Struct PredictionCache 

pub struct PredictionCache { /* private fields */ }

Bounded prediction cache with real hit-rate accounting.

The previous version stored a HashMap, a capacity and a hit_rate and never read or updated any of them.

Implementations

impl PredictionCache

pub fn new(capacity: usize) -> Self

Create a cache holding at most capacity entries (capacity == 0 disables caching entirely).

pub fn get(&mut self, key: &str) -> Option<PredictorOutput>

Look up a prediction, updating the hit/miss counters.

pub fn insert(&mut self, key: String, value: PredictorOutput)

Insert a prediction, evicting the oldest entry at capacity.

pub fn hit_rate(&self) -> f64

Observed hit rate, or 0 before any lookup.

pub fn len(&self) -> usize

Number of cached entries.

pub fn is_empty(&self) -> bool

Whether the cache holds nothing.

pub fn clear(&mut self)

Drop every entry (counters are preserved).

Trait Implementations

impl Clone for PredictionCache

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PredictionCache

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

Formats the value using the given formatter.