86 lines
2.6 KiB
JavaScript
86 lines
2.6 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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var {
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push,
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pushAsync
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} = q;
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q._tasks = new _Heap2.default();
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q._createTaskItem = ({ data, priority }, callback) => {
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return {
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data,
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priority,
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callback
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};
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};
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function createDataItems(tasks, priority) {
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if (!Array.isArray(tasks)) {
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return { data: tasks, priority };
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}
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return tasks.map(data => {
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return { data, priority };
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});
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}
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// Override push to accept second parameter representing priority
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q.push = function (data, priority = 0, callback) {
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return push(createDataItems(data, priority), callback);
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};
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q.pushAsync = function (data, priority = 0, callback) {
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return pushAsync(createDataItems(data, priority), callback);
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};
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// Remove unshift functions
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delete q.unshift;
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delete q.unshiftAsync;
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return q;
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};
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var _queue = require('./queue.js');
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var _queue2 = _interopRequireDefault(_queue);
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var _Heap = require('./internal/Heap.js');
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var _Heap2 = _interopRequireDefault(_Heap);
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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 three
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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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* * `pushAsync(task, priority, [callback])` - the same as `priorityQueue.push`,
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* except this returns a promise that rejects if an error occurs.
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* * The `unshift` and `unshiftAsync` methods were removed.
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*/
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