@Override
        public Iterator<Lifecycle> iterator() {
            return Collections.emptyIterator();
        }

        @Override
        public Optional<Lifecycle> lookup(String id) {
            return Optional.empty();
        }

        @Override
        public List<String> computePhases(Lifecycle lifecycle) {
            return List.of();
        }
    };

func NewSingleton[T any]() *Singleton[T] {
	return &Singleton[T]{set: make(chan struct{}), v: nil}
}

// Get will return the singleton value.
func (s *Singleton[T]) Get() *T {
	<-s.set
	return s.v
}

// GetNonBlocking will return the singleton value or nil if not set yet.
func (s *Singleton[T]) GetNonBlocking() *T {
	select {
	case <-s.set:
		return s.v
	default:
		return nil
	}
}

    return delegate().lastIndexOf(element);
  }

  @Override
  public ListIterator<E> listIterator() {
    return delegate().listIterator();
  }

  @Override
  public ListIterator<E> listIterator(int index) {
    return delegate().listIterator(index);
  }

  @CanIgnoreReturnValue
  @Override
  @ParametricNullness
  public E remove(int index) {
    return delegate().remove(index);
  }

            logger.info("Set requests_per_second to {}", requestsPerSecond);
            return requestsPerSecond;
        }
        return value;
    }

    public boolean createIndex(final String index, final String indexName) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return createIndex(index, indexName, fessConfig.getIndexNumberOfShards(), fessConfig.getIndexAutoExpandReplicas(), true);

            this.id = id;
            myuniqueByProperty("_id");
            return this;
        }

        public String id() {
            return id;
        }

        public DocMeta version(Long version) {
            this.version = version;
            return this;
        }

        public Long version() {
            return version;
        }

        public DocMeta seqNo(Long seqNo) {

    public String getContainingType() {
        return containingType;
    }

    public String getPropertyName() {
        return propertyName;
    }

    public String getMethodName() {
        return methodName;
    }

    public String getMethodDescriptor() {
        return methodDescriptor;
    }

    public List<ReplacedAccessor> getReplacedAccessors() {
        return replacedAccessors;
    }

    @Override

    @Override
    public String getId() {
        return crawlingConfig.getId();
    }

    @Override
    public String getName() {
        return crawlingConfig.getName();
    }

    @Override
    public String[] getPermissions() {
        return crawlingConfig.getPermissions();
    }

    @Override
    public String[] getVirtualHosts() {
        return crawlingConfig.getVirtualHosts();
    }

	if !flags.Write {
		// sanity check
		return nil, os.ErrInvalid
	}

	bucket, object := path2BucketObject(r.Filepath)
	if bucket == "" {
		return nil, errors.New("bucket name cannot be empty")
	}

	clnt, err := f.getMinIOClient()
	if err != nil {
		return nil, err
	}
	ok, err := clnt.BucketExists(r.Context(), bucket)
	if err != nil {
		return nil, err
	}
	if !ok {

	if len(args) != 0 {
		return nil, cobra.ShellCompDirectiveNoFileComp
	}
	client, err := ctx.CLIClient()
	if err != nil {
		return nil, cobra.ShellCompDirectiveNoFileComp
	}
	nsName, err := getNamespacesName(client, toComplete)
	if err != nil {
		return nil, cobra.ShellCompDirectiveNoFileComp
	}
	return nsName, cobra.ShellCompDirectiveNoFileComp
}

    @Override
    public String asTableDbName() {
        return asEsIndexType();
    }

    @Override
    protected String asEsIndex() {
        return "fess_config.failure_url";
    }

    @Override
    public String asEsIndexType() {
        return "failure_url";
    }

    @Override
    public String asEsSearchType() {
        return "failure_url";
    }

    @Override