@Override
    public void handlerRule(final RuleData ruleData) {
        Optional.ofNullable(ruleData.getHandle()).ifPresent(s -> {
            ParamMappingRuleHandle paramMappingRuleHandle = GsonUtils.getInstance().fromJson(s, ParamMappingRuleHandle.class);
            CACHED_HANDLE.get().cachedHandle(CacheKeyUtils.INST.getKey(ruleData), paramMappingRuleHandle);
        });
    }
The type param mapping path plugin data subscriber.
shenyu-plugin/shenyu-plugin-param-mapping/src/main/java/org/apache/shenyu/plugin/param/mapping/handler/ParamMappingPluginDataHandler.java