emcee.js

var MC = require('emcee')

// add a bunch of models
MC.model('login', function (req, cb) {
  // callback is called with (er, data)
  req.session.get('login', cb)
})

MC.model('train', function (url, res, cb) {

})

// later on...

http.createServer(function (req, res) {
  // check if the user is logged in.
  var m = new MC()

  m.load('login', req)
  m.load('bike', req.url, res)

  m.end(function (er, models) {
    // either there is an error, or all models are loaded on the
    // 'models' object.  note that all errors are assumed to be
    // catastrophic, so you only get the first error, and the
    // models object will only contain the models that got loaded
    // before the error occurred.
  })
}).listen(1337)

flow-control.js

var models = {
  login: login,
  train: train
}

function login(req, cb) {
  req.session.get('login', cb)
}

function train(url, res, cb) {
  ...
}


http.createServer(function (req, res) {
  flowControlMap({
    "login": [req]
    "bike": [req.url, res]
  }, iterator, function (er, models) {
    // either there is an error, or all models are loaded on the
    // 'models' object.  note that all errors are assumed to be
    // catastrophic, so you only get the first error, and the
    // models object will only contain the models that got loaded
    // before the error occurred.
  })

  function iterator(value, name, callback) {
    value.push(callback)
    models[name].apply(models[name], value)
  }
}).listen(1337)