* {@inheritDoc}
     *
     * @see jcifs.util.transport.Response#getExpiration()
     */
    @Override
    public Long getExpiration() {
        return this.expiration;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.util.transport.Response#setExpiration(java.lang.Long)
     */
    @Override
    public void setExpiration(final Long exp) {
        this.expiration = exp;
    }

            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()) {

            if (firstKey == 0) {
                firstKey = k;
            }

            if (timeout > 0) {
                curResp.setExpiration(System.currentTimeMillis() + timeout);
            } else {
                curResp.setExpiration(null);
            }

            curResp.setMid(k);
            this.response_map.put(k, curResp);

            final Request next = curReq.getNext();

                    }
                    break;
                }
                link = link.substring(0, nextSep);
            }
        }

        if (dr != null && now > dr.getExpiration()) {
            if (log.isTraceEnabled()) {
                log.trace("Expiring links " + link);
            }
            links.map.remove(link);
            dr = null;
        }

     * @return this session's UID
     */
    public int getUid() {
        return this.uid;
    }

    /**
     * @return this session's expiration time
     */
    public Long getExpiration() {
        return this.expiration > 0 ? this.expiration : null;
    }

    /**
     * @return this session's credentials
     */
    public CredentialsInternal getCredentials() {