* @param request The HTTP servlet request.
     * @param response The HTTP servlet response.
     * @param chain The filter chain.
     * @throws IOException If an input/output error occurs.
     * @throws ServletException If a servlet error occurs.
     */
    void process(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException;

     * @return a string containing the execution result with the number of deleted files or error message
     */
    public String execute() {
        try {
            final long count = ComponentUtil.getThumbnailManager().purge(getExpiry());
            return "Deleted " + count + " thumbnail files.";
        } catch (final Exception e) {
            logger.error("Failed to purge thumbnails.", e);
            return e.getMessage();
        }

     */
    public boolean isSuccess() {
        return returnCode == ERROR_SUCCESS;
    }

    /**
     * Gets the error message for the current return code.
     *
     * @return a human-readable error message
     */
    public String getErrorMessage() {
        switch (returnCode) {
        case ERROR_SUCCESS:
            return "Success";

     */
    public enum Status {
        /** Successful response status. */
        OK(0),
        /** Bad request status indicating client error. */
        BAD_REQUEST(1),
        /** System error status indicating server error. */
        SYSTEM_ERROR(2),
        /** Unauthorized status indicating authentication failure. */
        UNAUTHORIZED(3),
        /** General failure status. */

 * to create an exception instance with a message and an optional cause.
 *
 * <p>Usage examples:</p>
 * <pre>
 *     throw new CurlException("Error message");
 *     throw new CurlException("Error message", cause);
 * </pre>
 *
 * @see RuntimeException
 */
public class CurlException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    /**

/**
 * Exception thrown when an error occurs in a {@link Converter}.
 *
 * @author higa
 */
public class ConverterRuntimeException extends ClRuntimeException {

    private static final long serialVersionUID = 1L;

    /**
     * The name of the property.
     */
    private final String propertyName;

    /**
     * The value that caused the conversion error.
     */
    private final Object value;

    }

    /**
     * Processes system error log events.
     *
     * @param objs the log objects (should contain a Throwable)
     */
    protected void processSystemError(final Object... objs) {
        final Throwable t = (Throwable) objs[0];
        if (logger.isErrorEnabled()) {
            logger.error("System Error.", t);
        }
    }

    /**

    }

    /**
     * Indexes suggest data from documents.
     *
     * @param success A callback for successful indexing.
     * @param error   A callback for indexing errors.
     */
    public void indexFromDocuments(final Consumer<Boolean> success, final Consumer<Throwable> error) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

                        + (this.resourceLoc != null ? this.resourceLoc.getURL() : "unknown"));
                emergencyReleaseHandle();
            }
        } catch (Exception e) {
            log.error("Error during tree handle finalization", e);
        } finally {
            super.finalize();
        }
    }

    private void emergencyReleaseHandle() {
        try {

    public static void printThreadDumpAsWarn() {
        processThreadDump(logger::warn);
    }

    /**
     * Prints thread dump information to the logger at ERROR level.
     */
    public static void printThreadDumpAsError() {
        processThreadDump(logger::error);
    }

    /**
     * Writes thread dump information to the specified file.
     *
     * @param file the file path to write the thread dump to
     */