package eu.sydisnet.blog.samples.deltaspike.cdi12.boundary;
   
   import eu.sydisnet.blog.samples.deltaspike.cdi12.control.MessageFormatter;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import javax.annotation.PostConstruct;
   import javax.annotation.PreDestroy;
   import javax.inject.Inject;
  import java.lang.invoke.MethodHandles;
  
  /**
   * Component whose responsibility is to send to the client a welcome message.
   *
   * @since       CDI 1.2
   * @author      sydisnet
   * @version     1.0.0
   */
  @Unique
  public class SingletonHelloServiceV2 {
  
      /**
       * Static Logger.
       */
      private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
      /**
       * Constant used by the service when userName is not defined by the client.
       */
      private static final String UNKNOWN_USERNAME = "M. John Doe";
  
      /**
       * The default message template assigned when the bean is loaded.
       */
      private String defaultMessage;
  
      /**
       * Delegate service.
       */
      @Inject
      private MessageFormatter messageFormatter;
  
      /**
       * Method called by the CDI container when the bean is retrieved from
       * {@link javax.enterprise.inject.spi.BeanManager}. See the JSR 250 Callback {@link javax.annotation.PostConstruct}
       * annotation.
       */
      @PostConstruct
      void initBean() {
          defaultMessage = "Welcome %s !";
  
          LOG.info(String.format("##### %s stopped !", MethodHandles.lookup().lookupClass().getSimpleName()));
      }
  
      /**
       * Method called by the CDI container before the destruction of the bean from the
       * {@link javax.enterprise.inject.spi.BeanManager}. See the JSR 250 Callback {@link javax.annotation.PreDestroy}
       * annotation.
       */
      @PreDestroy
      void tearDown() {
          LOG.info(String.format("##### %s stopped !", MethodHandles.lookup().lookupClass().getSimpleName()));
      }
  
      /**
       * Service called by <strong>client-tier</strong> in order to send a welcome message.
       *
       * @param userName the name of the user
       * @return the welcome message
       */
      public String sayHello(final String userName) {
          if (userName == null || userName.isEmpty()) {
              return messageFormatter.format(defaultMessage, UNKNOWN_USERNAME);
          }
  
          return messageFormatter.format(defaultMessage, userName);
      }
  }