new TypeVisitor() {
      @Override
      void visitTypeVariable(TypeVariable<?> t) {
        result.set(subtypeOfComponentType(t.getBounds()));
      }

      @Override
      void visitWildcardType(WildcardType t) {
        result.set(subtypeOfComponentType(t.getUpperBounds()));
      }

      @Override
      void visitGenericArrayType(GenericArrayType t) {

    return backingMap.put(key, value);
  }

  @CanIgnoreReturnValue
  final @Nullable V remove(Object key) {
    checkNotNull(key);
    clearCache();
    return backingMap.remove(key);
  }

  final void clear() {
    clearCache();
    backingMap.clear();
  }

  @Nullable V get(Object key) {
    checkNotNull(key);
    V value = getIfCached(key);

    }

    /**
     * Add an interface to the registry
     *
     * @param name the interface name
     * @param syntax the interface syntax (UUID:version)
     */
    public static void addInterface(final String name, final String syntax) {
        INTERFACES.put(name, syntax);
    }

    private final String proto;
    private Map<String, Object> options = null;
    private final String server;

  }

  @Override
  public void addInEdge(E edge, N node, boolean isSelfLoop) {
    checkNotNull(edge);
    checkNotNull(node);

    if (isSelfLoop) {
      checkPositive(++selfLoopCount);
    }
    N previousNode = inEdgeMap.put(edge, node);
    checkState(previousNode == null);
  }

  @Override
  public void addOutEdge(E edge, N node) {
    checkNotNull(edge);

    /**
     * @deprecated we want to use the artifact method only, and ensure artifact.file is set
     *             correctly.
     */
    @Deprecated
    @Override
    public void deploy(
            String basedir,
            String finalName,
            Artifact artifact,
            ArtifactRepository deploymentRepository,
            ArtifactRepository localRepository)

   * <p>When selecting an executor, note that {@code directExecutor} is dangerous in some cases. See
   * the discussion in the {@link ListenableFuture#addListener ListenableFuture.addListener}
   * documentation.
   */
  public void add(Runnable runnable, Executor executor) {
    // Fail fast on a null. We throw NPE here because the contract of Executor states that it throws
    // NPE on null listener, so we propagate that contract up into the add method as well.

        File touchFile = getTouchfile(artifact);
        return getError(touchFile, getRepositoryKey(repository));
    }

    @Override
    public void touch(Artifact artifact, ArtifactRepository repository, String error) {
        File file = artifact.getFile();

        File touchfile = getTouchfile(artifact);

        if (file.exists()) {

    /**
     * Sets up HTML data for rendering, including help link.
     *
     * @param runtime the action runtime
     */
    @Override
    protected void setupHtmlData(final ActionRuntime runtime) {
        super.setupHtmlData(runtime);
        runtime.registerData("helpLink", systemHelper.getHelpLink(fessConfig.getOnlineHelpNameGroup()));
    }

    /**

     * If the analyzer settings index does not exist, it creates it with default settings and mappings.
     * It also loads analyzer names and field analyzer mappings.
     */
    public synchronized void init() {
        try {
            final IndicesExistsResponse response =
                    client.admin().indices().prepareExists(analyzerSettingsIndexName).execute().actionGet(settings.getIndicesTimeout());

    //                                                                               Hook
    //                                                                              ======
    @Override
    protected void setupHtmlData(final ActionRuntime runtime) {
        super.setupHtmlData(runtime);
        runtime.registerData("helpLink", systemHelper.getHelpLink(fessConfig.getOnlineHelpNameDuplicatehost()));
    }

    @Override