dynatrace-cordova-outsystems-plugin/node_modules/async-limiter/index.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

'use strict';

function Queue(options) {
  if (!(this instanceof Queue)) {
    return new Queue(options);
  }

  options = options || {};
  this.concurrency = options.concurrency || Infinity;
  this.pending = 0;
  this.jobs = [];
  this.cbs = [];
  this._done = done.bind(this);
}

var arrayAddMethods = [
  'push',
  'unshift',
  'splice'
];

arrayAddMethods.forEach(function(method) {
  Queue.prototype[method] = function() {
    var methodResult = Array.prototype[method].apply(this.jobs, arguments);
    this._run();
    return methodResult;
  };
});

Object.defineProperty(Queue.prototype, 'length', {
  get: function() {
    return this.pending + this.jobs.length;
  }
});

Queue.prototype._run = function() {
  if (this.pending === this.concurrency) {
    return;
  }
  if (this.jobs.length) {
    var job = this.jobs.shift();
    this.pending++;
    job(this._done);
    this._run();
  }

  if (this.pending === 0) {
    while (this.cbs.length !== 0) {
      var cb = this.cbs.pop();
      process.nextTick(cb);
    }
  }
};

Queue.prototype.onDone = function(cb) {
  if (typeof cb === 'function') {
    this.cbs.push(cb);
    this._run();
  }
};

function done() {
  this.pending--;
  this._run();
}

module.exports = Queue;