memcache-client-memoizer

memcache-client-memoizer

A function memoizer using memcache-client.

Install:

npm i memcache-client-memoizer

Note:

Rejected promises and callbacks called with an err argument are not memoized, since that's a pretty bad idea :)

Promise Memoization

memoizer(options)

Arguments

• options: object. Required. An object with the following keys:
  • client: memcache-client instance. Required. A memcache-client instance.
  • fn: Function. Required. The function to memoize, must return a Promise.
  • keyFn: (args to fn) => 'key-string'. Required. A function which returns a string cache-key for memcached. This function is called with the same arguments as fn, allowing you to create a dynamic cache-key, for example:

  const exampleKeyFn = ({ name, color }) => `${name}:${color}`

Example:

const MemcacheClient = require('memcache-client')
const memoizer = require('memcache-client-memoizer')

const client = new MemcacheClient({ server: 'localhost:11211' })
const fnToMemoize = ({ name, color }) => Promise.resolve(input)

const memoizedFn = memoizer({
  client,
  fn: fnToMemoize,
  keyFn: ({ name, color }) => `${name}:${color}`
})

memoizedFn({name: 'Max', color: 'blue'})
  .then((result) => { ... })  // cache miss, fill cache, returns {name: 'Max', color: 'blue'}

// later on...
memoizedFn({name: 'Max', color: 'blue'})
  .then((result) => { ... })  // cache hit, returns {name: 'Max', color: 'blue'}