dynamic-config/config-apollo/src/main/java/org/apache/servicecomb/config/archaius/sources/ApolloConfigurationSourceImpl.java [88:144]:
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  @Override
  public void addUpdateListener(WatchedUpdateListener watchedUpdateListener) {
    listeners.add(watchedUpdateListener);
  }

  @Override
  public void removeUpdateListener(WatchedUpdateListener watchedUpdateListener) {
    listeners.remove(watchedUpdateListener);
  }

  private void updateConfiguration(WatchedUpdateResult result) {
    for (WatchedUpdateListener l : listeners) {
      try {
        l.updateConfiguration(result);
      } catch (Throwable ex) {
        LOGGER.error("Error in invoking WatchedUpdateListener", ex);
      }
    }
  }

  @Override
  public Map<String, Object> getCurrentData() throws Exception {
    return valueCache;
  }

  public List<WatchedUpdateListener> getCurrentListeners() {
    return listeners;
  }

  public class UpdateHandler {
    public void handle(ConfigurationAction action, Map<String, Object> config) {
      if (config == null || config.isEmpty()) {
        return;
      }
      Map<String, Object> configuration = ConfigMapping.getConvertedMap(config);
      if (CREATE.equals(action)) {
        valueCache.putAll(configuration);

        updateConfiguration(createIncremental(ImmutableMap.copyOf(configuration),
            null,
            null));
      } else if (SET.equals(action)) {
        valueCache.putAll(configuration);

        updateConfiguration(createIncremental(null,
            ImmutableMap.copyOf(configuration),
            null));
      } else if (DELETE.equals(action)) {
        configuration.keySet().forEach(valueCache::remove);
        updateConfiguration(createIncremental(null,
            null,
            ImmutableMap.copyOf(configuration)));
      } else {
        LOGGER.error("action: {} is invalid.", action.name());
        return;
      }
      LOGGER.warn("Config value cache changed: action:{}; item:{}", action.name(), configuration.keySet());
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dynamic-config/config-nacos/src/main/java/org/apache/servicecomb/config/nacos/archaius/sources/NacosConfigurationSourceImpl.java [86:142]:
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  @Override
  public void addUpdateListener(WatchedUpdateListener watchedUpdateListener) {
    listeners.add(watchedUpdateListener);
  }

  @Override
  public void removeUpdateListener(WatchedUpdateListener watchedUpdateListener) {
    listeners.remove(watchedUpdateListener);
  }

  private void updateConfiguration(WatchedUpdateResult result) {
    for (WatchedUpdateListener l : listeners) {
      try {
        l.updateConfiguration(result);
      } catch (Throwable ex) {
        LOGGER.error("Error in invoking WatchedUpdateListener", ex);
      }
    }
  }

  @Override
  public Map<String, Object> getCurrentData() throws Exception {
    return valueCache;
  }

  public List<WatchedUpdateListener> getCurrentListeners() {
    return listeners;
  }

  public class UpdateHandler {
    public void handle(ConfigurationAction action, Map<String, Object> config) {
      if (config == null || config.isEmpty()) {
        return;
      }
      Map<String, Object> configuration = ConfigMapping.getConvertedMap(config);
      if (CREATE.equals(action)) {
        valueCache.putAll(configuration);

        updateConfiguration(createIncremental(ImmutableMap.copyOf(configuration),
            null,
            null));
      } else if (SET.equals(action)) {
        valueCache.putAll(configuration);

        updateConfiguration(createIncremental(null,
            ImmutableMap.copyOf(configuration),
            null));
      } else if (DELETE.equals(action)) {
        configuration.keySet().forEach(valueCache::remove);
        updateConfiguration(createIncremental(null,
            null,
            ImmutableMap.copyOf(configuration)));
      } else {
        LOGGER.error("action: {} is invalid.", action.name());
        return;
      }
      LOGGER.warn("Config value cache changed: action:{}; item:{}", action.name(), configuration.keySet());
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