RegisterFlushOrder(
     FlushOrder flushOrder,
     Type classType
     )
 {
     _flushOrderItems.Add(classType, new FlushItem(flushOrder, classType));
 }
 FlushItem(
     FlushOrder flushOrder,
     Type classType
     )
 {
     _flushOrder = flushOrder;
     _classType  = classType;
 }