public List<Integer> getTopicBrokerIdList() {
        List<Integer> tmpBrokerIdList = new ArrayList<>();
        if (data != null) {
            for (TopicInfoList topicInfoList : data) {
                if (topicInfoList.getTopicInfo() != null) {
                    for (TopicInfoList.TopicInfo topicInfo : topicInfoList.getTopicInfo()) {
                        tmpBrokerIdList.add(topicInfo.getBrokerId());
                    }
                }
            }
        }
        return tmpBrokerIdList;
    }
json class for topic info list from master http service.
inlong-tubemq/tubemq-manager/src/main/java/org/apache/inlong/tubemq/manager/service/tube/TubeHttpTopicInfoList.java