Module store 

The StateStore trait and the in-memory reference implementation.

Structs

InMemoryStore

Single-node in-memory store: atomic counters behind a short transaction mutex that serializes check-and-spend so multi-key spends stay atomic.

Spend

One key/amount/limit entry in an atomic multi-dimensional spend.

Enums

StateError

State-layer errors.

Traits

StateStore

Atomic counter operations. Every mutation is atomic with respect to concurrent callers; try_spend is a single check-and-spend (never a read-then-write).