Dbqb_Study/吴光慧学习笔记/11.1/study/node_modules/async/priorityQueue.js

'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);

    var {
        push,
        pushAsync
    } = q;

    q._tasks = new _Heap2.default();
    q._createTaskItem = ({ data, priority }, callback) => {
        return {
            data,
            priority,
            callback
        };
    };

    function createDataItems(tasks, priority) {
        if (!Array.isArray(tasks)) {
            return { data: tasks, priority };
        }
        return tasks.map(data => {
            return { data, priority };
        });
    }

    // Override push to accept second parameter representing priority
    q.push = function (data, priority = 0, callback) {
        return push(createDataItems(data, priority), callback);
    };

    q.pushAsync = function (data, priority = 0, callback) {
        return pushAsync(createDataItems(data, priority), callback);
    };

    // Remove unshift functions
    delete q.unshift;
    delete q.unshiftAsync;

    return q;
};

var _queue = require('./queue.js');

var _queue2 = _interopRequireDefault(_queue);

var _Heap = require('./internal/Heap.js');

var _Heap2 = _interopRequireDefault(_Heap);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

module.exports = exports.default;