@appigram/keyv-lru/lib/KeyvLru.js

An in-memory LRU back-end for Keyv.

"use strict";

const lru = require('tiny-lru');

const EventEmitter = require('events');
/**
 * An adaptor from tiny-lru to a Map API.
 */


class KeyvLru extends EventEmitter {
  // @TODO: Type this in a less generic way.
  constructor(options = {
    max: 500
  }) {
    super();
    this.defaultTtl = options.ttl;
    this.cache = lru(options.max, this.defaultTtl);
  }

  clear() {
    this.cache.clear();
  }

  delete(key) {
    const removed = this.cache.delete(key);
    return typeof removed !== 'undefined';
  }

  get(key) {
    return this.cache.get(key);
  }

  set(key, value) {
    this.cache.set(key, value);
    return 1;
  }

}

module.exports = KeyvLru;