Struct SlotCache 

pub struct SlotCache { /* private fields */ }

A fixed-capacity LRU set of resident groups over cap_slots byte slots.

Implementations

impl SlotCache

pub fn new(cap_slots: u32) -> Self

pub fn capacity(&self) -> u32

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

Bump slot to most-recently-used (call on every hit).

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

Plan a write of key. Overwrite-in-place if resident (no victim); else a free slot; else evict the LRU slot and report its group to flush down.

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

Partition request keys into T1 hits (request_index, slot) and misses (request_index). Read-only — the caller touches the hits after the copy so a failed copy doesn’t perturb LRU order.

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

Every resident (key, slot) — used to flush the whole cache on drop.