presto-main/src/main/java/io/prestosql/execution/resourcegroups/InternalResourceGroupManager.java/InternalResourceGroupManager/start
class InternalResourceGroupManager:    @PostConstruct
    public void start()
    {
        if (started.compareAndSet(false, true)) {
            refreshExecutor.scheduleWithFixedDelay(this::refreshAndStartQueries, 1, 1, TimeUnit.MILLISECONDS);
        }
    }