98 lines
3.0 KiB
JavaScript
98 lines
3.0 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 = function (worker, concurrency) {
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// Start with a normal queue
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var q = (0, _queue2.default)(worker, concurrency);
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// Override push to accept second parameter representing priority
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q.push = function (data, priority, callback) {
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if (callback == null) callback = _noop2.default;
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if (typeof callback !== 'function') {
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throw new Error('task callback must be a function');
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}
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q.started = true;
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if (!(0, _isArray2.default)(data)) {
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data = [data];
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}
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if (data.length === 0) {
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// call drain immediately if there are no tasks
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return (0, _setImmediate2.default)(function () {
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q.drain();
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});
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}
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priority = priority || 0;
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var nextNode = q._tasks.head;
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while (nextNode && priority >= nextNode.priority) {
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nextNode = nextNode.next;
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}
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for (var i = 0, l = data.length; i < l; i++) {
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var item = {
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data: data[i],
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priority: priority,
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callback: callback
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};
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if (nextNode) {
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q._tasks.insertBefore(nextNode, item);
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} else {
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q._tasks.push(item);
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}
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}
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(0, _setImmediate2.default)(q.process);
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};
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// Remove unshift function
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delete q.unshift;
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return q;
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};
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var _isArray = require('lodash/isArray');
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var _isArray2 = _interopRequireDefault(_isArray);
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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var _setImmediate = require('./setImmediate');
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var _setImmediate2 = _interopRequireDefault(_setImmediate);
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var _queue = require('./queue');
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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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module.exports = exports['default'];
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/**
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* The same as [async.queue]{@link module:ControlFlow.queue} only tasks are assigned a priority and
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* completed in ascending priority order.
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*
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* @name priorityQueue
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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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* @category Control Flow
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* @param {AsyncFunction} worker - An async function for processing a queued task.
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* If you want to handle errors from an individual task, pass a callback to
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* `q.push()`.
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* Invoked with (task, callback).
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* @param {number} concurrency - An `integer` for determining how many `worker`
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* functions should be run in parallel. If omitted, the concurrency defaults to
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* `1`. If the concurrency is `0`, an error is thrown.
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* @returns {module:ControlFlow.QueueObject} A priorityQueue object to manage the tasks. There are two
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* differences between `queue` and `priorityQueue` objects:
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* * `push(task, priority, [callback])` - `priority` should be a number. If an
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* array of `tasks` is given, all tasks will be assigned the same priority.
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* * The `unshift` method was removed.
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*/
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