code: private String simpleServiceNames(Collection<Service> services) {
          StringBuilder buffer = new StringBuilder();
          for (Service service : services) {
              if (buffer.length() > 0) {
                  buffer.append(",");
              }
              buffer.append(service.getClass().getSimpleName());
          }
          return buffer.toString();
      }
docs: Get simple service names as a comma-separated list.