code: public BeanDefinitionHolder decorate(Node source,
                                           BeanDefinitionHolder holder,
                                           ParserContext context) {
  
          boolean enabled = getBooleanAttributeValue(source);
          if (enabled) {
              registerProxyCreator(source, holder, context);
          }
  
          return holder;
      }
docs: Method called by Spring when it encounters the jrugged:perfmon attribute.
  Checks if the attribute is true, and if so, it registers a proxy for the
  bean.