Struct DecayingCounter 

pub struct DecayingCounter { /* private fields */ }

A single exponentially-weighted decaying accumulator. See the module docs for the r · τ steady-state interpretation.

Implementations

impl DecayingCounter

pub fn new(time_constant: DurationMillis) -> Self

Create an empty counter with the given decay time constant τ.

pub fn record(&mut self, now: TimeMillis, count: u64)

Decay the stored value forward to now, then add count events.

pub fn estimate(&self, now: TimeMillis) -> f64

The decayed accumulator at now — an estimate of the number of events in roughly the last τ. Does not mutate, so repeated calls at the same now are stable.

Trait Implementations

impl Clone for DecayingCounter

fn clone(&self) -> DecayingCounter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DecayingCounter

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

Formats the value using the given formatter.