Current File : //lib/node_modules/pm2/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'];
/**
* 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.
*/
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