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use super::LogId;

/// The state about logs.
///
/// Invariance: last_purged_log_id <= last_applied <= last_log_id
#[derive(Clone, Debug, Default, PartialEq, Eq)]
pub struct LogState {
    /// The greatest log id that has been purged after being applied to state machine.
    pub last_purged_log_id: Option<LogId>,

    /// The log id of the last present entry if there are any entries.
    /// Otherwise the same value as `last_purged_log_id`.
    pub last_log_id: Option<LogId>,
}