arthas 0.3.0

Arthas is an in-memory structure database.
Documentation 
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extern crate arthas;
extern crate mktemp;
extern crate rand;
extern crate env_logger;

use self::mktemp::Temp;
use std::sync::{Once, ONCE_INIT};
use rand::random;
use rand::distributions::{IndependentSample, Range};
use rand::Rng;

use std::collections::HashMap;
use std::iter::IntoIterator;
use std::cmp::Eq;
use std::hash::Hash;


pub fn setup() {
    static ONCE: Once = ONCE_INIT;

    ONCE.call_once(|| {
        config_env_logger();
        let temp_dir = Temp::new_dir().unwrap().to_path_buf();
        arthas::config::path(temp_dir);
    });
}


pub fn memory_setup() {
    static ONCE: Once = ONCE_INIT;

    ONCE.call_once(|| {
        config_env_logger();
        arthas::config::persistence(false);
    });
}

pub fn random_usize() -> usize {
    random::<usize>()
}

pub fn random_string() -> String {
    let len = random_usize_max(15);
    rand::thread_rng()
        .gen_iter::<char>()
        .take(len)
        .collect()
}

fn random_usize_max(max: usize) -> usize {
    let between = Range::new(0, max);
    let mut rng = rand::thread_rng();
    between.ind_sample(&mut rng)
}

fn config_env_logger() {
    env_logger::init().unwrap();
}

pub fn revert<K, V>(hash_map: HashMap<K, V>) -> HashMap<V, K>
    where HashMap<K, V>: IntoIterator<Item = (K, V)>,
          V: Eq + Hash
{
    let mut reverted_map = HashMap::new();

    for (k, v) in hash_map {
        reverted_map.insert(v, k);
    }

    reverted_map
}