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 `cargoQueue` object with the specified payload. Tasks added to the
16   * cargoQueue will be processed together (up to the `payload` limit) in `concurrency` parallel workers.
17   * If the all `workers` are in progress, the task is queued until one becomes available. Once
18   * a `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, and [`cargo`]{@link module:ControlFlow.cargo} passes an array of tasks to a single worker,
24   * the cargoQueue passes an array of tasks to multiple parallel workers.
25   *
26   * @name cargoQueue
27   * @static
28   * @memberOf module:ControlFlow
29   * @method
30   * @see [async.queue]{@link module:ControlFlow.queue}
31   * @see [async.cargo]{@link module:ControlFLow.cargo}
32   * @category Control Flow
33   * @param {AsyncFunction} worker - An asynchronous function for processing an array
34   * of queued tasks. Invoked with `(tasks, callback)`.
35   * @param {number} [concurrency=1] - An `integer` for determining how many
36   * `worker` functions should be run in parallel.  If omitted, the concurrency
37   * defaults to `1`.  If the concurrency is `0`, an error is thrown.
38   * @param {number} [payload=Infinity] - An optional `integer` for determining
39   * how many tasks should be processed per round; if omitted, the default is
40   * unlimited.
41   * @returns {module:ControlFlow.QueueObject} A cargoQueue object to manage the tasks. Callbacks can
42   * attached as certain properties to listen for specific events during the
43   * lifecycle of the cargoQueue and inner queue.
44   * @example
45   *
46   * // create a cargoQueue object with payload 2 and concurrency 2
47   * var cargoQueue = async.cargoQueue(function(tasks, callback) {
48   *     for (var i=0; i<tasks.length; i++) {
49   *         console.log('hello ' + tasks[i].name);
50   *     }
51   *     callback();
52   * }, 2, 2);
53   *
54   * // add some items
55   * cargoQueue.push({name: 'foo'}, function(err) {
56   *     console.log('finished processing foo');
57   * });
58   * cargoQueue.push({name: 'bar'}, function(err) {
59   *     console.log('finished processing bar');
60   * });
61   * cargoQueue.push({name: 'baz'}, function(err) {
62   *     console.log('finished processing baz');
63   * });
64   * cargoQueue.push({name: 'boo'}, function(err) {
65   *     console.log('finished processing boo');
66   * });
67   */
68  function cargo(worker, concurrency, payload) {
69    return (0, _queue2.default)(worker, concurrency, payload);
70  }
71  module.exports = exports['default'];