configured baseline percentile over the long sample window; the renderer treats it as the “uncongested floor” reference. Duration::ZERO if no signal yet.

current_latency: Duration

Short-horizon current latency. For ratio-based controllers this is the configured current percentile computed over the short sample window. Duration::ZERO if no fresh samples have been observed.

samples_seen: u64

Cumulative number of samples the controller has consumed.

Trait Implementations

impl Clone for ControllerSnapshot

fn clone(&self) -> ControllerSnapshot

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ControllerSnapshot

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ControllerSnapshot

fn default() -> ControllerSnapshot

Returns the “default value” for a type.

impl PartialEq for ControllerSnapshot

fn eq(&self, other: &ControllerSnapshot) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ControllerSnapshot

impl Eq for ControllerSnapshot

impl StructuralPartialEq for ControllerSnapshot