apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/message/ReleaseMessageScanner.java/ReleaseMessageScanner/fireMessageScanned
class ReleaseMessageScanner:  private void fireMessageScanned(Iterable<ReleaseMessage> messages) {
    for (ReleaseMessage message : messages) {
      for (ReleaseMessageListener listener : listeners) {
        try {
          listener.handleMessage(message, Topics.APOLLO_RELEASE_TOPIC);
        } catch (Throwable ex) {
          Tracer.logError(ex);
          logger.error("Failed to invoke message listener {}", listener.getClass(), ex);
        }
      }
    }
  }