| 'use strict'; |
| |
| var inherits = require('inherits') |
| , AjaxBasedTransport = require('./lib/ajax-based') |
| , XhrReceiver = require('./receiver/xhr') |
| , XHRCorsObject = require('./sender/xhr-cors') |
| , XHRLocalObject = require('./sender/xhr-local') |
| ; |
| |
| function XhrPollingTransport(transUrl) { |
| if (!XHRLocalObject.enabled && !XHRCorsObject.enabled) { |
| throw new Error('Transport created when disabled'); |
| } |
| AjaxBasedTransport.call(this, transUrl, '/xhr', XhrReceiver, XHRCorsObject); |
| } |
| |
| inherits(XhrPollingTransport, AjaxBasedTransport); |
| |
| XhrPollingTransport.enabled = function(info) { |
| if (info.nullOrigin) { |
| return false; |
| } |
| |
| if (XHRLocalObject.enabled && info.sameOrigin) { |
| return true; |
| } |
| return XHRCorsObject.enabled; |
| }; |
| |
| XhrPollingTransport.transportName = 'xhr-polling'; |
| XhrPollingTransport.roundTrips = 2; // preflight, ajax |
| |
| module.exports = XhrPollingTransport; |