public Iterator<PageImpl> iterator() {
      Iterator<PageImpl> it = pagesToProbablyReclaimQueue.iterator();
      return new Iterator<PageImpl>() {
        @Override
        public boolean hasNext() {
          return it.hasNext();
        }

        @Override
        public PageImpl next() {
          return it.next();
        }

        @Override
        public void remove() {
          it.remove();
          pagesInQueue.decrementAndGet();
        }
      };
    }
public Iterator<PageImpl> iterator()