def _add_job_control_plane(self):
if not self._has_jcp:<EOL><INDENT>jcp = self.graph.addOperator(kind="<STR_LIT>", name="<STR_LIT>")<EOL>jcp.viewable = False<EOL>self._has_jcp = True<EOL><DEDENT>
Add a JobControlPlane operator to the topology, if one has not already
been added.  If a JobControlPlane operator has already been added,
this has no effect.