nut 0.1.1

Bolt DB Port in Rust
Documentation 
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use crate::tx::TxStats;
use std::ops::{AddAssign, Sub};

/// Stats represents statistics about the database.
#[derive(Clone, Debug)]
pub struct Stats {
    // Freelist stats
    /// total number of free pages on the freelist
    pub free_page_n: usize,
    /// total number of pending pages on the freelist
    pub pending_page_n: usize,
    /// total bytes allocated in free pages
    pub free_alloc: usize,
    /// total bytes used by the freelist
    pub freelist_in_use: usize,

    // Transaction stats
    /// total number of started read transactions
    pub tx_n: usize,
    /// number of currently open read transactions
    pub open_tx_n: usize,

    /// global, ongoing stats.
    pub tx_stats: TxStats,
}

impl Default for Stats {
    fn default() -> Self {
        Self {
            free_page_n: 0,
            pending_page_n: 0,
            free_alloc: 0,
            freelist_in_use: 0,
            tx_n: 0,
            open_tx_n: 0,
            tx_stats: Default::default(),
        }
    }
}

impl Sub for Stats {
    type Output = Stats;

    fn sub(self, other: Stats) -> Stats {
        Stats {
            free_page_n: self.free_page_n,
            pending_page_n: self.pending_page_n,
            free_alloc: self.free_alloc,
            freelist_in_use: self.freelist_in_use,
            tx_n: self.tx_n - other.tx_n,
            open_tx_n: self.open_tx_n - other.open_tx_n,
            tx_stats: self.tx_stats.sub(&other.tx_stats),
        }
    }
}

impl AddAssign for Stats {
    fn add_assign(&mut self, other: Stats) {
        self.tx_stats += other.tx_stats;
    }
}