图文并茂讲解RocketMQ消息类别
目录
- 1、同步消息
- 2、异步消息
- 3、单向消息
1、同步消息
即时性较强,重要的消息,且必须有回执的消息,例如短信,通知(转账成功)
生产者:
public class Producer { public static void main(String[] args) throws Exception{ DefaultMQProducer producer=new DefaultMQProducer("group1"); producer.setNamesrvAddr("192.168.23.127:9876"); producer.start(); for (int i = 1; i <= 5; i++) { Message msg = new Message("topic2",("同步消息:hello rocketmq "+i).getBytes("UTF-8")); //同步消息发送 SendResult result = producer.send(msg); System.out.println("返回结果:"+result); } producer.shutdown(); } }
消费者:
public class Consumer { public static void main(String[] args) throws Exception{ DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("group1"); consumer.setNamesrvAddr("192.168.23.127:9876"); consumer.subscribe("topic2","*"); consumer.registerMessageListener(new MessageListenerConcurrently() { @Override public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) { for (MessageExt msg : list) { //System.out.println("收到消息:"+msg); System.out.println("消息:"+new String(msg.getBody())); } return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;// 成功处理, mq 收到这个 标记后相同的消息讲不会再次发给消费者 } }); consumer.start();// 开启多线程 监控消息,持续运行 System.out.println("接收消息服务已运行"); } }
测试:
2、异步消息
即时性较弱,但需要有回执的消息,例如订单中的某些信息
生产者:
public class Producer { public static void main(String[] args) throws Exception{ DefaultMQProducer producer=new DefaultMQProducer("group1"); producer.setNamesrvAddr("192.168.23.127:9876"); producer.start(); for (int i = 1; i <= 5; i++) { //异步消息发送 Message msg = new Message("topic2",("异步消息:hello rocketmq "+i).getBytes("UTF-8")); producer.send(msg, new SendCallback() { //表示成功返回结果 @Override public void onSuccess(SendResult sendResult) { System.out.println(sendResult); } //表示发送消息失败 @Override public void onException(Throwable throwable) { System.out.println(throwable); } }); } //添加一个休眠操作,确保异步消息返回后能够输出 TimeUnit.SECONDS.sleep(10); producer.shutdown(); } }
消费者:
public class Consumer { public static void main(String[] args) throws Exception{ DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("group1"); consumer.setNamesrvAddr("192.168.23.127:9876"); consumer.subscribe("topic2","*"); consumer.registerMessageListener(new MessageListenerConcurrently() { @Override public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) { for (MessageExt msg : list) { //System.out.println("收到消息:"+msg); System.out.println("消息:"+new String(msg.getBody())); } return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;// 成功处理, mq 收到这个 标记后相同的消息讲不会再次发给消费者 } }); consumer.start();// 开启多线程 监控消息,持续运行 System.out.println("接收消息服务已运行"); } }
测试:
3、单向消息
不需要有回执的消息,例如日志类消息
生产者:
public class Producer { public static void main(String[] args) throws Exception{ DefaultMQProducer producer=new DefaultMQProducer("group1"); producer.setNamesrvAddr("192.168.23.127:9876"); producer.start(); for (int i = 1; i <= 5; i++) { //单向消息 Message msg = new Message("topic2",("单向消息:hello rocketmq "+i).getBytes("UTF-8")); producer.sendOneway(msg); } //添加一个休眠操作,确保异步消息返回后能够输出 TimeUnit.SECONDS.sleep(10); producer.shutdown(); } }
消费者代码同上
测试:
总结 同步消息
SendResult result = producer.send(msg);
异步消息(回调处理结果必须在生产者进程结束前执行,否则回调无法正确执行)
producer.send(msg, new SendCallback() { //表示成功返回结果 @Override public void onSuccess(SendResult sendResult) { System.out.println(sendResult); } //表示发送消息失败 @Override public void onException(Throwable throwable) { System.out.println(throwable); } });
单向消息
producer.sendOneway(msg);
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