/// info

You can read more about the Starlette `lifespan` handlers in <a href="https://www.starlette.dev/lifespan/" class="external-link" target="_blank">Starlette's  Lifespan' docs</a>.

Including how to handle lifespan state that can be used in other areas of your code.

///

## Sub Applications { #sub-applications }

import org.codelibs.fess.util.ComponentUtil;

/**
 * Helper class for crawler logging operations.
 * Extends LogHelperImpl to provide specialized logging functionality for crawler operations,
 * including failure URL tracking and crawler statistics integration.
 */
public class CrawlerLogHelper extends LogHelperImpl {

    /**
     * Creates a new instance of CrawlerLogHelper.
     */
    public CrawlerLogHelper() {

It's still possible to use `BackgroundTask` alone in FastAPI, but you have to create the object in your code and return a Starlette `Response` including it.

You can see more details in <a href="https://www.starlette.dev/background/" class="external-link" target="_blank">Starlette's official docs for Background Tasks</a>.

## Caveat { #caveat }

  }

  /*
   * TODO: b/381289911 - Make the Iterator overload use StringJoiner (including Android or not)—or
   * some other optimization, given that StringJoiner can over-allocate:
   * https://bugs.openjdk.org/browse/JDK-8305774
   */

  // TODO: b/381289911 - Optimize MapJoiner similarly to Joiner (including Android or not).

  /**

   * b)}.
   *
   * <p>The returned object is serializable if both this {@code Equivalence} and {@code reference}
   * are serializable (including when {@code reference} is null).
   *
   * @since 10.0
   */
  public final <S extends @Nullable T> Wrapper<S> wrap(@ParametricNullness S reference) {
    return new Wrapper<>(this, reference);
  }

  /**

Use multiple Pydantic models and inherit freely for each case.

  private void setLink(int i, long value) {
    requireLinks()[i] = value;
  }

  /*
   * We don't define getPredecessor+getSuccessor and setPredecessor+setSuccessor here because
   * they're defined above -- including logic to add and subtract 1 to map between the values stored
   * in the predecessor/successor arrays and the indexes in the elements array that they identify.
   */

 * Python scripts with proper environment setup and argument passing.
 *
 * <p>Python scripts are executed in the WEB-INF/env/python/resources directory
 * and have access to the Fess system environment including OpenSearch URL and session ID.</p>
 */
public class PythonJob extends ExecJob {
    /** Logger instance for this class */
    static final Logger logger = LogManager.getLogger(PythonJob.class);

    /**

 * It extends {@link AbstractCrawlerClient} and provides methods to retrieve content and metadata
 * from FTP servers. The client supports various configurations, including authentication, timeouts,
 * passive/active modes, and encoding settings. It also handles FTP file attributes such as user,
 * group, and symbolic links.
 *
 * <p>

    //                                                                               Hook
    //                                                                              ======
    /**
     * Sets up HTML data for rendering, including help link.
     *
     * @param runtime the action runtime
     */
    @Override
    protected void setupHtmlData(final ActionRuntime runtime) {
        super.setupHtmlData(runtime);