序
redis提供了简单的发布订阅功能，对于一些合适的场景(比如不要求消费者不在线时也能收到离线消息)，比起专业的MQ来说，用起来更简单些。本文主要是记录下怎么在SpringBoot里头使用redis的发布订阅功能。
定义生产者
配置
@Bean MyPublisher redisPublisher(RedisConnectionFactory factory) { return new MyPublisher( redisTemplate(factory), topic() ); } @Bean ChannelTopic topic() { return new ChannelTopic( "pubsub:queue" ); }
生产者实例
public class MyPublisher { private final RedisTemplate template; private final ChannelTopic topic; private final AtomicLong counter = new AtomicLong( 0 ); public MyPublisher( final RedisTemplate template, final ChannelTopic topic ) { this.template = template; this.topic = topic; } @Scheduled( fixedDelay = 100 ) public void publish() { template.convertAndSend( topic.getTopic(), "Message " + counter.incrementAndGet() + ", " + Thread.currentThread().getName() ); } }
定义消费者
配置
//subscribe @Bean MessageListenerAdapter messageListener() { return new MessageListenerAdapter( new MyMessageListener() ); } @Bean RedisMessageListenerContainer redisContainer(RedisConnectionFactory factory) { final RedisMessageListenerContainer container = new RedisMessageListenerContainer(); container.setConnectionFactory(factory); container.addMessageListener(messageListener(), topic()); return container; }
消费者实例
public class MyMessageListener implements MessageListener { @Override public void onMessage( final Message message, final byte[] pattern ) { System.out.println( "Message received: " + message.toString() ); } }
运行
. ____ _ __ _ _ / / ___'_ __ _ _(_)_ __ __ _ ( ( )___ | '_ | '_| | '_ / _` | / ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |___, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.3.2.RELEASE) 2016-02-16 00:14:08.190 INFO 1481 --- [ main] com.codecraft.RedisdemoApplication : Starting RedisdemoApplication on Jupiter.local with PID 1481 (/Users/codecraft/workspace/redisdemo/target/classes started by codecraft in /Users/codecraft/workspace/redisdemo) 2016-02-16 00:14:08.193 INFO 1481 --- [ main] com.codecraft.RedisdemoApplication : No active profile set, falling back to default profiles: default 2016-02-16 00:14:08.242 INFO 1481 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@140e5a13: startup date [Tue Feb 16 00:14:08 CST 2016]; root of context hierarchy 2016-02-16 00:14:09.756 INFO 1481 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2016-02-16 00:14:09.763 INFO 1481 --- [ main] o.s.c.support.DefaultLifecycleProcessor : Starting beans in phase 0 2016-02-16 00:14:09.807 INFO 1481 --- [ main] o.s.c.support.DefaultLifecycleProcessor : Starting beans in phase 2147483647 2016-02-16 00:14:09.897 INFO 1481 --- [ main] com.codecraft.RedisdemoApplication : Started RedisdemoApplication in 2.215 seconds (JVM running for 2.589) Message received: "Message 1, pool-1-thread-1" Message received: "Message 2, pool-1-thread-1" Message received: "Message 3, pool-1-thread-1" Message received: "Message 4, pool-1-thread-1" Message received: "Message 5, pool-1-thread-1" Message received: "Message 6, pool-1-thread-1" Message received: "Message 7, pool-1-thread-1" Message received: "Message 8, pool-1-thread-1" Message received: "Message 9, pool-1-thread-1" Message received: "Message 10, pool-1-thread-1"
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