slievrly commented on code in PR #6420:
URL: https://github.com/apache/incubator-seata/pull/6420#discussion_r1527501066


##########
config/seata-config-core/src/main/java/org/apache/seata/config/CachedConfigurationChangeListener.java:
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@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.seata.config;
+
+public interface CachedConfigurationChangeListener extends 
ConfigurationChangeListener {
+
+    ConfigurationCache CONFIGURATION_CACHE = ConfigurationCache.getInstance();
+
+    @Override
+    default void afterEvent(ConfigurationChangeEvent event) {
+        ConfigurationChangeListener listener = 
(ConfigurationChangeListener)CONFIGURATION_CACHE;
+        listener.onProcessEvent(event);

Review Comment:
   Design should not be function-oriented but object-oriented; consider design 
from the perspective of interactive behavior, not at the level of assembling 
functions. If ConfigurationCache's before and after are defined to be triggered 
identically, a logical call stack would be: 
NacosConfiguration.addConfigListener -> event -> listener.beforeEvent -> 
listener.onChangeEvent -> listener.afterEvent (ConfigurationCache.beforeEvent 
-> ConfigurationCache.onChangeEvent -> ConfigurationCache.afterEvent)



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