}

    void execute() {
      try {
        executor.execute(command);
      } catch (RuntimeException e) {
        log.log(
            Level.SEVERE,
            "RuntimeException while executing runnable " + command + " with executor " + executor,
            e);
      }
    }
  }

  private final class SetFuture implements Runnable {
    final ListenableFuture<? extends V> delegate;