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Estimate

dig_peer_selector::quality

Struct Estimate 

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pub struct Estimate { /* private fields */ }
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A recency-weighted estimate of a scalar quantity (throughput bytes/s, or RTT ms) with an adaptive, volatility-derived smoothing factor — no baked decay constant (SPEC §3.2, §4.3).

Internally it tracks the EWMA mean and an EWMA of the absolute deviation (the volatility). The smoothing factor alpha for the next update is a function of the relative volatility: steadier streams get a smaller alpha (longer memory), volatile streams a larger alpha (faster decay). A sample-count bootstrap makes early estimates converge quickly, satisfying P-recency + convergence before enough history exists to measure volatility.

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impl Estimate

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pub const fn new() -> Self

A fresh estimate with no samples.

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pub fn value(&self) -> Option<f64>

The current estimated value, or None if no sample has been folded in yet.

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pub fn samples(&self) -> u64

The number of samples folded in (a confidence signal).

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pub fn relative_volatility(&self) -> f64

The observed relative volatility (coefficient of variation): the EWMA absolute deviation divided by the mean. 0.0 for a steady peer, growing as outcomes swing. Used both to drive the adaptive decay (§4.3) and as a tail-risk signal for P99 orientation (§4.4-C).

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pub fn observe(&mut self, sample: f64)

Fold a measured sample into the estimate, updating the mean, the observed volatility, and the sample count. This is the ONLY way an estimate moves (measured-only, SPEC §3.1, §9.2).

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pub fn seed_prior(&mut self, value: f64)

Seed a prior value without counting it as a measured sample (SPEC §3.3 connection-class prior). A prior is a starting point for a cold peer; the first real observe overrides it, so priors never cap a measured peer. samples stays 0 so the peer is still treated as cold for exploration purposes (SPEC §3.5).

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impl Clone for Estimate

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fn clone(&self) -> Estimate

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for Estimate

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impl Debug for Estimate

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

Formats the value using the given formatter. Read more
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impl Default for Estimate

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl PartialEq for Estimate

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for Estimate

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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