/** 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(). */

![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

        }
        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();

    ```

### Timeouts ([.kt][ConfigureTimeoutsKotlin], [.java][ConfigureTimeoutsJava])

Use timeouts to fail a call when its peer is unreachable. Network partitions can be due to client connectivity problems, server availability problems, or anything between. OkHttp supports connect, write, read, and full call timeouts.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client: OkHttpClient = OkHttpClient.Builder()

     */
    public boolean isAvailable() {
        final boolean available = llmClientManager.available();
        if (logger.isTraceEnabled()) {
            logger.trace("[RAG] ChatClient availability check. available={}", available);
        }
        return available;
    }

    /**
     * Performs a chat request with RAG.
     *
     * @param sessionId the session ID (can be null for new sessions)

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