Mixing callbacks with events

server.js

var util = require("util");
var events = require("events");

var AsyncServer = function(){
  this.request_count = 0;
};
util.inherits(AsyncServer, events.EventEmitter);

AsyncServer.make = function(){
  var server = new AsyncServer();

  return server;
};

AsyncServer.create = function(){
  var server = AsyncServer.make({});
  return server;
};

AsyncServer.prototype.request = function(value, cb){
  var self = this;
  if (this.request_count == 0) {
    this.request_count++;
    process.nextTick(function(){
      setTimeout(function(){
        cb(value);
      },1000);
    });
  } else {
    process.nextTick(function(){
      cb(value);
    });
  }
};

var my_server = AsyncServer.create();
my_server.request("foo", function(value){
  console.log("foo is", value);
});

my_server.request("bar", function(value){
  console.log("bar is", value);
});