var LRU = require('lru-cache');

var i = 0;
var sets = 0;
var start = Date.now();
var last = Date.now();
var max = 8193; // 8192 is the magic number upper perf limit of plain objects
var maxAge = 1000 * 60 * 60 * 24;

var cache = new LRU({
  max: max,
  maxAge: maxAge
});

function next() {
  i++;
  if ((i % 5000) === 0) {
    var now = Date.now();
    var elapsed = now - start;
    console.log({
      elapsed: elapsed + " ms",
      duration: now - last,
      iteration: i,
      sets: sets
    });
    last = now;
  }

  var token = createToken(6);
  var val = cache.get(token);
  if (!val) {
    sets++;
    cache.set(token, createValue());
  }
  setImmediate(next);
}

var chars = 'abcdefg0987654321';
function createToken(len) {
  var ret = '';

  for (var i = 0; i < len; ++i) {
    var index = Math.random() * chars.length | 0;
    ret += chars[index];
  }

  return ret;
}

function createValue() {
  return {
    key: String(Math.random()),
    something: ['portal', 'amazing'],
    application: null
  }
}

next();