Struct DatabaseStateMachine 

pub struct DatabaseStateMachine<F: DatabaseOperationHandler> { /* private fields */ }

A state machine that delegates operations to the actual database storage. This allows Raft to replicate real database operations.

Implementations

impl<F: DatabaseOperationHandler> DatabaseStateMachine<F>

pub fn new(handler: F) -> Self

Create a new database state machine with the given operation handler.

Trait Implementations

impl<F: DatabaseOperationHandler> StateMachineBackend for DatabaseStateMachine<F>

fn apply(&self, command: &Command, index: u64) -> CommandResult

Apply a command to the state machine at the given log index.

fn get(&self, key: &str) -> Option<Vec<u8>>

Get a value by key.

fn last_applied(&self) -> u64

Get the last applied log index.

fn version(&self) -> u64

Get the current version/sequence number.

fn len(&self) -> usize

Get the number of keys stored.

fn snapshot(&self) -> Snapshot

Take a snapshot of the current state.

fn restore(&self, snapshot: Snapshot)

Restore state from a snapshot.

fn is_empty(&self) -> bool

Check if the state machine is empty.