unique id issue

gistfile1.coffee

class System
  createResponseSocket: ->
    @responseSocket = zmq.createSocket 'rep'
    @responseSocket.bind 'ipc:///tmp/system-master', (err) =>
      if err
        throw err
      @responseSocket.on 'message', (data) =>
        @handleMessage data, (response) =>
          @responseSocket.send(response)
    
  handleMessage: (msg, callback) ->
    msg = msg.toString('utf8')
    recipient = parseInt(msg.slice(0,3))
    if recipient == 999
      data = BISON.decode(msg.slice(3))
      switch data.type
        # Snip
        when 'NEW-ID'
          @getNewID (id) ->
            callback id.toString()
    # Snip
      
  getNewID: (callback) ->
    console.log @idCounter
    callback ++@idCounter