Struct SampledStat 

pub struct SampledStat { /* private fields */ }

A SampledStat records a single scalar value measured over one or more samples. Each sample is recorded over a configurable window. The window can be defined by number of events or elapsed time (or both, if both are given the window is complete when either the event count or elapsed time criterion is met).

All the samples are combined to produce the measurement. When a window is complete the oldest sample is cleared and recycled to begin recording the next sample.

The mutable sample ring + cursor are guarded by a single Mutex mirroring Java’s sensor synchronized. This lock is taken per-fetch / per-partition, never per-record on the hot path (CLAUDE.md §13/§27).

Implementations

impl SampledStat

pub fn new(initial_value: f64, kind: Box<dyn SampledStatKind>) -> Self

Create a SampledStat with the given initial value and per-subclass behaviour.

Trait Implementations

impl Measurable for SampledStat

fn measure(&self, config: &MetricConfig, now: i64) -> f64

Measure this quantity and return the result as an f64.

impl Stat for SampledStat

fn record(&self, config: &MetricConfig, value: f64, time_ms: i64)

Record the given value.