apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/message/ReleaseMessageScanner.java/ReleaseMessageScanner/scanMessages
class ReleaseMessageScanner:  private void scanMessages() {
    boolean hasMoreMessages = true;
    while (hasMoreMessages && !Thread.currentThread().isInterrupted()) {
      hasMoreMessages = scanAndSendMessages();
    }
  }