rocketmq_004_延迟消费

逻辑

发送端，执行Message对象的setDelayTimeLevel();

延迟级别

级别从1到18，时常分别为 1s 5s 10s 30s 1m 2m 3m 4m 5m 6m 7m 8m 9m 10m 20m 30m 1h 2h

demo

1、先伪造一个订单集合

public class OrderStep {
    private Long orderId;
    private String desc;

    public OrderStep(){}

    public OrderStep(Long orderId, String desc) {
        this.orderId = orderId;
        this.desc = desc;
    }

    public Long getOrderId() {
        return orderId;
    }

    public void setOrderId(Long orderId) {
        this.orderId = orderId;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    @Override
    public String toString() {
        return "OrderStep{" +
                "orderId=" + orderId +
                ", desc='" + desc + '\'' +
                '}';
    }

    public static List buildOrders(){
        List orderSteps = new ArrayList<>();
        orderSteps.add(new OrderStep(00001L,"创建"));
        orderSteps.add(new OrderStep(00001L,"付款"));
        orderSteps.add(new OrderStep(00001L,"消费"));
        orderSteps.add(new OrderStep(00001L,"完成"));
        orderSteps.add(new OrderStep(00002L,"创建"));
        orderSteps.add(new OrderStep(00002L,"付款"));
        orderSteps.add(new OrderStep(00002L,"消费"));
        orderSteps.add(new OrderStep(00002L,"完成"));
        orderSteps.add(new OrderStep(00003L,"创建"));
        orderSteps.add(new OrderStep(00003L,"付款"));
        orderSteps.add(new OrderStep(00003L,"消费"));
        orderSteps.add(new OrderStep(00003L,"完成"));
        orderSteps.add(new OrderStep(00004L,"创建"));
        orderSteps.add(new OrderStep(00004L,"付款"));
        orderSteps.add(new OrderStep(00004L,"消费"));
        orderSteps.add(new OrderStep(00004L,"完成"));
        return orderSteps;
    }
}

2、延迟模式发送订单集合

public class SyncDelayProducer {
    public static void main(String[] args) throws InterruptedException, RemotingException, MQClientException, MQBrokerException {
        //        1.创建消息生产者，并且制定生产者组名
        DefaultMQProducer producer = new DefaultMQProducer("group1");
//        设置超时时间
        producer.setSendMsgTimeout(10000);
//        2.指定namesrv地址
        producer.setNamesrvAddr("192.168.48.128:9876;192.168.48.137:9876");
//        producer.setNamesrvAddr("47.96.165.93:9876;106.52.131.197:9876");
//        3.启动producer
        try {
            producer.start();
        } catch (
                MQClientException e) {
            e.printStackTrace();
        }

        List orderStepList = OrderStep.buildOrders();

        for (OrderStep order: orderStepList){
//        4.创建消息对象，指定主题topic,tag和消息体
            Message msg = new Message("delayTopic","delay","delayOrder"+order.getOrderId(),order.getDesc().getBytes());
            msg.setDelayTimeLevel(3);
//        5.发送消息,参数1：消息对象；参数2：消息队列的选择器；参数3：选择队列的业务标识（orderId）
            SendResult result = producer.send(msg, new MessageQueueSelector() {
                /**
                 *
                 * @param list  消息队列集合
                 * @param message   消息对象
                 * @param o  业务标识
                 * @return
                 */
                @Override
                public MessageQueue select(List list, Message message, Object o) {
                    long orderId = (long) o;
                    int index = (int) (orderId%list.size());
                    return list.get(index);
                }
            },order.getOrderId());

            SendStatus status = result.getSendStatus();

            String msgId = result.getMsgId();

            int queueId = result.getMessageQueue().getQueueId();

            System.out.println("send status:"+status+",message ID:"+msgId+",queue:"+queueId+",desc:"+order.getDesc());
        }
//                * 关闭producer
        producer.shutdown();
    }
}

3、消费订单，查看每个订单的延迟打印时间（level是3,但是受制于各种影响，估计打印时间要20s左右） 

public class DelayConsumer {
    public static void main(String[] args) {
        consumer();
    }

    public static void consumer(){
        //        1 创建消费者Consumer ，并确定消费者组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group1");
//        2 指定NameServer地址
        consumer.setNamesrvAddr("192.168.48.128:9876;192.168.48.137:9876");
//        consumer.setNamesrvAddr("106.52.131.197:9876;47.96.165.93:9876");
        try {
//            3 订阅主题Topic和Tag
            consumer.subscribe("delayTopic","*");
//        4 设置回调函数，处理消息
            consumer.registerMessageListener(new MessageListenerConcurrently() {
                @Override
                public ConsumeConcurrentlyStatus consumeMessage(List list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                    for(MessageExt msg:list){
//        延迟时间 = 消费时间-存储到队列时间
                        System.out.println(Thread.currentThread().getName()+",延迟时间："+(System.currentTimeMillis()-msg.getStoreTimestamp()));
                    }
                    return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                }
            });
//        5 启动消息内容
            consumer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }
}

打印结果 

ConsumeMessageThread_4,延迟时间：18541
ConsumeMessageThread_10,延迟时间：-28781067
ConsumeMessageThread_12,延迟时间：-28781111
ConsumeMessageThread_6,延迟时间：-28781075
ConsumeMessageThread_8,延迟时间：-28781078
ConsumeMessageThread_11,延迟时间：-28781069
ConsumeMessageThread_2,延迟时间：-28781072
ConsumeMessageThread_1,延迟时间：-28781061
ConsumeMessageThread_14,延迟时间：18479
ConsumeMessageThread_13,延迟时间：-28781017
ConsumeMessageThread_15,延迟时间：-28781022
ConsumeMessageThread_7,延迟时间：18515
ConsumeMessageThread_9,延迟时间：-28780995
ConsumeMessageThread_5,延迟时间：-28781063
ConsumeMessageThread_3,延迟时间：-28780952
ConsumeMessageThread_16,延迟时间：18454

注意

不支持广播消费模式