presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/jmx/StatisticsAwareConnectionFactory.java/StatisticsAwareConnectionFactory/StatisticsAwareConnectionFactory
class StatisticsAwareConnectionFactory:    public StatisticsAwareConnectionFactory(ConnectionFactory delegate)
    {
        this.delegate = requireNonNull(delegate, "delegate is null");
    }