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