How to use the koop/lib.Cache function in koop

var https = require('https')
var util = require('util')

// set global number of sockets if in the config
// node version > 0.12 sets max sockets to infinity
if (config.sockets) {
  http.globalAgent.maxSockets = Math.floor(config.sockets / 2)
  https.globalAgent.maxSockets = Math.floor(config.sockets / 2)
}

// Init Koop with things it needs like a log and Cache
koop.log = new koop.Logger(config)
koop.Cache = new koop.DataCache(koop)

// registers a DB modules
koop.Cache.db = pgcache.connect(config.db.conn, koop)

// Create the job queue for this worker process
// connects to the redis same redis
var jobs = kue.createQueue({
  prefix: config.redis.prefix,
  redis: {
    port: config.redis.port,
    host: config.redis.host
  }
})

process.once('SIGINT', function (sig) {
  jobs.active(function (err, ids) {
    if (err) {
      koop.log.error(util.inspect(err))
    }

koop.GeoJSON.fromEsri(job.data.fields || [], json, function (err, geojson) {
        if (err) return callback(err)
        koop.Cache.insertPartial('agol', job.data.itemId, geojson, job.data.layerId, function (err) {
          if (err) {
            featureService.pageQueue.kill()
            koop.log.error('err')
            var error = new Error('Error inserting rows into the db')
            error.type = 'db'
            throw error
          }
          completed++
          koop.log.info(completed + ' pages of ' + len + ' completed. ' + job.id + ': ' + job.data.itemId + '_' + job.data.layerId)
          job.progress(completed, len)

          if (completed === len) {
            var key = ['agol', job.data.itemId, job.data.layerId].join(':')
            koop.Cache.getInfo(key, function (err, info) {
              if (err) throw err
              if (info && info.status) delete info.status