code: def issueServiceJob(self, jobNode):
          
          if jobNode.preemptable:
              self.preemptableServiceJobsToBeIssued.append(jobNode)
          else:
              self.serviceJobsToBeIssued.append(jobNode)
          self.issueQueingServiceJobs()
docs: Issue a service job, putting it on a queue if the maximum number of service
          jobs to be scheduled has been reached.