1  'use strict';
 2  
 3  Object.defineProperty(exports, "__esModule", {
 4    value: true
 5  });
 6  exports.default = cargo;
 7  
 8  var _queue = require('./internal/queue');
 9  
10  var _queue2 = _interopRequireDefault(_queue);
11  
12  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
13  
14  /**
15   * Creates a `cargo` object with the specified payload. Tasks added to the
16   * cargo will be processed altogether (up to the `payload` limit). If the
17   * `worker` is in progress, the task is queued until it becomes available. Once
18   * the `worker` has completed some tasks, each callback of those tasks is
19   * called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
20   * for how `cargo` and `queue` work.
21   *
22   * While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
23   * at a time, cargo passes an array of tasks to a single worker, repeating
24   * when the worker is finished.
25   *
26   * @name cargo
27   * @static
28   * @memberOf module:ControlFlow
29   * @method
30   * @see [async.queue]{@link module:ControlFlow.queue}
31   * @category Control Flow
32   * @param {AsyncFunction} worker - An asynchronous function for processing an array
33   * of queued tasks. Invoked with `(tasks, callback)`.
34   * @param {number} [payload=Infinity] - An optional `integer` for determining
35   * how many tasks should be processed per round; if omitted, the default is
36   * unlimited.
37   * @returns {module:ControlFlow.QueueObject} A cargo object to manage the tasks. Callbacks can
38   * attached as certain properties to listen for specific events during the
39   * lifecycle of the cargo and inner queue.
40   * @example
41   *
42   * // create a cargo object with payload 2
43   * var cargo = async.cargo(function(tasks, callback) {
44   *     for (var i=0; i<tasks.length; i++) {
45   *         console.log('hello ' + tasks[i].name);
46   *     }
47   *     callback();
48   * }, 2);
49   *
50   * // add some items
51   * cargo.push({name: 'foo'}, function(err) {
52   *     console.log('finished processing foo');
53   * });
54   * cargo.push({name: 'bar'}, function(err) {
55   *     console.log('finished processing bar');
56   * });
57   * await cargo.push({name: 'baz'});
58   * console.log('finished processing baz');
59   */
60  function cargo(worker, payload) {
61    return (0, _queue2.default)(worker, 1, payload);
62  }
63  module.exports = exports['default'];