nameserver路由发现

nameserver路由发现

主要代码在ClientRequestProcessor类中

public RemotingCommand getRouteInfoByTopic(ChannelHandlerContext ctx,
    RemotingCommand request) throws RemotingCommandException {
    final RemotingCommand response = RemotingCommand.createResponseCommand(null);
    final GetRouteInfoRequestHeader requestHeader =
        (GetRouteInfoRequestHeader) request.decodeCommandCustomHeader(GetRouteInfoRequestHeader.class);

//调用RouterlnfoManager的方法，从路由表topicQueueTable、brokerAddrTable、filterServerTable中分别填充TopicRouteData中的List<Queu巳Data＞、List<BrokerData＞和filterServer地址表
    TopicRouteData topicRouteData = this.namesrvController.getRouteInfoManager().pickupTopicRouteData(requestHeader.getTopic());

    if (topicRouteData != null) {
    //如果找到主题对应的路由信息并且该主题为顺序消息，则从NameServer KVconfig中获取关于顺序消息相关的配置填充路由信息。
        if (this.namesrvController.getNamesrvConfig().isOrderMessageEnable()) {
            String orderTopicConf =
                this.namesrvController.getKvConfigManager().getKVConfig(NamesrvUtil.NAMESPACE_ORDER_TOPIC_CONFIG,
                    requestHeader.getTopic());
            topicRouteData.setOrderTopicConf(orderTopicConf);
        }

        byte[] content;
        Boolean standardJsonOnly = requestHeader.getAcceptStandardJsonOnly();
        if (request.getVersion() >= MQVersion.Version.V4_9_4.ordinal() || null != standardJsonOnly && standardJsonOnly) {
            content = topicRouteData.encode(SerializerFeature.BrowserCompatible,
                SerializerFeature.QuoteFieldNames, SerializerFeature.SkipTransientField,
                SerializerFeature.MapSortField);
        } else {
            content = topicRouteData.encode();
        }

        response.setBody(content);
        response.setCode(ResponseCode.SUCCESS);
        response.setRemark(null);
        return response;
    }

    response.setCode(ResponseCode.TOPIC_NOT_EXIST);
    response.setRemark("No topic route info in name server for the topic: " + requestHeader.getTopic()
        + FAQUrl.suggestTodo(FAQUrl.APPLY_TOPIC_URL));
    return response;
}