code: def get_next_of_type(self, processor_type):
          with self._condition:
              if processor_type not in self:
                  self.wait_for_registration(processor_type)
              try:
                  processor = self[processor_type].next_processor()
              except NoProcessorVacancyError:
                  processor = self.wait_for_vacancy(processor_type)
              processor.inc_occupancy()
              return processor