聊聊rocketmq的ConsumerManageProcessor

序

本文主要研究一下rocketmq的ConsumerManageProcessor

NettyRequestProcessor

rocketmq-all-4.6.0-source-release/remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRequestProcessor.java

public interface NettyRequestProcessor {
    RemotingCommand processRequest(ChannelHandlerContext ctx, RemotingCommand request)
        throws Exception;

    boolean rejectRequest();
}

• NettyRequestProcessor接口定义了processRequest、rejectRequest方法

ConsumerManageProcessor

rocketmq-all-4.6.0-source-release/broker/src/main/java/org/apache/rocketmq/broker/processor/ConsumerManageProcessor.java

public class ConsumerManageProcessor implements NettyRequestProcessor {
    private static final InternalLogger log = InternalLoggerFactory.getLogger(LoggerName.BROKER_LOGGER_NAME);

    private final BrokerController brokerController;

    public ConsumerManageProcessor(final BrokerController brokerController) {
        this.brokerController = brokerController;
    }

    @Override
    public RemotingCommand processRequest(ChannelHandlerContext ctx, RemotingCommand request)
        throws RemotingCommandException {
        switch (request.getCode()) {
            case RequestCode.GET_CONSUMER_LIST_BY_GROUP:
                return this.getConsumerListByGroup(ctx, request);
            case RequestCode.UPDATE_CONSUMER_OFFSET:
                return this.updateConsumerOffset(ctx, request);
            case RequestCode.QUERY_CONSUMER_OFFSET:
                return this.queryConsumerOffset(ctx, request);
            default:
                break;
        }
        return null;
    }

    @Override
    public boolean rejectRequest() {
        return false;
    }

    //......
}

• ConsumerManageProcessor实现了NettyRequestProcessor接口，其processRequest方法只处理code为RequestCode.GET_CONSUMER_LIST_BY_GROUP、RequestCode.UPDATE_CONSUMER_OFFSET或者RequestCode.QUERY_CONSUMER_OFFSET的request；其中针对RequestCode.GET_CONSUMER_LIST_BY_GROUP执行getConsumerListByGroup方法，针对RequestCode.UPDATE_CONSUMER_OFFSET执行updateConsumerOffset方法，针对RequestCode.QUERY_CONSUMER_OFFSET执行queryConsumerOffset方法；其rejectRequest返回false

getConsumerListByGroup

rocketmq-all-4.6.0-source-release/broker/src/main/java/org/apache/rocketmq/broker/processor/ConsumerManageProcessor.java

public class ConsumerManageProcessor implements NettyRequestProcessor {

    //......

    public RemotingCommand getConsumerListByGroup(ChannelHandlerContext ctx, RemotingCommand request)
        throws RemotingCommandException {
        final RemotingCommand response =
            RemotingCommand.createResponseCommand(GetConsumerListByGroupResponseHeader.class);
        final GetConsumerListByGroupRequestHeader requestHeader =
            (GetConsumerListByGroupRequestHeader) request
                .decodeCommandCustomHeader(GetConsumerListByGroupRequestHeader.class);

        ConsumerGroupInfo consumerGroupInfo =
            this.brokerController.getConsumerManager().getConsumerGroupInfo(
                requestHeader.getConsumerGroup());
        if (consumerGroupInfo != null) {
            List<String> clientIds = consumerGroupInfo.getAllClientId();
            if (!clientIds.isEmpty()) {
                GetConsumerListByGroupResponseBody body = new GetConsumerListByGroupResponseBody();
                body.setConsumerIdList(clientIds);
                response.setBody(body.encode());
                response.setCode(ResponseCode.SUCCESS);
                response.setRemark(null);
                return response;
            } else {
                log.warn("getAllClientId failed, {} {}", requestHeader.getConsumerGroup(),
                    RemotingHelper.parseChannelRemoteAddr(ctx.channel()));
            }
        } else {
            log.warn("getConsumerGroupInfo failed, {} {}", requestHeader.getConsumerGroup(),
                RemotingHelper.parseChannelRemoteAddr(ctx.channel()));
        }

        response.setCode(ResponseCode.SYSTEM_ERROR);
        response.setRemark("no consumer for this group, " + requestHeader.getConsumerGroup());
        return response;
    }

    //......
}

• getConsumerListByGroup方法通过brokerController.getConsumerManager().getConsumerGroupInfo(requestHeader.getConsumerGroup())获取consumerGroupInfo

updateConsumerOffset

rocketmq-all-4.6.0-source-release/broker/src/main/java/org/apache/rocketmq/broker/processor/ConsumerManageProcessor.java

public class ConsumerManageProcessor implements NettyRequestProcessor {

    //......

    private RemotingCommand updateConsumerOffset(ChannelHandlerContext ctx, RemotingCommand request)
        throws RemotingCommandException {
        final RemotingCommand response =
            RemotingCommand.createResponseCommand(UpdateConsumerOffsetResponseHeader.class);
        final UpdateConsumerOffsetRequestHeader requestHeader =
            (UpdateConsumerOffsetRequestHeader) request
                .decodeCommandCustomHeader(UpdateConsumerOffsetRequestHeader.class);
        this.brokerController.getConsumerOffsetManager().commitOffset(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), requestHeader.getConsumerGroup(),
            requestHeader.getTopic(), requestHeader.getQueueId(), requestHeader.getCommitOffset());
        response.setCode(ResponseCode.SUCCESS);
        response.setRemark(null);
        return response;
    }

    //......
}

• updateConsumerOffset方法主要是执行brokerController.getConsumerOffsetManager().commitOffset

queryConsumerOffset

rocketmq-all-4.6.0-source-release/broker/src/main/java/org/apache/rocketmq/broker/processor/ConsumerManageProcessor.java

public class ConsumerManageProcessor implements NettyRequestProcessor {

    //......

    private RemotingCommand queryConsumerOffset(ChannelHandlerContext ctx, RemotingCommand request)
        throws RemotingCommandException {
        final RemotingCommand response =
            RemotingCommand.createResponseCommand(QueryConsumerOffsetResponseHeader.class);
        final QueryConsumerOffsetResponseHeader responseHeader =
            (QueryConsumerOffsetResponseHeader) response.readCustomHeader();
        final QueryConsumerOffsetRequestHeader requestHeader =
            (QueryConsumerOffsetRequestHeader) request
                .decodeCommandCustomHeader(QueryConsumerOffsetRequestHeader.class);

        long offset =
            this.brokerController.getConsumerOffsetManager().queryOffset(
                requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getQueueId());

        if (offset >= 0) {
            responseHeader.setOffset(offset);
            response.setCode(ResponseCode.SUCCESS);
            response.setRemark(null);
        } else {
            long minOffset =
                this.brokerController.getMessageStore().getMinOffsetInQueue(requestHeader.getTopic(),
                    requestHeader.getQueueId());
            if (minOffset <= 0
                && !this.brokerController.getMessageStore().checkInDiskByConsumeOffset(
                requestHeader.getTopic(), requestHeader.getQueueId(), 0)) {
                responseHeader.setOffset(0L);
                response.setCode(ResponseCode.SUCCESS);
                response.setRemark(null);
            } else {
                response.setCode(ResponseCode.QUERY_NOT_FOUND);
                response.setRemark("Not found, V3_0_6_SNAPSHOT maybe this group consumer boot first");
            }
        }

        return response;
    }

    //......
}

• queryConsumerOffset方法主要是通过brokerController.getConsumerOffsetManager().queryOffset(requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getQueueId())获取指定consumerGroup、topic及queueId的offset

小结

ConsumerManageProcessor实现了NettyRequestProcessor接口，其processRequest方法只处理code为RequestCode.GET_CONSUMER_LIST_BY_GROUP、RequestCode.UPDATE_CONSUMER_OFFSET或者RequestCode.QUERY_CONSUMER_OFFSET的request；其中针对RequestCode.GET_CONSUMER_LIST_BY_GROUP执行getConsumerListByGroup方法，针对RequestCode.UPDATE_CONSUMER_OFFSET执行updateConsumerOffset方法，针对RequestCode.QUERY_CONSUMER_OFFSET执行queryConsumerOffset方法；其rejectRequest返回false

doc

• ConsumerManageProcessor