gistfile1.coffee

queue = []

providerA = (args...) ->
  console.log args

providerB = (args...) ->
  alert args

doRequest = (args...) ->
  queue.push args

chooseProvider = (callback) ->

  timeout = null

  setProvider = (provider) ->
    clearTimeout timeout
    doRequest = provider
    for args in queue
      doRequest args...

  setDefaultProvider = ->
    setProvider providerA

  timeout = setTimeout(setDefaultProvider, 1000)

  callDiscoveryService
    success: (response) ->
      setProvider f(response)
    error: ->
      setDefaultProvider