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node_modules/sockjs-client/lib/transport/eventsource.js 766 Bytes
aaac7fed   liuqimichale   add
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  'use strict';
  
  var inherits = require('inherits')
    , AjaxBasedTransport = require('./lib/ajax-based')
    , EventSourceReceiver = require('./receiver/eventsource')
    , XHRCorsObject = require('./sender/xhr-cors')
    , EventSourceDriver = require('eventsource')
    ;
  
  function EventSourceTransport(transUrl) {
    if (!EventSourceTransport.enabled()) {
      throw new Error('Transport created when disabled');
    }
  
    AjaxBasedTransport.call(this, transUrl, '/eventsource', EventSourceReceiver, XHRCorsObject);
  }
  
  inherits(EventSourceTransport, AjaxBasedTransport);
  
  EventSourceTransport.enabled = function() {
    return !!EventSourceDriver;
  };
  
  EventSourceTransport.transportName = 'eventsource';
  EventSourceTransport.roundTrips = 2;
  
  module.exports = EventSourceTransport;