Struct CacheEntryStats 

pub struct CacheEntryStats {
    pub id: u64,
    pub hit_count: u32,
    pub last_hit_time_s: f64,
}

Per-entry stats the eviction policy needs. Caller (the F1/F3 cache layer) keeps these alongside each entry and passes a snapshot when capacity pressure triggers.

Fields

id: u64

Stable identifier for the entry (cache slot index, hash, SpecCacheKey index, etc). Pure pass-through - the policy only uses it to name which entries to evict.

hit_count: u32

Total hits since the entry was inserted.

last_hit_time_s: f64

Wall-clock time (seconds since epoch or any monotonic clock) the entry was last hit. Same clock reference as current_time_s.

Implementations

impl CacheEntryStats

pub fn heat(&self, current_time_s: f64) -> f64

Heat score: high = keep, low = evict. Combines frequency (hit_count) with recency via exponential half-life decay.

Trait Implementations

impl Clone for CacheEntryStats

fn clone(&self) -> CacheEntryStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CacheEntryStats

impl Debug for CacheEntryStats

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

Formats the value using the given formatter.