Struct SlotCache 

pub struct SlotCache { /* private fields */ }

2026-09-25: A fixed-capacity LRU set of resident groups over cap_slots slots.

Implementations

impl SlotCache

pub fn new(cap_slots: u32) -> Self

pub fn capacity(&self) -> u32

pub fn touch(&mut self, slot: u32)

2026-09-25: Make slot the most recently used. Callers pass occupied slots, from plan_read hits.

pub fn plan_write(&mut self, key: GroupKey) -> WritePlan

2026-09-25: Plan a write of key: its own slot if resident, else a free slot, else the least recently used slot, whose group is returned as the victim.

pub fn plan_read(&self, keys: &[GroupKey]) -> (Vec<(usize, u32)>, Vec<usize>)

2026-09-25: Split keys into hits (index, slot) and misses index, without changing LRU order; CascadeBackend touches each hit after queueing its copy.

pub fn residents(&self) -> Vec<(GroupKey, u32)>

2026-09-25: Every resident (key, slot).