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public class Message implements Serializable {
    private static final long serialVersionUID = 8445773977080406428L;
	//消息主题
    private String topic;
    private int flag;
    //扩展属性
    private Map<String, String> properties;
    //消息体
    private byte[] body;
    //事务ID
    private String transactionId;

    public Message() {}
}

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public class DefaultMQProducer extends ClientConfig implements MQProducer {
    protected final transient DefaultMQProducerImpl defaultMQProducerImpl;
    private final InternalLogger log = ClientLogger.getLog();
    //生产者所属组，消息服务器在回查事务状态时会随机选择该组中任何一个生产者发起事务回查请求
    private String producerGroup;
	//默认topicKey
    private String createTopicKey = TopicValidator.AUTO_CREATE_TOPIC_KEY_TOPIC;
	//默认主题在每一个Broker 队列数量。
    private volatile int defaultTopicQueueNums = 4;
	//发送消息默认超时时间， 默认3s 。
    private int sendMsgTimeout = 3000;
	//消息体超过该值则启用压缩，默认4K
    private int compressMsgBodyOverHowmuch = 1024 * 4;
	//同步方式发送消息重试次数，默认为2 ，总共执行3 次
    private int retryTimesWhenSendFailed = 2;
	//异步方式发送消息重试次数，默认为2
    private int retryTimesWhenSendAsyncFailed = 2;
	//消息重试时选择另外一个Broker 时,是否不等待存储结果就返回， 默认为false 。
    private boolean retryAnotherBrokerWhenNotStoreOK = false;
	//允许发送的最大消息长度，默认为4M
    private int maxMessageSize = 1024 * 1024 * 4; // 4M
    //创建主题
    //key ：目前未实际作用，可以与newTopic 相同。
	//newTopic ： 主题名称。
	//queueNum ：队列数量。
	//topicSysF!ag ：主题系统标签，默认为0 。
	void createTopic(String key, String newTopic, int queueNum, int topicSysFlag);
    //根据时间戳从队列中查找其偏移量
    long searchOffset(MessageQueue mq, long timestamp);
    //查找该消息队列中最大的物理偏移量    
    long maxOffset(MessageQueue mq);
    //查找该消息队列中最小物理偏移量
    long minOffset(MessageQueue mq);
    //根据消息偏移量查找消息
    MessageExt viewMessage(String offsetMsgId);
    //根据条件查询消息
    QueryResult queryMessage(String topic, String key, int maxNum, long begin, long end);
    //根据主题与消息ID 查找消息
    MessageExt viewMessage(String topic,String msgId);
    //同步发送消息，具体发送到主题中的哪个消息队列由负载算法决定
    SendResult send(Message msg);
    //同步发送消息，如果发送超过timeout 则抛出超时异常
    SendResult send(Message msg,long timeout);
    //异步发送消息， send Callback 参数是消息发送成功后的回调方法
    void send(Message msg,SendCallback sendCallback);
    //异步发送消息，如果发送超过timeout 指定的值，则抛出超时异常
    void send(Message msg, SendCallback sendCallback, long timeout);
    //单向消息发送，就是不在乎发送结果，消息发送出去后该方法立即返回
    void sendOneway(Message msg);
    //同步方式发送消息，发送到指定消息队列
    SendResult send(Message msg, MessageQueue mq);
    //异步方式发送消息，发送到指定消息队列
    void send(Message msg, MessageQueue mq, SendCallback sendCallback);
    //单向方式发送消息，发送到指定的消息队列
    void sendOneway(Message msg,MessageQueue mq);
    //消息发送，指定消息选择算法，覆盖消息生产者默认的消息队列负载
    SendResult send(Message msg, MessageQueueSelector selector, Object arg);
    //同步批量消息发送
    SendResult send(Collection<Message> msgs, MessageQueue messageQueue,long timeout);
}

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@Override
public void start() throws MQClientException {
    this.setProducerGroup(withNamespace(this.producerGroup));
    this.defaultMQProducerImpl.start();
    if (null != traceDispatcher) {
        try {
            traceDispatcher.start(this.getNamesrvAddr(), this.getAccessChannel());
        } catch (MQClientException e) {
            log.warn("trace dispatcher start failed ", e);
        }
    }
}

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public void start(final boolean startFactory) throws MQClientException {
    switch (this.serviceState) {
        case CREATE_JUST:
            this.serviceState = ServiceState.START_FAILED;

            this.checkConfig();

            if (!this.defaultMQProducer.getProducerGroup().equals(MixAll.CLIENT_INNER_PRODUCER_GROUP)) {
                this.defaultMQProducer.changeInstanceNameToPID();
            }
			//创建MQClientInstance实例，同一个clientld只会创建一个MQClientInstance
            this.mQClientFactory = MQClientManager.getInstance().getOrCreateMQClientInstance(this.defaultMQProducer, rpcHook);

            boolean registerOK = mQClientFactory.registerProducer(this.defaultMQProducer.getProducerGroup(), this);
            if (!registerOK) {
                this.serviceState = ServiceState.CREATE_JUST;
                throw new MQClientException("The producer group[" + this.defaultMQProducer.getProducerGroup()
                    + "] has been created before, specify another name please." + FAQUrl.suggestTodo(FAQUrl.GROUP_NAME_DUPLICATE_URL),
                    null);
            }

            this.topicPublishInfoTable.put(this.defaultMQProducer.getCreateTopicKey(), new TopicPublishInfo());

            if (startFactory) {
                mQClientFactory.start();
            }

            log.info("the producer [{}] start OK. sendMessageWithVIPChannel={}", this.defaultMQProducer.getProducerGroup(),
                this.defaultMQProducer.isSendMessageWithVIPChannel());
            this.serviceState = ServiceState.RUNNING;
            break;
        case RUNNING:
        case START_FAILED:
        case SHUTDOWN_ALREADY:
            throw new MQClientException("The producer service state not OK, maybe started once, "
                + this.serviceState
                + FAQUrl.suggestTodo(FAQUrl.CLIENT_SERVICE_NOT_OK),
                null);
        default:
            break;
    }

    this.mQClientFactory.sendHeartbeatToAllBrokerWithLock();

    this.timer.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            try {
                RequestFutureTable.scanExpiredRequest();
            } catch (Throwable e) {
                log.error("scan RequestFutureTable exception", e);
            }
        }
    }, 1000 * 3, 1000);
}

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private ConcurrentMap<String, MQClientInstance> factoryTable = new ConcurrentHashMap<String, MQClientInstance>();
public MQClientInstance getOrCreateMQClientInstance(final ClientConfig clientConfig, RPCHook rpcHook) {
    String clientId = clientConfig.buildMQClientId();
    MQClientInstance instance = this.factoryTable.get(clientId);
    if (null == instance) {
        instance =
            new MQClientInstance(clientConfig.cloneClientConfig(),
                this.factoryIndexGenerator.getAndIncrement(), clientId, rpcHook);
        MQClientInstance prev = this.factoryTable.putIfAbsent(clientId, instance);
        if (prev != null) {
            instance = prev;
            log.warn("Returned Previous MQClientInstance for clientId:[{}]", clientId);
        } else {
            log.info("Created new MQClientInstance for clientId:[{}]", clientId);
        }
    }
    return instance;
}

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//默认同步发送，超时时间3S
@Override
public SendResult send(
    Message msg) throws MQClientException, RemotingException, MQBrokerException, InterruptedException {
    //验证消息
    Validators.checkMessage(msg, this);
    msg.setTopic(withNamespace(msg.getTopic()));
    //消息发送
    return this.defaultMQProducerImpl.send(msg);
}

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public static void checkMessage(Message msg, DefaultMQProducer defaultMQProducer)
    throws MQClientException {
    //非空校验
    if (null == msg) {
        throw new MQClientException(ResponseCode.MESSAGE_ILLEGAL, "the message is null");
    }
    // topic 校验主题
    Validators.checkTopic(msg.getTopic());
    Validators.isNotAllowedSendTopic(msg.getTopic());

    // body非空校验
    if (null == msg.getBody()) {
        throw new MQClientException(ResponseCode.MESSAGE_ILLEGAL, "the message body is null");
    }
	//body非空校验
    if (0 == msg.getBody().length) {
        throw new MQClientException(ResponseCode.MESSAGE_ILLEGAL, "the message body length is zero");
    }
	//body长度默认不超过4M
    if (msg.getBody().length > defaultMQProducer.getMaxMessageSize()) {
        throw new MQClientException(ResponseCode.MESSAGE_ILLEGAL,
            "the message body size over max value, MAX: " + defaultMQProducer.getMaxMessageSize());
    }
}

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private SendResult sendDefaultImpl(
    Message msg,
    final CommunicationMode communicationMode,
    final SendCallback sendCallback,
    final long timeout
) throws MQClientException, RemotingException, MQBrokerException, InterruptedException {
    this.makeSureStateOK();
    Validators.checkMessage(msg, this.defaultMQProducer);
    final long invokeID = random.nextLong();
    long beginTimestampFirst = System.currentTimeMillis();
    long beginTimestampPrev = beginTimestampFirst;
    long endTimestamp = beginTimestampFirst;
    //查找主题路由信息
    TopicPublishInfo topicPublishInfo = this.tryToFindTopicPublishInfo(msg.getTopic());
    if (topicPublishInfo != null && topicPublishInfo.ok()) {
        boolean callTimeout = false;
        MessageQueue mq = null;
        Exception exception = null;
        SendResult sendResult = null;
        int timesTotal = communicationMode == CommunicationMode.SYNC ? 1 + this.defaultMQProducer.getRetryTimesWhenSendFailed() : 1;
        int times = 0;
        String[] brokersSent = new String[timesTotal];
        for (; times < timesTotal; times++) {
            String lastBrokerName = null == mq ? null : mq.getBrokerName();
            //选择消息队列
            MessageQueue mqSelected = this.selectOneMessageQueue(topicPublishInfo, lastBrokerName);
            if (mqSelected != null) {
                mq = mqSelected;
                brokersSent[times] = mq.getBrokerName();
                try {
                    beginTimestampPrev = System.currentTimeMillis();
                    if (times > 0) {
                        //Reset topic with namespace during resend.
                        msg.setTopic(this.defaultMQProducer.withNamespace(msg.getTopic()));
                    }
                    long costTime = beginTimestampPrev - beginTimestampFirst;
                    if (timeout < costTime) {
                        callTimeout = true;
                        break;
                    }
					//消息发送
                    sendResult = this.sendKernelImpl(msg, mq, communicationMode, sendCallback, topicPublishInfo, timeout - costTime);
                    endTimestamp = System.currentTimeMillis();
                    //更新失败条目
                    this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, false);
                    switch (communicationMode) {
                        case ASYNC:
                            return null;
                        case ONEWAY:
                            return null;
                        case SYNC:
                            if (sendResult.getSendStatus() != SendStatus.SEND_OK) {
                                if (this.defaultMQProducer.isRetryAnotherBrokerWhenNotStoreOK()) {
                                    continue;
                                }
                            }

                            return sendResult;
                        default:
                            break;
                    }
                } catch (RemotingException e) {
                    endTimestamp = System.currentTimeMillis();
                    this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, true);
                    log.warn(String.format("sendKernelImpl exception, resend at once, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e);
                    log.warn(msg.toString());
                    exception = e;
                    continue;
                } catch (MQClientException e) {
                    endTimestamp = System.currentTimeMillis();
                    this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, true);
                    log.warn(String.format("sendKernelImpl exception, resend at once, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e);
                    log.warn(msg.toString());
                    exception = e;
                    continue;
                } catch (MQBrokerException e) {
                    endTimestamp = System.currentTimeMillis();
                    this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, true);
                    log.warn(String.format("sendKernelImpl exception, resend at once, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e);
                    log.warn(msg.toString());
                    exception = e;
                    switch (e.getResponseCode()) {
                        case ResponseCode.TOPIC_NOT_EXIST:
                        case ResponseCode.SERVICE_NOT_AVAILABLE:
                        case ResponseCode.SYSTEM_ERROR:
                        case ResponseCode.NO_PERMISSION:
                        case ResponseCode.NO_BUYER_ID:
                        case ResponseCode.NOT_IN_CURRENT_UNIT:
                            continue;
                        default:
                            if (sendResult != null) {
                                return sendResult;
                            }

                            throw e;
                    }
                } catch (InterruptedException e) {
                    endTimestamp = System.currentTimeMillis();
                    this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, false);
                    log.warn(String.format("sendKernelImpl exception, throw exception, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e);
                    log.warn(msg.toString());

                    log.warn("sendKernelImpl exception", e);
                    log.warn(msg.toString());
                    throw e;
                }
            } else {
                break;
            }
        }

        if (sendResult != null) {
            return sendResult;
        }

        String info = String.format("Send [%d] times, still failed, cost [%d]ms, Topic: %s, BrokersSent: %s",
            times,
            System.currentTimeMillis() - beginTimestampFirst,
            msg.getTopic(),
            Arrays.toString(brokersSent));

        info += FAQUrl.suggestTodo(FAQUrl.SEND_MSG_FAILED);

        MQClientException mqClientException = new MQClientException(info, exception);
        if (callTimeout) {
            throw new RemotingTooMuchRequestException("sendDefaultImpl call timeout");
        }

        if (exception instanceof MQBrokerException) {
            mqClientException.setResponseCode(((MQBrokerException) exception).getResponseCode());
        } else if (exception instanceof RemotingConnectException) {
            mqClientException.setResponseCode(ClientErrorCode.CONNECT_BROKER_EXCEPTION);
        } else if (exception instanceof RemotingTimeoutException) {
            mqClientException.setResponseCode(ClientErrorCode.ACCESS_BROKER_TIMEOUT);
        } else if (exception instanceof MQClientException) {
            mqClientException.setResponseCode(ClientErrorCode.BROKER_NOT_EXIST_EXCEPTION);
        }

        throw mqClientException;
    }

    validateNameServerSetting();

    throw new MQClientException("No route info of this topic: " + msg.getTopic() + FAQUrl.suggestTodo(FAQUrl.NO_TOPIC_ROUTE_INFO),
        null).setResponseCode(ClientErrorCode.NOT_FOUND_TOPIC_EXCEPTION);
}

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//从本地缓存中获取topic的路由信息，如果没有缓存从NameServer查询该topic的路由信息
private TopicPublishInfo tryToFindTopicPublishInfo(final String topic) {
    TopicPublishInfo topicPublishInfo = this.topicPublishInfoTable.get(topic);
    if (null == topicPublishInfo || !topicPublishInfo.ok()) {
        this.topicPublishInfoTable.putIfAbsent(topic, new TopicPublishInfo());
        //从NameServer获取该topic路由信息
        this.mQClientFactory.updateTopicRouteInfoFromNameServer(topic);
        topicPublishInfo = this.topicPublishInfoTable.get(topic);
    }

    if (topicPublishInfo.isHaveTopicRouterInfo() || topicPublishInfo.ok()) {
        return topicPublishInfo;
    } else {
        //使用默认主题从NameServer获取
        this.mQClientFactory.updateTopicRouteInfoFromNameServer(topic, true, this.defaultMQProducer);
        topicPublishInfo = this.topicPublishInfoTable.get(topic);
        return topicPublishInfo;
    }
}

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public MessageQueue selectOneMessageQueue(final TopicPublishInfo tpInfo, final String lastBrokerName) {
    //sendLatencyFaultEnable=false ，默认不启用Broker 故障延迟机制
    //sendLatencyFaultEnable=true ，启用Broker 故障延迟机制
    if (this.sendLatencyFaultEnable) {
        try {
            int index = tpInfo.getSendWhichQueue().getAndIncrement();
            for (int i = 0; i < tpInfo.getMessageQueueList().size(); i++) {
                int pos = Math.abs(index++) % tpInfo.getMessageQueueList().size();
                if (pos < 0)
                    pos = 0;
                MessageQueue mq = tpInfo.getMessageQueueList().get(pos);
                //验证消息队列是否可用
                if (latencyFaultTolerance.isAvailable(mq.getBrokerName()))
                    return mq;
            }
			//尝试从规避的Broker中选择一个可用的Broker
            final String notBestBroker = latencyFaultTolerance.pickOneAtLeast();
            int writeQueueNums = tpInfo.getQueueIdByBroker(notBestBroker);
            if (writeQueueNums > 0) {
                final MessageQueue mq = tpInfo.selectOneMessageQueue();
                if (notBestBroker != null) {
                    mq.setBrokerName(notBestBroker);
                    mq.setQueueId(tpInfo.getSendWhichQueue().getAndIncrement() % writeQueueNums);
                }
                return mq;
            } else {
                //移除Fault 条目，意味着Broker重新参与路由计算
                latencyFaultTolerance.remove(notBestBroker);
            }
        } catch (Exception e) {
            log.error("Error occurred when selecting message queue", e);
        }

        return tpInfo.selectOneMessageQueue();
    }

    return tpInfo.selectOneMessageQueue(lastBrokerName);
}

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public MessageQueue selectOneMessageQueue(final String lastBrokerName) {
    if (lastBrokerName == null) {
        return selectOneMessageQueue();
    } else {
        for (int i = 0; i < this.messageQueueList.size(); i++) {
            int index = this.sendWhichQueue.getAndIncrement();
            int pos = Math.abs(index) % this.messageQueueList.size();
            if (pos < 0)
                pos = 0;
            MessageQueue mq = this.messageQueueList.get(pos);
            //规避故障Broker
            if (!mq.getBrokerName().equals(lastBrokerName)) {
                return mq;
            }
        }
        return selectOneMessageQueue();
    }
}
//轮询算法，根据队列取模获取
public MessageQueue selectOneMessageQueue() {
    int index = this.sendWhichQueue.getAndIncrement();
    int pos = Math.abs(index) % this.messageQueueList.size();
    if (pos < 0)
        pos = 0;
    return this.messageQueueList.get(pos);
}

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private SendResult sendKernelImpl(final Message msg,
    final MessageQueue mq,
    final CommunicationMode communicationMode,
    final SendCallback sendCallback,
    final TopicPublishInfo topicPublishInfo,
    final long timeout) throws MQClientException, RemotingException, MQBrokerException, InterruptedException {
    long beginStartTime = System.currentTimeMillis();
    //根据MessageQueue获取Broker的网络地址
    String brokerAddr = this.mQClientFactory.findBrokerAddressInPublish(mq.getBrokerName());
    //brokerAddrTable没有该Broker的信息，从NameServer主动获取
    if (null == brokerAddr) {
        tryToFindTopicPublishInfo(mq.getTopic());
        brokerAddr = this.mQClientFactory.findBrokerAddressInPublish(mq.getBrokerName());
    }

    SendMessageContext context = null;
    if (brokerAddr != null) {
        brokerAddr = MixAll.brokerVIPChannel(this.defaultMQProducer.isSendMessageWithVIPChannel(), brokerAddr);

        byte[] prevBody = msg.getBody();
        try {
            //for MessageBatch,ID has been set in the generating process
            //为消息分配全局唯一ID,
            if (!(msg instanceof MessageBatch)) {
                MessageClientIDSetter.setUniqID(msg);
            }

            boolean topicWithNamespace = false;
            if (null != this.mQClientFactory.getClientConfig().getNamespace()) {
                msg.setInstanceId(this.mQClientFactory.getClientConfig().getNamespace());
                topicWithNamespace = true;
            }

            int sysFlag = 0;
            boolean msgBodyCompressed = false;
            //如果消息体超过4K，对消息体采用zip压缩，设置消息标记为COMPRESSED_FLAG
            if (this.tryToCompressMessage(msg)) {
                sysFlag |= MessageSysFlag.COMPRESSED_FLAG;
                msgBodyCompressed = true;
            }
			//如果消息是Prepared消息，设置消息标记为TRANSACTION_PREPARED_TYPE
            final String tranMsg = msg.getProperty(MessageConst.PROPERTY_TRANSACTION_PREPARED);
            if (tranMsg != null && Boolean.parseBoolean(tranMsg)) {
                sysFlag |= MessageSysFlag.TRANSACTION_PREPARED_TYPE;
            }
			
            if (hasCheckForbiddenHook()) {
                CheckForbiddenContext checkForbiddenContext = new CheckForbiddenContext();
                checkForbiddenContext.setNameSrvAddr(this.defaultMQProducer.getNamesrvAddr());
                checkForbiddenContext.setGroup(this.defaultMQProducer.getProducerGroup());
                checkForbiddenContext.setCommunicationMode(communicationMode);
                checkForbiddenContext.setBrokerAddr(brokerAddr);
                checkForbiddenContext.setMessage(msg);
                checkForbiddenContext.setMq(mq);
                checkForbiddenContext.setUnitMode(this.isUnitMode());
                this.executeCheckForbiddenHook(checkForbiddenContext);
            }
			//执行消息发送之前的增强逻辑
            if (this.hasSendMessageHook()) {
                context = new SendMessageContext();
                context.setProducer(this);
                context.setProducerGroup(this.defaultMQProducer.getProducerGroup());
                context.setCommunicationMode(communicationMode);
                context.setBornHost(this.defaultMQProducer.getClientIP());
                context.setBrokerAddr(brokerAddr);
                context.setMessage(msg);
                context.setMq(mq);
                context.setNamespace(this.defaultMQProducer.getNamespace());
                String isTrans = msg.getProperty(MessageConst.PROPERTY_TRANSACTION_PREPARED);
                if (isTrans != null && isTrans.equals("true")) {
                    context.setMsgType(MessageType.Trans_Msg_Half);
                }

                if (msg.getProperty("__STARTDELIVERTIME") != null || msg.getProperty(MessageConst.PROPERTY_DELAY_TIME_LEVEL) != null) {
                    context.setMsgType(MessageType.Delay_Msg);
                }
                this.executeSendMessageHookBefore(context);
            }
			//消息发送请求
            SendMessageRequestHeader requestHeader = new SendMessageRequestHeader();
            //生产者组
            requestHeader.setProducerGroup(this.defaultMQProducer.getProducerGroup());
            //主题名称
            requestHeader.setTopic(msg.getTopic());
            //默认创建主题Key
            requestHeader.setDefaultTopic(this.defaultMQProducer.getCreateTopicKey());
            //该主题在单个Broker 默认队列数
            requestHeader.setDefaultTopicQueueNums(this.defaultMQProducer.getDefaultTopicQueueNums());
            //队列ID （队列序号）
            requestHeader.setQueueId(mq.getQueueId());
            //消息系统标记
            requestHeader.setSysFlag(sysFlag);
            //消息发送时间
            requestHeader.setBornTimestamp(System.currentTimeMillis());
            //消息标记
            requestHeader.setFlag(msg.getFlag());
            //消息扩展属性
            requestHeader.setProperties(MessageDecoder.messageProperties2String(msg.getProperties()));
            //消息重试次数
            requestHeader.setReconsumeTimes(0);
            requestHeader.setUnitMode(this.isUnitMode());
            //是否是批量消息
            requestHeader.setBatch(msg instanceof MessageBatch);
            if (requestHeader.getTopic().startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX)) {
                String reconsumeTimes = MessageAccessor.getReconsumeTime(msg);
                if (reconsumeTimes != null) {
                    requestHeader.setReconsumeTimes(Integer.valueOf(reconsumeTimes));
                    MessageAccessor.clearProperty(msg, MessageConst.PROPERTY_RECONSUME_TIME);
                }

                String maxReconsumeTimes = MessageAccessor.getMaxReconsumeTimes(msg);
                if (maxReconsumeTimes != null) {
                    requestHeader.setMaxReconsumeTimes(Integer.valueOf(maxReconsumeTimes));
                    MessageAccessor.clearProperty(msg, MessageConst.PROPERTY_MAX_RECONSUME_TIMES);
                }
            }

            SendResult sendResult = null;
            //根据消息发送方式，同步、异步、单向方式进行网络传输
            switch (communicationMode) {
                case ASYNC:
                    Message tmpMessage = msg;
                    boolean messageCloned = false;
                    if (msgBodyCompressed) {
                        //If msg body was compressed, msgbody should be reset using prevBody.
                        //Clone new message using commpressed message body and recover origin massage.
                        //Fix bug:https://github.com/apache/rocketmq-externals/issues/66
                        tmpMessage = MessageAccessor.cloneMessage(msg);
                        messageCloned = true;
                        msg.setBody(prevBody);
                    }

                    if (topicWithNamespace) {
                        if (!messageCloned) {
                            tmpMessage = MessageAccessor.cloneMessage(msg);
                            messageCloned = true;
                        }
                        msg.setTopic(NamespaceUtil.withoutNamespace(msg.getTopic(), this.defaultMQProducer.getNamespace()));
                    }

                    long costTimeAsync = System.currentTimeMillis() - beginStartTime;
                    if (timeout < costTimeAsync) {
                        throw new RemotingTooMuchRequestException("sendKernelImpl call timeout");
                    }
                    sendResult = this.mQClientFactory.getMQClientAPIImpl().sendMessage(
                        brokerAddr,
                        mq.getBrokerName(),
                        tmpMessage,
                        requestHeader,
                        timeout - costTimeAsync,
                        communicationMode,
                        sendCallback,
                        topicPublishInfo,
                        this.mQClientFactory,
                        this.defaultMQProducer.getRetryTimesWhenSendAsyncFailed(),
                        context,
                        this);
                    break;
                case ONEWAY:
                case SYNC:
                    long costTimeSync = System.currentTimeMillis() - beginStartTime;
                    if (timeout < costTimeSync) {
                        throw new RemotingTooMuchRequestException("sendKernelImpl call timeout");
                    }
                    sendResult = this.mQClientFactory.getMQClientAPIImpl().sendMessage(
                        brokerAddr,
                        mq.getBrokerName(),
                        msg,
                        requestHeader,
                        timeout - costTimeSync,
                        communicationMode,
                        context,
                        this);
                    break;
                default:
                    assert false;
                    break;
            }
			//发送消息后after逻辑
            if (this.hasSendMessageHook()) {
                context.setSendResult(sendResult);
                this.executeSendMessageHookAfter(context);
            }

            return sendResult;
        } catch (RemotingException e) {
            if (this.hasSendMessageHook()) {
                context.setException(e);
                this.executeSendMessageHookAfter(context);
            }
            throw e;
        } catch (MQBrokerException e) {
            if (this.hasSendMessageHook()) {
                context.setException(e);
                this.executeSendMessageHookAfter(context);
            }
            throw e;
        } catch (InterruptedException e) {
            if (this.hasSendMessageHook()) {
                context.setException(e);
                this.executeSendMessageHookAfter(context);
            }
            throw e;
        } finally {
            msg.setBody(prevBody);
            msg.setTopic(NamespaceUtil.withoutNamespace(msg.getTopic(), this.defaultMQProducer.getNamespace()));
        }
    }
    throw new MQClientException("The broker[" + mq.getBrokerName() + "] not exist", null);
}

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public SendResult sendMessage(
    final String addr,
    final String brokerName,
    final Message msg,
    final SendMessageRequestHeader requestHeader,
    final long timeoutMillis,
    final CommunicationMode communicationMode,
    final SendCallback sendCallback,
    final TopicPublishInfo topicPublishInfo,
    final MQClientInstance instance,
    final int retryTimesWhenSendFailed,
    final SendMessageContext context,
    final DefaultMQProducerImpl producer
) throws RemotingException, MQBrokerException, InterruptedException {
    long beginStartTime = System.currentTimeMillis();
    RemotingCommand request = null;
    String msgType = msg.getProperty(MessageConst.PROPERTY_MESSAGE_TYPE);
    boolean isReply = msgType != null && msgType.equals(MixAll.REPLY_MESSAGE_FLAG);
    if (isReply) {
        if (sendSmartMsg) {
            SendMessageRequestHeaderV2 requestHeaderV2 = SendMessageRequestHeaderV2.createSendMessageRequestHeaderV2(requestHeader);
            request = RemotingCommand.createRequestCommand(RequestCode.SEND_REPLY_MESSAGE_V2, requestHeaderV2);
        } else {
            request = RemotingCommand.createRequestCommand(RequestCode.SEND_REPLY_MESSAGE, requestHeader);
        }
    } else {
        if (sendSmartMsg || msg instanceof MessageBatch) {
            SendMessageRequestHeaderV2 requestHeaderV2 = SendMessageRequestHeaderV2.createSendMessageRequestHeaderV2(requestHeader);
            request = RemotingCommand.createRequestCommand(msg instanceof MessageBatch ? RequestCode.SEND_BATCH_MESSAGE : RequestCode.SEND_MESSAGE_V2, requestHeaderV2);
        } else {
            request = RemotingCommand.createRequestCommand(RequestCode.SEND_MESSAGE, requestHeader);
        }
    }
    request.setBody(msg.getBody());

    switch (communicationMode) {
        case ONEWAY:
            this.remotingClient.invokeOneway(addr, request, timeoutMillis);
            return null;
        case ASYNC:
            final AtomicInteger times = new AtomicInteger();
            long costTimeAsync = System.currentTimeMillis() - beginStartTime;
            if (timeoutMillis < costTimeAsync) {
                throw new RemotingTooMuchRequestException("sendMessage call timeout");
            }
            this.sendMessageAsync(addr, brokerName, msg, timeoutMillis - costTimeAsync, request, sendCallback, topicPublishInfo, instance,
                retryTimesWhenSendFailed, times, context, producer);
            return null;
        case SYNC:
            long costTimeSync = System.currentTimeMillis() - beginStartTime;
            if (timeoutMillis < costTimeSync) {
                throw new RemotingTooMuchRequestException("sendMessage call timeout");
            }
            return this.sendMessageSync(addr, brokerName, msg, timeoutMillis - costTimeSync, request);
        default:
            assert false;
            break;
    }

    return null;
}

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@Override
public SendResult send(
    Collection<Message> msgs) throws MQClientException, RemotingException, MQBrokerException, InterruptedException {
    return this.defaultMQProducerImpl.send(batch(msgs));
}

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private MessageBatch batch(Collection<Message> msgs) throws MQClientException {
    MessageBatch msgBatch;
    try {
        msgBatch = MessageBatch.generateFromList(msgs);
        for (Message message : msgBatch) {
            Validators.checkMessage(message, this);
            MessageClientIDSetter.setUniqID(message);
            message.setTopic(withNamespace(message.getTopic()));
        }
        msgBatch.setBody(msgBatch.encode());
    } catch (Exception e) {
        throw new MQClientException("Failed to initiate the MessageBatch", e);
    }
    msgBatch.setTopic(withNamespace(msgBatch.getTopic()));
    return msgBatch;
}

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public byte[] encode() {
    return MessageDecoder.encodeMessages(messages);
}

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public static byte[] encodeMessages(List<Message> messages) {
    //TO DO refactor, accumulate in one buffer, avoid copies
    List<byte[]> encodedMessages = new ArrayList<byte[]>(messages.size());
    int allSize = 0;
    for (Message message : messages) {
        byte[] tmp = encodeMessage(message);
        encodedMessages.add(tmp);
        allSize += tmp.length;
    }
    byte[] allBytes = new byte[allSize];
    int pos = 0;
    for (byte[] bytes : encodedMessages) {
        System.arraycopy(bytes, 0, allBytes, pos, bytes.length);
        pos += bytes.length;
    }
    return allBytes;
}

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public static byte[] encodeMessage(Message message) {
    //only need flag, body, properties
    byte[] body = message.getBody();
    int bodyLen = body.length;
    String properties = messageProperties2String(message.getProperties());
    byte[] propertiesBytes = properties.getBytes(CHARSET_UTF8);
    //note properties length must not more than Short.MAX
    short propertiesLength = (short) propertiesBytes.length;
    int sysFlag = message.getFlag();
    int storeSize = 4 // 1 TOTALSIZE
        + 4 // 2 MAGICCOD
        + 4 // 3 BODYCRC
        + 4 // 4 FLAG
        + 4 + bodyLen // 4 BODY
        + 2 + propertiesLength;
    ByteBuffer byteBuffer = ByteBuffer.allocate(storeSize);
    // 1 TOTALSIZE
    byteBuffer.putInt(storeSize);

    // 2 MAGICCODE
    byteBuffer.putInt(0);

    // 3 BODYCRC
    byteBuffer.putInt(0);

    // 4 FLAG
    int flag = message.getFlag();
    byteBuffer.putInt(flag);

    // 5 BODY
    byteBuffer.putInt(bodyLen);
    byteBuffer.put(body);

    // 6 properties
    byteBuffer.putShort(propertiesLength);
    byteBuffer.put(propertiesBytes);

    return byteBuffer.array();
}