You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: active_stats.rs
    path of file: ./repos/solana/accounts-db/src
    
    the code of the file until where you have to start completion: //! keep track of areas of the validator that are currently active
use std::sync::atomic::{AtomicUsize, Ordering};

/// counters of different areas of a validator which could be active
#[derive(Debug, Default)]
pub struct ActiveStats {
    clean: AtomicUsize,
    squash_ancient: AtomicUsize,
    shrink: AtomicUsize,
    hash: AtomicUsize,
    flush: AtomicUsize,
    hash_scan: AtomicUsize,
    hash_dedup: AtomicUsize,
    hash_merkle: AtomicUsize,
}

#[derive(Debug, Copy, Clone)]
pub enum ActiveStatItem {
    Clean,
    Shrink,
    SquashAncient,
    Hash,
    Flush,
    HashScan,
    HashDeDup,
    HashMerkleTree,
}

/// sole purpose is to 
    
    fn update_and_log(&self, item: ActiveStatItem, modify_stat: impl Fn(&AtomicUsize) -> usize) {
        let stat = match item {
            ActiveStatItem::Clean => &self.clean,
            ActiveStatItem::Shrink => &self.shrink,
            ActiveStatItem::SquashAncient => &self.squash_ancient,
            ActiveStatItem::Hash => &self.hash,
            ActiveStatItem::Flush => &self.flush,
            ActiveStatItem::HashDeDup => &self.hash_dedup,
            ActiveStatItem::HashMerkleTree => &self.hash_merkle,
            ActiveStatItem::HashScan => &self.hash_scan,
        };
        let value = modify_stat(stat);
        match item {
            ActiveStatItem::Clean => datapoint_info!("accounts_db_active", ("clean", value, i64)),
            ActiveStatItem::SquashAncient => {
                datapoint_info!("accounts_db_active", ("squash_ancient", value, i64))
            }
            ActiveStatItem::Shrink => {
                datapoint_info!("accounts_db_active", ("shrink", value, i64))
            }
            ActiveStatItem::Hash => datapoint_info!("accounts_db_active", ("hash", value, i64)),
            ActiveStatItem::Flush => datapoint_info!("accounts_db_active", ("flush", value, i64)),
            ActiveStatItem::HashDeDup => {
                datapoint_info!("accounts_db_active", ("hash_dedup", value, i64))
            }
            ActiveStatItem::HashMerkleTree => {
                datapoint_info!("accounts_db_active", ("hash_merkle_tree", value, i64))
            }
            ActiveStatItem::HashScan => {
                datapoint_info!("accounts_db_active", ("hash_scan", value, i64))
            }
        };
    }