final MimeTypeHelper mimeTypeHelper = crawlerContainer.getComponent("mimeTypeHelper");
        if (mimeTypeHelper == null) {
            throw new CrawlerSystemException("MimeTypeHelper is unavailable.");
        }
        return mimeTypeHelper;
    }

    /**
     * Returns the ExtractorFactory instance from the CrawlerContainer.
     * @return The ExtractorFactory instance.
     */

            return;
        }

        final JobHelper jobHelper = ComponentUtil.getJobHelper();
        if (!jobHelper.isAvailable(id)) {
            logger.info("Job is unavailable, unregistering: id={}", id);
            jobHelper.unregister(scheduledJob);
            return;
        }

        final JobLog jobLog = new JobLog(scheduledJob);

         * @throws InsufficientDataException If insufficient data is available
         * @throws InternalException If an internal error occurs
         * @throws InvalidResponseException If the response is invalid
         * @throws NoSuchAlgorithmException If the algorithm is not available
         * @throws XmlParserException If XML parsing fails
         * @throws IOException If an I/O error occurs

            }
            return blob;
        }

        /**
         * Gets the content length of the GCS object.
         *
         * @return The content length in bytes, or -1 if unavailable
         */
        @Override
        public long getContentLengthLong() {
            try {
                if (!connected) {
                    connect();
                }

            }
            return headObject;
        }

        /**
         * Gets the content length of the S3 object.
         *
         * @return The content length in bytes, or -1 if unavailable
         */
        @Override
        public long getContentLengthLong() {
            try {
                if (!connected) {
                    connect();
                }

            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("CrawlerClientCreator is unavailable.", e);
            }
        }
    }

    /**
     * Adds a client with a regular expression pattern.
     * @param regex The regular expression to match URLs.
     * @param client The CrawlerClient instance.
     */

			listenErrCallback(srv.Addrs[i], listenErrs[i])
		} else {
			interfaceFound = true
		}
	}
	if !interfaceFound {
		return nil, errors.New("no available interface found")
	}

	// Wrap given handler to do additional
	// * return 503 (service unavailable) if the server in shutdown.
	wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// If server is in shutdown.

	}

	for _, signer := range hmacSigners {
		if string(alg) == signer.Name {
			return signer, nil
		}
	}

	return nil, jwtgo.NewValidationError(fmt.Sprintf("signing method (%s) is unavailable.", string(alg)),
		jwtgo.ValidationErrorUnverifiable)
}

// ParseWithClaims - parse the token string, valid methods.
func ParseWithClaims(tokenStr string, claims *MapClaims, fn func(*MapClaims) ([]byte, error)) error {

        Class<?> optionalClass = Class.forName("java.util.Optional");
        /*
         * We don't *need* to use reflection to access Optional: It's available on all JDKs we
         * support, and Android code won't get this far, anyway, because ProcessHandle is
         * unavailable. But given how much other reflection we're using, we might as well use it
         * here, too, so that we don't need to also suppress an AndroidApiChecker error.

        // Transient errors
        BUSY("Server busy", ErrorCategory.TRANSIENT, true), TRY_AGAIN("Try again later", ErrorCategory.TRANSIENT,
                true), SERVICE_UNAVAILABLE("Service temporarily unavailable", ErrorCategory.TRANSIENT, true),

        // Generic errors
        UNKNOWN_ERROR("Unknown error", ErrorCategory.UNKNOWN, false), INTERNAL_ERROR("Internal error", ErrorCategory.UNKNOWN, false);