presto-blackhole/src/main/java/io/prestosql/plugin/blackhole/BlackHolePageSourceProvider.java/BlackHolePageSourceProvider/BlackHolePageSourceProvider
class BlackHolePageSourceProvider:    public BlackHolePageSourceProvider(ListeningScheduledExecutorService executorService)
    {
        this.executorService = requireNonNull(executorService, "executorService is null");
    }