jugger

utilities to handle concurrent or periodic tasks, replacing setInterval or setTimer

Installation

Install with npm install jugger, then use it in your node or frontend projects like this:

const jugger = require('jugger');

jugger.interval(() => {
  console.log('ping');
}, 1000);

API

interval(fn, ms, options)

• fn(control) - the function that is run periodically
• ms - how many milliseconds between each invocation
• options - not implemented yet
• returns a control object

interval is similar to javascript setInterval(), but more user friendly. It has the following features:

• It will wait for the previous invocation to finish before invoking the next, preventing multiple invocations running concurrently causing race conditions
• It handles both regular functions and async functions
• It catches exceptions so they do not kill the interval timer
• The wait period can be dynamically controlled

const jugger = require('jugger');

const interval1 = jugger.interval(async (control) => {
  // periodically poll a remove service,
  // if the service returns result, display the result
  // else delay the next invocation
  const result = await someService();
  if (result != null) {
    console.log(result);
  } else {
    control.wait(60000);
  }
}, 5000);