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[yaffs-website] / node_modules / uncss / node_modules / form-data / node_modules / async / cargo.js

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+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = cargo;
+
+var _queue = require('./internal/queue');
+
+var _queue2 = _interopRequireDefault(_queue);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * A cargo of tasks for the worker function to complete. Cargo inherits all of
+ * the same methods and event callbacks as [`queue`]{@link module:ControlFlow.queue}.
+ * @typedef {Object} CargoObject
+ * @memberOf module:ControlFlow
+ * @property {Function} length - A function returning the number of items
+ * waiting to be processed. Invoke like `cargo.length()`.
+ * @property {number} payload - An `integer` for determining how many tasks
+ * should be process per round. This property can be changed after a `cargo` is
+ * created to alter the payload on-the-fly.
+ * @property {Function} push - Adds `task` to the `queue`. The callback is
+ * called once the `worker` has finished processing the task. Instead of a
+ * single task, an array of `tasks` can be submitted. The respective callback is
+ * used for every task in the list. Invoke like `cargo.push(task, [callback])`.
+ * @property {Function} saturated - A callback that is called when the
+ * `queue.length()` hits the concurrency and further tasks will be queued.
+ * @property {Function} empty - A callback that is called when the last item
+ * from the `queue` is given to a `worker`.
+ * @property {Function} drain - A callback that is called when the last item
+ * from the `queue` has returned from the `worker`.
+ * @property {Function} idle - a function returning false if there are items
+ * waiting or being processed, or true if not. Invoke like `cargo.idle()`.
+ * @property {Function} pause - a function that pauses the processing of tasks
+ * until `resume()` is called. Invoke like `cargo.pause()`.
+ * @property {Function} resume - a function that resumes the processing of
+ * queued tasks when the queue is paused. Invoke like `cargo.resume()`.
+ * @property {Function} kill - a function that removes the `drain` callback and
+ * empties remaining tasks from the queue forcing it to go idle. Invoke like `cargo.kill()`.
+ */
+
+/**
+ * Creates a `cargo` object with the specified payload. Tasks added to the
+ * cargo will be processed altogether (up to the `payload` limit). If the
+ * `worker` is in progress, the task is queued until it becomes available. Once
+ * the `worker` has completed some tasks, each callback of those tasks is
+ * called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
+ * for how `cargo` and `queue` work.
+ *
+ * While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
+ * at a time, cargo passes an array of tasks to a single worker, repeating
+ * when the worker is finished.
+ *
+ * @name cargo
+ * @static
+ * @memberOf module:ControlFlow
+ * @method
+ * @see [async.queue]{@link module:ControlFlow.queue}
+ * @category Control Flow
+ * @param {Function} worker - An asynchronous function for processing an array
+ * of queued tasks, which must call its `callback(err)` argument when finished,
+ * with an optional `err` argument. Invoked with `(tasks, callback)`.
+ * @param {number} [payload=Infinity] - An optional `integer` for determining
+ * how many tasks should be processed per round; if omitted, the default is
+ * unlimited.
+ * @returns {module:ControlFlow.CargoObject} A cargo object to manage the tasks. Callbacks can
+ * attached as certain properties to listen for specific events during the
+ * lifecycle of the cargo and inner queue.
+ * @example
+ *
+ * // create a cargo object with payload 2
+ * var cargo = async.cargo(function(tasks, callback) {
+ *     for (var i=0; i<tasks.length; i++) {
+ *         console.log('hello ' + tasks[i].name);
+ *     }
+ *     callback();
+ * }, 2);
+ *
+ * // add some items
+ * cargo.push({name: 'foo'}, function(err) {
+ *     console.log('finished processing foo');
+ * });
+ * cargo.push({name: 'bar'}, function(err) {
+ *     console.log('finished processing bar');
+ * });
+ * cargo.push({name: 'baz'}, function(err) {
+ *     console.log('finished processing baz');
+ * });
+ */
+function cargo(worker, payload) {
+  return (0, _queue2.default)(worker, 1, payload);
+}
+module.exports = exports['default'];
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