apollo-client/src/main/java/com/ctrip/framework/apollo/internals/AbstractConfigFile.java/AbstractConfigFile/fireConfigChange
class AbstractConfigFile:  private void fireConfigChange(final ConfigFileChangeEvent changeEvent) {
    for (final ConfigFileChangeListener listener : m_listeners) {
      m_executorService.submit(new Runnable() {
        @Override
        public void run() {
          String listenerName = listener.getClass().getName();
          Transaction transaction = Tracer.newTransaction("Apollo.ConfigFileChangeListener", listenerName);
          try {
            listener.onChange(changeEvent);
            transaction.setStatus(Transaction.SUCCESS);
          } catch (Throwable ex) {
            transaction.setStatus(ex);
            Tracer.logError(ex);
            logger.error("Failed to invoke config file change listener {}", listenerName, ex);
          } finally {
            transaction.complete();
          }
        }
      });
    }
  }