/** The HTTP client used for API communication. */
    protected CloseableHttpClient httpClient;

    /** Cached availability status of the LLM provider. */
    protected volatile Boolean cachedAvailability = null;

    /** The scheduled task for periodic availability checks. */
    protected TimeoutTask availabilityCheckTask;

    /** Semaphore for limiting concurrent LLM requests. Initialized lazily in init(). */

        emptyGenerator = new EmptyGenerator();

        // Test that isAvailable returns true for EmptyGenerator
        assertTrue(emptyGenerator.isAvailable());
        // Test cached availability
        assertTrue(emptyGenerator.isAvailable());
    }

    @Test
    public void test_isTarget() {
        // Initialize without container
        emptyGenerator = new EmptyGenerator();

     */
    @Execute
    public HtmlResponse index() {
        if (logger.isDebugEnabled()) {
            logger.debug("Chat page requested. Checking availability...");
        }

        if (!chatClient.isAvailable()) {
            if (logger.isInfoEnabled()) {
                logger.info("Redirecting to search page. RAG chat is not available.");
            }

![Events Diagram](../assets/images/******@****.***)

### Availability

        customHook.hook(assistantDirector);

        // Verify that exception was handled
        assertTrue(exceptionHandled.get());
    }

    // Test with a custom ClassLoader to simulate class availability
    @Test
    public void test_hook_withCustomClassLoader() throws Exception {
        // Create a custom ClassLoader that can control class loading behavior

        docMap.put("mimetype", null);
        assertFalse(thumbnailGenerator.isTarget(docMap));
    }

    @Test
    public void test_isAvailable() {
        // Test availability check
        assertTrue(thumbnailGenerator.isAvailable());
    }

    @Test
    public void test_destroy() {
        // Test destroy method - should not throw exception
        thumbnailGenerator.destroy();

    /** The name of this thumbnail generator. */
    protected String name;

    /** Maximum number of redirects to follow. */
    protected int maxRedirectCount = 10;

    /** Availability status of this generator. */
    protected Boolean available = null;

    /**
     * Registers this thumbnail generator with the thumbnail manager.
     */
    public void register() {

      )

    // This is nearly equal to the cipher suites supported in Chrome 72, current as of 2019-02-24.
    // See https://tinyurl.com/okhttp-cipher-suites for availability.
    private val APPROVED_CIPHER_SUITES =
      listOf(
        // TLSv1.3.
        CipherSuite.TLS_AES_128_GCM_SHA256,
        CipherSuite.TLS_AES_256_GCM_SHA384,

        }
        final LlmClient client = getClient();
        final boolean isAvailable = client != null && client.isAvailable();
        if (logger.isTraceEnabled()) {
            logger.trace("[LLM] LLM availability check. llmType={}, clientFound={}, isAvailable={}", llmType, client != null, isAvailable);
        }
        return isAvailable;
    }

    /**
     * Gets the LLM client instance for the configured LLM type.

    public void test_run_componentNotAvailable() throws Exception {
        final List<String> sessionIdList = Arrays.asList("session1");
        indexUpdater.setSessionIdList(sessionIdList);

        // Set component availability to false after some time
        new Thread(() -> {
            ThreadUtil.sleep(50);
            ((TestSystemHelper) systemHelper).setComponentAvailable(false);
        }).start();

        indexUpdater.start();