@Override
        public void run() {
          list.execute();
        }
      };

  @Benchmark
  int addThenExecute_multiThreaded(int reps) throws InterruptedException {
    Runnable addTask =
        new Runnable() {
          @Override
          public void run() {
            for (int i = 0; i < numListeners; i++) {
              list.add(listener, directExecutor());
            }
          }