docs: public ZuulFilter getFilter(String sCode, String sName) throws Exception {
  
          if (filterCheck.get(sName) == null) {
              filterCheck.putIfAbsent(sName, sName);
              if (!sCode.equals(filterClassCode.get(sName))) {
                  LOG.info("reloading code " + sName);
                  filterRegistry.remove(sName);
              }
          }
          ZuulFilter filter = filterRegistry.get(sName);
          if (filter == null) {
              Class clazz = compiler.compile(sCode, sName);
              if (!Modifier.isAbstract(clazz.getModifiers())) {
                  filter = filterFactory.newInstance(clazz);
              }
          }
          return filter;
  
      }