71 lines
3.3 KiB
JavaScript
71 lines
3.3 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = cargo;
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var _queue = require('./internal/queue.js');
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var _queue2 = _interopRequireDefault(_queue);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Creates a `cargoQueue` object with the specified payload. Tasks added to the
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* cargoQueue will be processed together (up to the `payload` limit) in `concurrency` parallel workers.
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* If the all `workers` are in progress, the task is queued until one becomes available. Once
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* a `worker` has completed some tasks, each callback of those tasks is
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* called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
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* for how `cargo` and `queue` work.
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*
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* While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
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* at a time, and [`cargo`]{@link module:ControlFlow.cargo} passes an array of tasks to a single worker,
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* the cargoQueue passes an array of tasks to multiple parallel workers.
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*
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* @name cargoQueue
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @see [async.queue]{@link module:ControlFlow.queue}
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* @see [async.cargo]{@link module:ControlFLow.cargo}
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* @category Control Flow
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* @param {AsyncFunction} worker - An asynchronous function for processing an array
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* of queued tasks. Invoked with `(tasks, callback)`.
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* @param {number} [concurrency=1] - An `integer` for determining how many
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* `worker` functions should be run in parallel. If omitted, the concurrency
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* defaults to `1`. If the concurrency is `0`, an error is thrown.
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* @param {number} [payload=Infinity] - An optional `integer` for determining
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* how many tasks should be processed per round; if omitted, the default is
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* unlimited.
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* @returns {module:ControlFlow.QueueObject} A cargoQueue object to manage the tasks. Callbacks can
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* attached as certain properties to listen for specific events during the
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* lifecycle of the cargoQueue and inner queue.
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* @example
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*
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* // create a cargoQueue object with payload 2 and concurrency 2
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* var cargoQueue = async.cargoQueue(function(tasks, callback) {
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* for (var i=0; i<tasks.length; i++) {
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* console.log('hello ' + tasks[i].name);
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* }
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* callback();
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* }, 2, 2);
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*
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* // add some items
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* cargoQueue.push({name: 'foo'}, function(err) {
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* console.log('finished processing foo');
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* });
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* cargoQueue.push({name: 'bar'}, function(err) {
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* console.log('finished processing bar');
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* });
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* cargoQueue.push({name: 'baz'}, function(err) {
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* console.log('finished processing baz');
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* });
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* cargoQueue.push({name: 'boo'}, function(err) {
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* console.log('finished processing boo');
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* });
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*/
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function cargo(worker, concurrency, payload) {
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return (0, _queue2.default)(worker, concurrency, payload);
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}
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module.exports = exports['default'];
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