/**
   * Attempts to cancel execution of this step. This attempt will fail if the step has already
   * completed, has already been cancelled, or could not be cancelled for some other reason. If
   * successful, and this step has not started when {@code cancel} is called, this step should never
   * run.
   *
   * <p>If successful, causes the objects captured by this step (if already started) and its input

    V value = entry.getValueReference().get();
    if (value == null) {
      return null;
    }

    if (isExpired(entry, now)) {
      return null;
    }
    return value;
  }

  // expiration

  /** Returns true if the entry has expired. */
  boolean isExpired(ReferenceEntry<K, V> entry, long now) {
    checkNotNull(entry);

    public String toString() {
      if (areEqual()) {
        return "equal";
      }

      StringBuilder result = new StringBuilder("not equal");
      if (!onlyOnLeft.isEmpty()) {
        result.append(": only on left=").append(onlyOnLeft);
      }
      if (!onlyOnRight.isEmpty()) {
        result.append(": only on right=").append(onlyOnRight);
      }
      if (!differences.isEmpty()) {

        WebConfigCQ cq = new WebConfigCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            WebConfigCA ca = new WebConfigCA();

        SearchLogCQ cq = new SearchLogCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            SearchLogCA ca = new SearchLogCA();

        if (mustQuery.hasQueries() || shouldQuery.hasQueries() || mustNotQuery.hasQueries() || filterQuery.hasQueries()) {
            BoolQueryBuilder builder = regBoolCQ(mustQuery.getQueryBuilderList(), shouldQuery.getQueryBuilderList(),
                    mustNotQuery.getQueryBuilderList(), filterQuery.getQueryBuilderList());
            if (opLambda != null) {
                opLambda.callback(builder);

        if (mustQuery.hasQueries() || shouldQuery.hasQueries() || mustNotQuery.hasQueries() || filterQuery.hasQueries()) {
            BoolQueryBuilder builder = regBoolCQ(mustQuery.getQueryBuilderList(), shouldQuery.getQueryBuilderList(),
                    mustNotQuery.getQueryBuilderList(), filterQuery.getQueryBuilderList());
            if (opLambda != null) {
                opLambda.callback(builder);

        }
    }

/**
 * Tests to see if the SMB resource exists. If the resource refers
 * only to a server, this method determines if the server exists on the
 * network and is advertising SMB services. If this resource refers to
 * a workgroup, this method determines if the workgroup name is valid on
 * the local SMB network. If this <code>SmbFile</code> refers to the root

        FileConfigCQ cq = new FileConfigCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            FileConfigCA ca = new FileConfigCA();

        if (mustQuery.hasQueries() || shouldQuery.hasQueries() || mustNotQuery.hasQueries() || filterQuery.hasQueries()) {
            BoolQueryBuilder builder = regBoolCQ(mustQuery.getQueryBuilderList(), shouldQuery.getQueryBuilderList(),
                    mustNotQuery.getQueryBuilderList(), filterQuery.getQueryBuilderList());
            if (opLambda != null) {
                opLambda.callback(builder);