code: @Override
      public int compare(final Runnable r1, final Runnable r2) {
          int res = 0;
  
          final JRebirthRunnable jrr1 = (JRebirthRunnable) r1;
          final JRebirthRunnable jrr2 = (JRebirthRunnable) r2;
  
          if (jrr1 == null) {
              res = jrr2 == null ? 0 : 1;
          } else if (jrr2 == null) {
              res = -1;
          } else if (jrr1.priority().level() == jrr2.priority().level()) {
              // Compare creation time
              res = jrr1.creationTime().compareTo(jrr2.creationTime());
          } else {
              res = ((Integer) jrr1.priority().level()).compareTo(jrr2.priority().level()) * -1;
          }
          return res;
      }
docs: {@inheritDoc}