code: private static FactorFilter<Executor, ExecutableFlow> getStaticRemainingFlowSizeFilter() {
      return FactorFilter
          .create(STATICREMAININGFLOWSIZE_FILTER_NAME, (filteringTarget, referencingObject) -> {
            if (null == filteringTarget) {
              logger.debug(String.format("%s : filtering out the target as it is null.",
                  STATICREMAININGFLOWSIZE_FILTER_NAME));
              return false;
            }
  
            final ExecutorInfo stats = filteringTarget.getExecutorInfo();
            if (null == stats) {
              logger.debug(String.format("%s : filtering out %s as it's stats is unavailable.",
                  STATICREMAININGFLOWSIZE_FILTER_NAME,
                  filteringTarget.toString()));
              return false;
            }
            return stats.getRemainingFlowCapacity() > 0;
          });
    }
docs: <pre>
  function to register the static remaining flow size filter.
  NOTE : this is a static filter which means the filter will be filtering based on the system
  standard which is not
  Coming for the passed flow.
  Ideally this filter will make sure only the executor hasn't reached the Max allowed #
  of
  executing flows.
  </pre>