* This is for the benefit of container environments that implement code unloading.
 *
 * Most applications should share a process-wide [TaskRunner] and use queues for per-client work.
 */
class TaskRunner(
  val backend: Backend,
  internal val logger: Logger = TaskRunner.logger,
) {
  val lock: ReentrantLock = ReentrantLock()
  val condition: Condition = lock.newCondition()

import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;

/**
 * This class provides a skeletal implementation of the {@code Cache} interface to minimize the
 * effort required to implement this interface.
 *
 * <p>To implement a cache, the programmer needs only to extend this class and provide an
 * implementation for the {@link #put} and {@link #getIfPresent} methods. {@link #getAllPresent} is

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import jakarta.annotation.Resource;

public class OpenSearchUrlQueueService extends AbstractCrawlerService implements UrlQueueService<OpenSearchUrlQueue> {
    private static final Logger logger = LoggerFactory.getLogger(OpenSearchUrlQueueService.class);

    @Resource
    protected OpenSearchDataService dataService;

 */
package org.codelibs.fess.es.config.cbean.cq;

import org.codelibs.fess.es.config.cbean.cq.bs.BsAccessTokenCQ;

/**
 * @author ESFlute (using FreeGen)
 */
public class AccessTokenCQ extends BsAccessTokenCQ {

 */
package org.codelibs.fess.es.config.cbean.cq;

import org.codelibs.fess.es.config.cbean.cq.bs.BsBoostDocumentRuleCQ;

/**
 * @author ESFlute (using FreeGen)
 */
public class BoostDocumentRuleCQ extends BsBoostDocumentRuleCQ {

 */
package org.codelibs.fess.es.config.cbean.cq;

import org.codelibs.fess.es.config.cbean.cq.bs.BsDuplicateHostCQ;

/**
 * @author ESFlute (using FreeGen)
 */
public class DuplicateHostCQ extends BsDuplicateHostCQ {

 */
package org.codelibs.fess.es.config.cbean.cq;

import org.codelibs.fess.es.config.cbean.cq.bs.BsElevateWordCQ;

/**
 * @author ESFlute (using FreeGen)
 */
public class ElevateWordCQ extends BsElevateWordCQ {

 */
package org.codelibs.fess.es.config.cbean.cq;

import org.codelibs.fess.es.config.cbean.cq.bs.BsFailureUrlCQ;

/**
 * @author ESFlute (using FreeGen)
 */
public class FailureUrlCQ extends BsFailureUrlCQ {

 */
package org.codelibs.fess.es.config.cbean.cq;

import org.codelibs.fess.es.config.cbean.cq.bs.BsRelatedContentCQ;

/**
 * @author ESFlute (using FreeGen)
 */
public class RelatedContentCQ extends BsRelatedContentCQ {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.util;

import org.dbflute.optional.OptionalEntity;

public class OptionalUtil {

    public static <T> OptionalEntity<T> ofNullable(final T entity) {
        return OptionalEntity.ofNullable(entity, () -> {});
    }