@Override
  public void rollback(FlowTrigger chain, Map data) {
    List<VirtualRouterPortForwardingRuleRefVO> refs =
        (List<VirtualRouterPortForwardingRuleRefVO>)
            data.get(VirtualRouterSyncPortForwardingRulesOnStartFlow.class.getName());
    if (refs != null) {
      dbf.removeCollection(refs, VirtualRouterPortForwardingRuleRefVO.class);
    }

    chain.rollback();
  }