kibana-123/src/ui/public/routes/work_queue.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

import _ from 'lodash';

function WorkQueue() {
  let q = this;

  let work = [];
  let fullDefers = [];

  q.limit = 0;
  Object.defineProperty(q, 'length', {
    get: function () {
      return work.length;
    }
  });

  let resolve = function (defers) {
    return defers.splice(0).map(function (defer) {
      return defer.resolve();
    });
  };

  let checkIfFull = function () {
    if (work.length >= q.limit && fullDefers.length) {
      resolve(fullDefers);
    }
  };

  q.resolveWhenFull = function (defer) {
    fullDefers.push(defer);
    checkIfFull();
  };

  q.doWork = function () {
    let resps = resolve(work);
    checkIfFull();
    return resps;
  };

  q.empty = function () {
    work.splice(0);
    checkIfFull();
  };

  q.push = function (defer) {
    work.push(defer);
    checkIfFull();
  };
}

export default WorkQueue;