if (states != null) {
            final long now = ComponentUtil.getSystemHelper().getCurrentTimeAsLong();
            states.entrySet().stream().filter(e -> (now - e.getValue().getExpiration()) / 1000L > getStateTtl()).map(Map.Entry::getKey)
                    .collect(Collectors.toList()).forEach(s -> {
                        if (logger.isDebugEnabled()) {
                            logger.debug("remove old state: {}", s);