}

    @Override
    public boolean removeAll(Collection<?> elementsToRemove) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeIf(java.util.function.Predicate<? super E> filter) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean retainAll(Collection<?> elementsToRetain) {

    LocalCache<Integer, Integer> map =
        makeLocalCache(createCacheBuilder().concurrencyLevel(1).initialCapacity(1));
    map.put(1, 1);
    map.put(2, 1);
    map.put(3, 1);
    map.entrySet()
        .removeIf(
            entry -> {
              if (entry.getValue().equals(1)) {
                map.put(entry.getKey(), 2);
                return true;
              } else {
                return false;

      synchronized (mutex) {
        return delegate().retainAll(c);
      }
    }

    @Override
    public boolean removeIf(Predicate<? super E> filter) {
      synchronized (mutex) {
        return delegate().removeIf(filter);
      }
    }

    @Override
    public int size() {
      synchronized (mutex) {
        return delegate().size();
      }
    }

    }

    @Override
    public Iterator<V> iterator() {
      return new ValueIterator();
    }

    @Override
    public boolean removeIf(Predicate<? super V> filter) {
      checkNotNull(filter);
      return LocalCache.this.removeIf((k, v) -> filter.test(v));
    }

    @Override
    public boolean contains(Object o) {
      return LocalCache.this.containsValue(o);
    }
  }

   * @return {@code true} if any elements were removed from the iterator
   * @since 2.0
   */
  @CanIgnoreReturnValue
  public static <T extends @Nullable Object> boolean removeIf(
      Iterator<T> removeFrom, Predicate<? super T> predicate) {
    checkNotNull(predicate);
    boolean modified = false;
    while (removeFrom.hasNext()) {
      if (predicate.apply(removeFrom.next())) {