awty

"Are we there yet?", a timeout/interval utility for polling.

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awty
awty, Are We There Yet?, is a simplistic polling module for repeat checking on asynchrous tasks.
Build Status

Example

var awty = require('awty');
var poll = awty(function() {
  // perform check on a certain length task
  // return true if and when finished polling
});

poll(function() {
  console.log('finished polling');
});

Installation

Node

To install awty in a Node application use npm.
$ npm install awty

Browser

No tests available for the browser but you may try using it via webpack.
$ webpack index.js awty.js

Test

To run tests use npm.
$ npm install
$ npm test

Documentation

Basic Usage

awty takes a callback that will be called on each poll. Simply return true whenever the polling is finished. To start polling call the returned instance supplying a done callback.
poll.every(250) // every 250ms
    .ask(5);    // only poll check 5 times

// start polling
poll(function(fin) {
  if (fin) console.log('polling finished');
  else console.log('polling stopped unfinished');
});

Set the timeout for each poll by the every method, passing a number of ms each call should wait.
A poll limit can also be set by the ask method, just pass a maximum number the poll should call.

Async Usage

The callback that awty takes is also provided a next function as an argument. If the function uses the argument, it will wait until the next function is called.
Instead of returning, whether or not to stop needs to be provided as an argument to the next function.
var awty = require('awty');
var poll = awty(function(next) {
  setTimeout(function() {
    next(/* `true` if polling should be finished */);
  }, 100)
});

poll(function() {
  console.log('finished polling');
});

Incremental Polls

It possible to increment the timeout after each poll, using the incr method it will double the last timeout. Or supplying an number of ms to increment by.
poll.incr(); // 250, 500, 1000, 2000, 4000, ...

// or set ms

poll.incr(50); // 250, 300, 350, 400, 450, ...

API

awty(<poll>)

poll(<cb>)

poll.every(<ms>)

poll.ask(<num>)

poll.incr(<val>)

License

MIT
Copyright (c) 2014 Christopher Turner