Struct Voter 

pub struct Voter<S>
where
    S: LastVoteStore,
{ /* private fields */ }

A voting member. Wraps the durable LastVoteStore and applies the vote rule. The voter is the seat of correctness: the watermark rule and the durable double-vote guard both live here.

Implementations

impl<S> Voter<S>

where S: LastVoteStore,

pub fn new(id: impl Into<String>, store: S) -> Voter<S>

pub fn id(&self) -> &str

pub fn current_term(&self) -> Result<u64, LastVoteError>

This voter’s current term — the highest term it has durably recorded.

pub fn consider( &self, req: &VoteRequest, commit_watermark: u64, ) -> Result<VoteDecision, LastVoteError>

Consider a vote request against the current commit_watermark.

The decision order is deliberate:

1. Watermark first — the safety core. A candidate that cannot carry an acknowledged write is refused regardless of term, so the durability guarantee can never be traded away for liveness.
2. Stale term — reject candidates from a superseded term.
3. Double-vote guard — within a term, a voter grants exactly one candidate; a re-ask by the same candidate is idempotently re-granted.

For a real (non-dry-run) grant, the new (term, candidate) is persisted before Granted is returned, so the durability holds across a crash at any point after the caller observes the grant.