viki/node_modules/when/lib/decorators/timed.js

/** @license MIT License (c) copyright 2010-2014 original author or authors */
/** @author Brian Cavalier */
/** @author John Hann */

(function(define) { 'use strict';
define(function(require) {

	var env = require('../env');
	var TimeoutError = require('../TimeoutError');

	function setTimeout(f, ms, x, y) {
		return env.setTimer(function() {
			f(x, y, ms);
		}, ms);
	}

	return function timed(Promise) {
		/**
		 * Return a new promise whose fulfillment value is revealed only
		 * after ms milliseconds
		 * @param {number} ms milliseconds
		 * @returns {Promise}
		 */
		Promise.prototype.delay = function(ms) {
			var p = this._beget();
			this._handler.fold(handleDelay, ms, void 0, p._handler);
			return p;
		};

		function handleDelay(ms, x, h) {
			setTimeout(resolveDelay, ms, x, h);
		}

		function resolveDelay(x, h) {
			h.resolve(x);
		}

		/**
		 * Return a new promise that rejects after ms milliseconds unless
		 * this promise fulfills earlier, in which case the returned promise
		 * fulfills with the same value.
		 * @param {number} ms milliseconds
		 * @param {Error|*=} reason optional rejection reason to use, defaults
		 *   to a TimeoutError if not provided
		 * @returns {Promise}
		 */
		Promise.prototype.timeout = function(ms, reason) {
			var p = this._beget();
			var h = p._handler;

			var t = setTimeout(onTimeout, ms, reason, p._handler);

			this._handler.visit(h,
				function onFulfill(x) {
					env.clearTimer(t);
					this.resolve(x); // this = h
				},
				function onReject(x) {
					env.clearTimer(t);
					this.reject(x); // this = h
				},
				h.notify);

			return p;
		};

		function onTimeout(reason, h, ms) {
			var e = typeof reason === 'undefined'
				? new TimeoutError('timed out after ' + ms + 'ms')
				: reason;
			h.reject(e);
		}

		return Promise;
	};

});
}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(require); }));