}
  }

  @AfterExperiment
  void tearDown() throws Exception {
    executorService.shutdown();
  }

  @Footprint(exclude = {Runnable.class, Executor.class})
  public Object measureSize() {
    list = impl.newExecutionList();
    for (int i = 0; i < numListeners; i++) {
      list.add(listener, directExecutor());
    }
    return list.getImpl();
  }

  @Benchmark