L1L2Cache

this module is a helper to aid a consume two layers cache

dependencies

• redis

usage

  /* config to point a instance of redis */
  const config = {
    url: "redis://localhost"
  }

  /* when cache value is not found, this callback was update*/
  const updateCallback = function*(l1, l2) {
    // ... update logic, send to a queue or update here
  }

  const l2Cache = new L2Cache(config, updateCallback)

  /* first time cache value is not found*/
  const ad = l2Cache.get("http://api.example.com/ads/abc")
  /* null */

  /* in second time, value already was updated */
  const ad = l2Cache.get("http://api.example.com/ads/abc")
  /* {
    id: "abc",
    cpc: 0.4
  } */