code: public synchronized Kms getKms(OpenViduKurentoClientSessionInfo sessionInfo) {
      if (usageIterator == null || !usageIterator.hasNext()) {
        usageIterator = kmss.iterator();
      }
      return usageIterator.next();
    }
docs: Returns a {@link Kms} using a round-robin strategy.
  
  @param sessionInfo
  session's id