dynamic-config/config-apollo/src/main/java/org/apache/servicecomb/config/client/ApolloClient.java [144:176]:
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    private void refreshConfigItems(Map<String, Object> map) {
      compareChangedConfig(originalConfigMap, map);
      originalConfigMap.clear();
      originalConfigMap.putAll(map);
    }

    void compareChangedConfig(Map<String, Object> before, Map<String, Object> after) {
      Map<String, Object> itemsCreated = new HashMap<>();
      Map<String, Object> itemsDeleted = new HashMap<>();
      Map<String, Object> itemsModified = new HashMap<>();
      if (before == null || before.isEmpty()) {
        updateHandler.handle(CREATE, after);
        return;
      }
      if (after == null || after.isEmpty()) {
        updateHandler.handle(DELETE, before);
        return;
      }
      after.forEach((itemKey, itemValue) -> {
        if (!before.containsKey(itemKey)) {
          itemsCreated.put(itemKey, itemValue);
        } else if (!itemValue.equals(before.get(itemKey))) {
          itemsModified.put(itemKey, itemValue);
        }
      });
      for (String itemKey : before.keySet()) {
        if (!after.containsKey(itemKey)) {
          itemsDeleted.put(itemKey, "");
        }
      }
      updateHandler.handle(CREATE, itemsCreated);
      updateHandler.handle(SET, itemsModified);
      updateHandler.handle(DELETE, itemsDeleted);
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dynamic-config/config-nacos/src/main/java/org/apache/servicecomb/config/nacos/client/NacosClient.java [102:134]:
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    private void refreshConfigItems(Map<String, Object> map) {
      compareChangedConfig(originalConfigMap, map);
      originalConfigMap.clear();
      originalConfigMap.putAll(map);
    }

    void compareChangedConfig(Map<String, Object> before, Map<String, Object> after) {
      Map<String, Object> itemsCreated = new HashMap<>();
      Map<String, Object> itemsDeleted = new HashMap<>();
      Map<String, Object> itemsModified = new HashMap<>();
      if (before == null || before.isEmpty()) {
        updateHandler.handle(CREATE, after);
        return;
      }
      if (after == null || after.isEmpty()) {
        updateHandler.handle(DELETE, before);
        return;
      }
      after.forEach((itemKey, itemValue) -> {
        if (!before.containsKey(itemKey)) {
          itemsCreated.put(itemKey, itemValue);
        } else if (!itemValue.equals(before.get(itemKey))) {
          itemsModified.put(itemKey, itemValue);
        }
      });
      for (String itemKey : before.keySet()) {
        if (!after.containsKey(itemKey)) {
          itemsDeleted.put(itemKey, "");
        }
      }
      updateHandler.handle(CREATE, itemsCreated);
      updateHandler.handle(SET, itemsModified);
      updateHandler.handle(DELETE, itemsDeleted);
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