// on application instance start, init near cache Map
const {Client, Config} = require('hazelcast-client')
const nearCachedMapName = 'my-holy-fast-map'

const cfg = new Config.NearCacheConfig()
cfg.name = nearCachedMapName
cfg.invalidateOnChange = true
cfg.nearCacheConfigs[nearCachedMapName] = cfg

const hazelcast = await Client.newHazelcastClient(cfg)
const locations = hazelcast.getMap(nearCachedMapName)

// on application instance start, fill map with locations once
if (await locations.size() === 0) {
  (await LocationsService.findAll()).forEach(location => {
    locations.put(location._id, location)
  })
}

// on location change
await locations.put(location._id, location)

// on locations retrieval "GET /locations"
await locations.values()