small-db 0.4.0

A small database writing in rust, inspired from mit 6.830
Documentation 
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use std::{
    collections::HashMap,
    sync::{Arc, RwLock},
};

use super::{table::BTreeTable, tuple::Schema};
use crate::utils::HandyRwLock;

pub struct Catalog {
    map: HashMap<Key, Value>,
}

type Key = u32;
type Value = Arc<RwLock<BTreeTable>>;

impl Catalog {
    pub fn new() -> Self {
        Self {
            map: HashMap::new(),
        }
    }

    pub fn get_table(&self, table_index: &Key) -> Option<&Value> {
        self.map.get(table_index)
    }

    pub fn get_tuple_scheme(
        &self,
        table_index: &Key,
    ) -> Option<Schema> {
        let table_rc = self.map.get(table_index);
        match table_rc {
            Some(table_rc) => {
                let table = table_rc.rl();
                Some(table.get_tuple_scheme())
            }
            None => None,
        }
    }

    pub fn add_table(&mut self, file: Value) {
        self.map.insert(file.rl().get_id(), Arc::clone(&file));
    }
}