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redis的發(fā)布訂閱功能是什么?針對(duì)這個(gè)問題,這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答,希望可以幫助更多想解決這個(gè)問題的小伙伴找到更簡(jiǎn)單易行的方法。
序
redis提供了簡(jiǎn)單的發(fā)布訂閱功能,對(duì)于一些合適的場(chǎng)景(比如不要求消費(fèi)者不在線時(shí)也能收到離線消息),比起專業(yè)的MQ來(lái)說,用起來(lái)更簡(jiǎn)單些。本文主要是記錄下怎么在SpringBoot里頭使用redis的發(fā)布訂閱功能。
定義生產(chǎn)者
配置
@Bean MyPublisher redisPublisher(RedisConnectionFactory factory) { return new MyPublisher( redisTemplate(factory), topic() ); } @Bean ChannelTopic topic() { return new ChannelTopic( "pubsub:queue" ); }
生產(chǎn)者實(shí)例
public class MyPublisher { private final RedisTemplate< String, Object > template; private final ChannelTopic topic; private final AtomicLong counter = new AtomicLong( 0 ); public MyPublisher( final RedisTemplate< String, Object > 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() ); } }
定義消費(fèi)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; }
消費(fèi)者實(shí)例
public class MyMessageListener implements MessageListener { @Override public void onMessage( final Message message, final byte[] pattern ) { System.out.println( "Message received: " + message.toString() ); } }
運(yùn)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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