text: ###############################################################################
  #
  # The MIT License (MIT)
  #
  # Copyright (c) Tavendo GmbH
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  #
  ###############################################################################
  
  import time
  from os import environ
  
  from twisted.internet import reactor
  from twisted.internet.defer import DeferredList
  
  from autobahn.twisted.wamp import ApplicationSession, ApplicationRunner
  
  
  class Component(ApplicationSession):
      """
      An application component using the time service.
      """
  
      def onJoin(self, details):
          print("session attached")
  
          def got(res, started, msg):
              duration = 1000. * (time.clock() - started)
              print("{}: {} in {}".format(msg, res, duration))
  
          t1 = time.clock()
          d1 = self.call(u'com.math.slowsquare', 3)
          d1.addCallback(got, t1, "Slow Square")
  
          t2 = time.clock()
          d2 = self.call(u'com.math.square', 3)
          d2.addCallback(got, t2, "Quick Square")
  
          def done(_):
              print("All finished.")
              self.leave()
  
          DeferredList([d1, d2]).addBoth(done)
  
      def onDisconnect(self):
          print("disconnected")
          reactor.stop()
  
  
  if __name__ == '__main__':
      runner = ApplicationRunner(
          environ.get("AUTOBAHN_DEMO_ROUTER", u"ws://127.0.0.1:8080/ws"),
          u"crossbardemo",
  
          debug=False,  # optional; log even more details
      )
      runner.run(Component)
  