Trait StateMachine 

pub trait StateMachine: Send + Sync {
    // Required methods
    fn apply(&mut self, entry: &LogEntry) -> RaftResult<Vec<u8>>;
    fn snapshot(&self) -> RaftResult<Vec<u8>>;
    fn restore(&mut self, snapshot: &[u8]) -> RaftResult<()>;
}

Trait for state machines that can be driven by the Raft log.

Implementors receive committed log entries in order and produce deterministic outputs. They must also support snapshotting and restoring from a snapshot so that log compaction is possible.

Required Methods

fn apply(&mut self, entry: &LogEntry) -> RaftResult<Vec<u8>>

Apply a single committed log entry to the state machine.

Returns the output bytes produced by the command, or an error if application fails.

fn snapshot(&self) -> RaftResult<Vec<u8>>

Capture a point-in-time snapshot of the state machine.

fn restore(&mut self, snapshot: &[u8]) -> RaftResult<()>

Restore the state machine from a previously captured snapshot.

Implementors