You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
unboundedpress/node_modules/async/priorityQueue.js

84 lines
2.6 KiB
JavaScript

'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = function (worker, concurrency) {
// Start with a normal queue
var q = (0, _queue2.default)(worker, concurrency);
q._tasks = new _Heap2.default();
// Override push to accept second parameter representing priority
q.push = function (data, priority = 0, callback = () => {}) {
if (typeof callback !== 'function') {
throw new Error('task callback must be a function');
}
q.started = true;
if (!Array.isArray(data)) {
data = [data];
}
if (data.length === 0 && q.idle()) {
// call drain immediately if there are no tasks
return (0, _setImmediate2.default)(() => q.drain());
}
for (var i = 0, l = data.length; i < l; i++) {
var item = {
data: data[i],
priority,
callback
};
q._tasks.push(item);
}
(0, _setImmediate2.default)(q.process);
};
// Remove unshift function
delete q.unshift;
return q;
};
var _setImmediate = require('./setImmediate');
var _setImmediate2 = _interopRequireDefault(_setImmediate);
var _queue = require('./queue');
var _queue2 = _interopRequireDefault(_queue);
var _Heap = require('./internal/Heap');
var _Heap2 = _interopRequireDefault(_Heap);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
module.exports = exports['default'];
/**
* The same as [async.queue]{@link module:ControlFlow.queue} only tasks are assigned a priority and
* completed in ascending priority order.
*
* @name priorityQueue
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.queue]{@link module:ControlFlow.queue}
* @category Control Flow
* @param {AsyncFunction} worker - An async function for processing a queued task.
* If you want to handle errors from an individual task, pass a callback to
* `q.push()`.
* Invoked with (task, callback).
* @param {number} concurrency - An `integer` for determining how many `worker`
* functions should be run in parallel. If omitted, the concurrency defaults to
* `1`. If the concurrency is `0`, an error is thrown.
* @returns {module:ControlFlow.QueueObject} A priorityQueue object to manage the tasks. There are two
* differences between `queue` and `priorityQueue` objects:
* * `push(task, priority, [callback])` - `priority` should be a number. If an
* array of `tasks` is given, all tasks will be assigned the same priority.
* * The `unshift` method was removed.
*/