<extension
      point="org.eclipse.elk.core.service.layoutConnectors">
   <setup class="org.eclipse.<yourpath>.PapyrusDiagramtemplateElkLayoutSetup">
   </setup>
</extension>

public class PapyrusDiagramtemplateElkLayoutSetup extends GmfLayoutSetup {
	// Use this class to add new customization options
	/** Guice module for the generic GMF connector. */
	public static class GmfLayoutModule implements Module {
		@Override
		public void configure(final Binder binder) {	
binder.bind(IDiagramLayoutConnector.class).to(PapyrusDiagramtemplateELKLayoutConnector.class);
binder.bind(ILayoutConfigurationStore.Provider.class).to(GmfLayoutConfigurationStore.Provider.class);
		}
	}
}

public class PapyrusDiagramtemplateELKLayoutConnector extends GmfDiagramLayoutConnector {
	// Use this class to add new customization options
}

       /**
       * Helper method used to arrange recursively editparts
       *
       * @param editpart
       *            the editpart to process
       */
       @SuppressWarnings("unchecked")
       public static void arrangeDiagram(EditPart editPart) {
             arrangeDiagramEditParts(editPart);
             arrangeDiagramEditPartsWithELK(editPart);
             arrangeConnectors((IGraphicalEditPart) editPart);
       }

       private static void arrangeDiagramEditParts(EditPart editPart) {
             ArrangeRequest request = new ArrangeRequest(RequestConstants.REQ_ARRANGE_DEFERRED);
             List<EditPart> listToArrange = new ArrayList<>();
             listToArrange.addAll(editPart.getChildren());

             if (!listToArrange.isEmpty()) {
                    for (Object element : editPart.getChildren()) {
                           if (element instanceof EditPart) {
                                  arrangeDiagramEditParts((EditPart) element);
                           }
                    }

                    request.setViewAdaptersToArrange(listToArrange);

                    Command command = editPart.getCommand(request);
                    if (null != command && command.canExecute()) {
                           command.execute();
                    }
             }
       }

       private static void arrangeDiagramEditPartsWithELK(EditPart editPart) {
             LayoutConfigurator layoutConfigurator = new LayoutConfigurator();
             // You might want or need to add new customized parameters to either ElkNodes or ElkEdges following the same template
             layoutConfigurator.configure(ElkNode.class).setProperty(CoreOptions.ALGORITHM, "org.eclipse.elk.layered");
             layoutConfigurator.configure(ElkNode.class).setProperty(CoreOptions.DIRECTION, Direction.DOWN);
             layoutConfigurator.configure(ElkNode.class).setProperty(CoreOptions.SPACING_NODE_NODE, 60.0);
              layoutConfigurator.configure(ElkNode.class).setProperty(CoreOptions.SEPARATE_CONNECTED_COMPONENTS, true);
             DiagramLayoutEngine.Parameters params = new DiagramLayoutEngine.Parameters();

             params.addLayoutRun(layoutConfigurator);
             params.getGlobalSettings()
                           .setProperty(CoreOptions.ANIMATE, false)
                           .setProperty(CoreOptions.PROGRESS_BAR, false)
                           .setProperty(CoreOptions.LAYOUT_ANCESTORS, false)
                           .setProperty(CoreOptions.ZOOM_TO_FIT, false);

             DiagramLayoutEngine.invokeLayout(getWorkbenchPart(), null, params);
       }

       private static IWorkbenchPart getWorkbenchPart() {
             return PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart();
       }

       private static void arrangeConnectors(IGraphicalEditPart modelEditPart) {
             DiagramTemplateSelectAction selectAction = new DiagramTemplateSelectAction(SelectAction.SELECT_ALL_CONNECTORS, Collections.singletonList(modelEditPart));
             List<IGraphicalEditPart> list = selectAction.getAvailableConnectors();
             LineStyleAction lineStyleAction = new LineStyleAction(LineStyleAction.RECTILINEAR, list);
             Command RectilinearCommand = lineStyleAction.getCommand();
             modelEditPart.getEditingDomain().getCommandStack().execute(new GEFtoEMFCommandWrapper(RectilinearCommand));
       }

public class DiagramTemplateSelectAction extends SelectAction {

       public DiagramTemplateSelectAction(String parameter, List<IGraphicalEditPart> selectedElements) {
             super(parameter, selectedElements);
       }

       public List<IGraphicalEditPart> getAvailableConnectors() {
             refreshAllEditParts(getDiagramEditPart());
             System.err.println("getAvailableConnectors_getSelectableNodes: " + getSelectableNodes(getDiagramEditPart()).size());
             System.err.println("getAvailableConnectors_getAllDiagramEditParts: " + DiagramEditPartsUtil.getAllEditParts(getDiagramEditPart()).size());
             List<IGraphicalEditPart> connectorEditParts = getAllConnectors(DiagramEditPartsUtil.getAllEditParts(getDiagramEditPart()));

             return connectorEditParts;
       }

       private void refreshAllEditParts(IGraphicalEditPart gEditPart) {
             Iterator<IGraphicalEditPart> it = gEditPart.getChildren().iterator();
             while (it.hasNext()) {
                    IGraphicalEditPart igep = it.next();
                    igep.refresh();
                    refreshAllEditParts(igep);
             }
       }

       private List<IGraphicalEditPart> getAllConnectors(List<IGraphicalEditPart> allgEditParts) {
             System.err.println("getAllConnectors:" + addSelectableConnections(allgEditParts).size());
             return addSelectableConnections(allgEditParts);
       }
}