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Viewing file:     priorityQueue.js (2.65 KB)      -rwxrwxrwx

'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'];

/**
 * 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 three
 * 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.
 * * `pushAsync(task, priority, [callback])` - the same as `priorityQueue.push`,
 *   except this returns a promise that rejects if an error occurs.
 * * The `unshift` and `unshiftAsync` methods were removed.
 */