return messages != null ? messages.size() : 0;
        }
    }

    /**
     * Clears all messages in this session and updates the last accessed timestamp.
     */
    public void clearMessages() {
        synchronized (messagesLock) {
            if (messages != null) {
                messages.clear();
            }
        }
        this.lastAccessedAt = LocalDateTime.now();
    }

    /**

        // Test with null regex
        cmdList.clear();
        execJob.testAddFessCustomSystemProperties(cmdList, null);
        assertEquals(0, cmdList.size());

        // Test with empty regex
        cmdList.clear();
        execJob.testAddFessCustomSystemProperties(cmdList, "");
        assertEquals(0, cmdList.size());

        // Clean up
        System.clearProperty("custom.prop.one");

            if (logger.isDebugEnabled()) {
                logger.debug("Cannot clear session, not found. sessionId={}", sessionId);
            }
            return false;
        }
        // Verify ownership
        final String sessionUserId = session.getUserId();
        if (userId != null && !userId.equals(sessionUserId)) {
            logger.warn("Cannot clear session, userId mismatch. sessionId={}, requestUserId={}", sessionId, userId);

        });
    }

    /**
     * Clears the chat session.
     *
     * @param form the chat form containing the session ID to clear
     * @return the HTML response redirecting to the chat page
     */
    @Execute
    public HtmlResponse clear(final ChatForm form) {
        if (form.sessionId != null) {
            if (logger.isDebugEnabled()) {

    @Override
    protected boolean isUseOneTimeContainer() {
        return true;
    }

    @Test
    public void test_maxUsernameLength() throws IOException {
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public Integer getLdapMaxUsernameLengthAsInteger() {
                return Integer.valueOf(-1);
            }
        };

        }

        @Override
        protected void storeQueue(List<Tuple3<String, String, String>> taskList) {
            // Override to avoid database operations
            taskList.clear();
        }

        @Override
        protected String getImageFilename(final Map<String, Object> docMap) {
            // Override to avoid null pointer issues

    @Test
    public void test_doCrawl_withErrors() {
        // Clear any previous errors
        try {
            Field errorsField = Crawler.class.getDeclaredField("errors");
            errorsField.setAccessible(true);
            Queue<String> errors = (Queue<String>) errorsField.get(null);
            errors.clear();
        } catch (Exception e) {
            // Ignore if field doesn't exist
        }

    }

    /**
     * Creates an unclear intent result when intent cannot be determined.
     *
     * @param reasoning the detection reasoning
     * @return the unclear intent result
     */
    public static IntentDetectionResult unclear(final String reasoning) {
        return new IntentDetectionResult(ChatIntent.UNCLEAR, null, null, reasoning);
    }

    /**

        assertEquals(0, indexingHelper.deleteOldDocuments(client, docList));
        assertEquals(0, docList.size());
        assertEquals(0, deletedDocIdList.size());

        docList.clear();
        deletedDocIdList.clear();
        docList.add(new HashMap<>(Map.of(//
                "config_id", "W01", //
                "doc_id", "1", //
                "url", "http://test.com/001"//
        )));

        assertEquals(ChatIntent.UNCLEAR, ChatIntent.fromValue("unclear"));
        assertEquals(ChatIntent.UNCLEAR, ChatIntent.fromValue("UNCLEAR"));
        assertEquals(ChatIntent.UNCLEAR, ChatIntent.fromValue("Unclear"));
    }

    @Test
    public void test_fromValue_null() {
        // Defaults to UNCLEAR when value is null
        assertEquals(ChatIntent.UNCLEAR, ChatIntent.fromValue(null));
    }

    @Test