code: public static Set<String> listLinks(OperationContext context, PathAddress overlayAddress) {
          Resource overlayResource = context.readResourceFromRoot(overlayAddress);
          if (overlayResource.hasChildren(DEPLOYMENT)) {
              return overlayResource.getChildrenNames(DEPLOYMENT);
          }
          return Collections.emptySet();
      }
docs: Returns all the deployment runtime names associated with an overlay.
  
  @param context the current OperationContext.
  @param overlayAddress the address for the averlay.
  @return all the deployment runtime names associated with an overlay.