} catch (final Exception e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to select a job by {}", id, e);
                }
                lastException = e;
                ThreadUtil.sleep(RandomUtils.nextLong(500, 5000));
            }
        }
        logger.warn("Failed to select a job by {}", id, lastException);
        return OptionalEntity.empty();

 */
package org.codelibs.core.lang;

import org.codelibs.core.exception.InterruptedRuntimeException;
import org.codelibs.core.log.Logger;

/**
 * Utility class for Thread class
 *
 * @author shinsuke
 *
 */
public abstract class ThreadUtil {

    private static final Logger logger = Logger.getLogger(ThreadUtil.class);

    /**
     * Do not instantiate.
     */
    protected ThreadUtil() {
    }

    /**

    /** Cache for storing user information. */
    protected LoadingCache<String, UserInfo> userInfoCache;

    /** Name of the logger for search logs. */
    protected String loggerName = "fess.log.searchlog";

    /** Logger for search logs. */
    protected Logger searchLogLogger = null;

    /** ObjectMapper for JSON processing. */
    protected ObjectMapper objectMapper = new ObjectMapper();

    /**

			exit(stopProcess())
		case osSignal := <-globalOSSignalCh:
			logger.Info("Exiting on signal: %s", strings.ToUpper(osSignal.String()))
			daemon.SdNotify(false, daemon.SdNotifyStopping)
			exit(stopProcess())
		case signal := <-globalServiceSignalCh:
			switch signal {
			case serviceRestart:
				logger.Info("Restarting on service signal")
				daemon.SdNotify(false, daemon.SdNotifyReloading)

 * including automatic generation of file type facets and custom query mappings.
 */
public class FacetQueryView {
    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(FacetQueryView.class);

    /** Title for this facet query view */
    protected String title;

    /** Map of display keys to their corresponding query strings */

            return stacktraceString.get();
        }

        final String errorCode = UUID.randomUUID().toString();
        if (logger.isDebugEnabled()) {
            logger.debug("[{}] {}", errorCode, stacktraceString.get().replace("\n", "\\n"));
        } else {
            logger.warn("[{}] {}", errorCode, cause.getMessage());
        }
        return "error_code:" + errorCode;
    }

            context.logger.error("Goal canceled by user.");
            return CANCELED;
        } catch (Exception e) {
            if (context.options().showErrors().orElse(false)) {
                context.logger.error(e.getMessage(), e);
            } else {
                context.logger.error(e.getMessage());
            }
            return ERROR;
        }

            context.logger.error("Goal canceled by user.");
            return CANCELED;
        } catch (Exception e) {
            if (context.options().showErrors().orElse(false)) {
                context.logger.error(e.getMessage(), e);
            } else {
                context.logger.error(e.getMessage());
            }
            return ERROR;
        }
    }

 * This job executes the ThumbnailGenerator process as a separate JVM process
 * to create thumbnail images for supported document types.
 */
public class GenerateThumbnailJob extends ExecJob {
    /** Logger for this class. */
    static final Logger logger = LogManager.getLogger(GenerateThumbnailJob.class);

    /** Number of threads to use for thumbnail generation. */
    protected int numOfThreads = 1;

 * limitations under the License.
 */
package gradlebuild.docs.dsl.docbook;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedList;

public class DefaultGenerationListener implements GenerationListener {
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultGenerationListener.class);
    private final LinkedList<String> contextStack = new LinkedList<String>();