tableflip/piggybacker

Name: piggybacker

Owner: TABLEFLIP

Description: Async keyed job runner, piggyback on results from running jobs with the same key

Created: 2018-04-05 21:08:22.0

Updated: 2018-04-06 08:49:13.0

Pushed: 2018-04-06 08:49:10.0

Homepage: null

Size: 196

Language: JavaScript

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README

piggybacker

Async keyed job runner, piggyback on results from running jobs with the same key

Usage

rt { piggyback } from 'piggybacker'

c function fetchJSON (url) {
nst res = await window.fetch(url)
turn res.json()


t piggyFetchJSON = piggyback(
tchJSON,
 Given the args that will be passed to fetchJSON, generate a key so that if
 a second call is made while the first is in flight then the second will
 ALSO receive the results of the first, instead of having to make a
 separate request.
nction getKey (url) {
return url



t results = await Promise.all([
 Multiple calls to piggyFetchJSON with the same URL _while_ a request is in
 progress will not send another request! Instead they'll wait on the results
 of the first.
ggyFetchJSON('https://example.org/data.json'),
ggyFetchJSON('https://example.org/data.json'),
ggyFetchJSON('https://example.org/data.json')


etchJSON called only ONCE!

API

piggyback(fn, getKey)

Create a new function that'll call fn and piggyback on the results if called again.

• fn - the function to piggyback on
• getKey - a function called before each call to fn that generates a key for the call. Two or more calls with the same key will be piggybacked

Contribute

Feel free to dive in! Open an issue or submit PRs.

License

MIT © Alan Shaw