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  • rocketmq有序消息

    RocketMQ提供的顺序消费消息实现是使用的FIFO 先进先出算法

    Producer消息发送

    public class Producer {
        public static void main(String[] args) throws UnsupportedEncodingException {
            try {
                MQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
                producer.start();
                String[] tags = new String[] {"TagA", "TagB", "TagC", "TagD", "TagE"};
                for (int i = 0; i < 100; i++) {
                    int orderId = i % 10;
                    Message msg =
                        new Message("TopicTestjjj", tags[i % tags.length], "KEY" + i,
                            ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET));
                    SendResult sendResult = producer.send(msg, new MessageQueueSelector() {
                        @Override
                        public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
                            Integer id = (Integer) arg;
                            int index = id % mqs.size();
                            return mqs.get(index);
                        }
                    }, orderId);
                    System.out.printf("%s%n", sendResult);
                }
                producer.shutdown();
            } catch (MQClientException | RemotingException | MQBrokerException | InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    Consumer消息消费

    public class Consumer {
    
        public static void main(String[] args) throws MQClientException {
            DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_3");
    
            consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
    
            consumer.subscribe("TopicTest", "TagA || TagC || TagD");
    
            consumer.registerMessageListener(new MessageListenerOrderly() {
                AtomicLong consumeTimes = new AtomicLong(0);
    
                @Override
                public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) {
                    context.setAutoCommit(false);
                    System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                    this.consumeTimes.incrementAndGet();
                    if ((this.consumeTimes.get() % 2) == 0) {
                        return ConsumeOrderlyStatus.SUCCESS;
                    } else if ((this.consumeTimes.get() % 3) == 0) {
                        return ConsumeOrderlyStatus.ROLLBACK;
                    } else if ((this.consumeTimes.get() % 4) == 0) {
                        return ConsumeOrderlyStatus.COMMIT;
                    } else if ((this.consumeTimes.get() % 5) == 0) {
                        context.setSuspendCurrentQueueTimeMillis(3000);
                        return ConsumeOrderlyStatus.SUSPEND_CURRENT_QUEUE_A_MOMENT;
                    }
    
                    return ConsumeOrderlyStatus.SUCCESS;
                }
            });
    
            consumer.start();
            System.out.printf("Consumer Started.%n");
        }
    
    }

    笑笑笑技术圈

     
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  • 原文地址:https://www.cnblogs.com/peachyy/p/9406541.html
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