public TopicRouteData pickupTopicRouteData()

in namesrv/src/main/java/org/apache/rocketmq/namesrv/routeinfo/RouteInfoManager.java [700:801]
81 lines of code
24 McCabe index (conditional complexity)

    public TopicRouteData pickupTopicRouteData(final String topic) {
        TopicRouteData topicRouteData = new TopicRouteData();
        boolean foundQueueData = false;
        boolean foundBrokerData = false;
        List<BrokerData> brokerDataList = new LinkedList<>();
        topicRouteData.setBrokerDatas(brokerDataList);

        HashMap<String, List<String>> filterServerMap = new HashMap<>();
        topicRouteData.setFilterServerTable(filterServerMap);

        try {
            this.lock.readLock().lockInterruptibly();
            Map<String, QueueData> queueDataMap = this.topicQueueTable.get(topic);
            if (queueDataMap != null) {
                topicRouteData.setQueueDatas(new ArrayList<>(queueDataMap.values()));
                foundQueueData = true;

                Set<String> brokerNameSet = new HashSet<>(queueDataMap.keySet());

                for (String brokerName : brokerNameSet) {
                    BrokerData brokerData = this.brokerAddrTable.get(brokerName);
                    if (null == brokerData) {
                        continue;
                    }
                    BrokerData brokerDataClone = new BrokerData(brokerData);

                    brokerDataList.add(brokerDataClone);
                    foundBrokerData = true;
                    if (filterServerTable.isEmpty()) {
                        continue;
                    }
                    for (final String brokerAddr : brokerDataClone.getBrokerAddrs().values()) {
                        BrokerAddrInfo brokerAddrInfo = new BrokerAddrInfo(brokerDataClone.getCluster(), brokerAddr);
                        List<String> filterServerList = this.filterServerTable.get(brokerAddrInfo);
                        filterServerMap.put(brokerAddr, filterServerList);
                    }

                }
            }
        } catch (Exception e) {
            log.error("pickupTopicRouteData Exception", e);
        } finally {
            this.lock.readLock().unlock();
        }

        log.debug("pickupTopicRouteData {} {}", topic, topicRouteData);

        if (foundBrokerData && foundQueueData) {

            topicRouteData.setTopicQueueMappingByBroker(this.topicQueueMappingInfoTable.get(topic));

            if (!namesrvConfig.isSupportActingMaster()) {
                return topicRouteData;
            }

            if (topic.startsWith(TopicValidator.SYNC_BROKER_MEMBER_GROUP_PREFIX)) {
                return topicRouteData;
            }

            if (topicRouteData.getBrokerDatas().size() == 0 || topicRouteData.getQueueDatas().size() == 0) {
                return topicRouteData;
            }

            boolean needActingMaster = false;

            for (final BrokerData brokerData : topicRouteData.getBrokerDatas()) {
                if (brokerData.getBrokerAddrs().size() != 0
                    && !brokerData.getBrokerAddrs().containsKey(MixAll.MASTER_ID)) {
                    needActingMaster = true;
                    break;
                }
            }

            if (!needActingMaster) {
                return topicRouteData;
            }

            for (final BrokerData brokerData : topicRouteData.getBrokerDatas()) {
                final HashMap<Long, String> brokerAddrs = brokerData.getBrokerAddrs();
                if (brokerAddrs.size() == 0 || brokerAddrs.containsKey(MixAll.MASTER_ID) || !brokerData.isEnableActingMaster()) {
                    continue;
                }

                // No master
                for (final QueueData queueData : topicRouteData.getQueueDatas()) {
                    if (queueData.getBrokerName().equals(brokerData.getBrokerName())) {
                        if (!PermName.isWriteable(queueData.getPerm())) {
                            final Long minBrokerId = Collections.min(brokerAddrs.keySet());
                            final String actingMasterAddr = brokerAddrs.remove(minBrokerId);
                            brokerAddrs.put(MixAll.MASTER_ID, actingMasterAddr);
                        }
                        break;
                    }
                }

            }

            return topicRouteData;
        }

        return null;
    }