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Redis发布订阅PUB/SUB是一种消息通信模式，发送者PUB发送消息，订阅者SUB接收消息。Redis客户端可以订阅任意数量的频道，一个通道CHANNEL可以被多个客户端订阅，当一条消息发送到CHANNEL中去后所有订阅的客户端都会接收到此消息。
一、Redis客户端命令
- 订阅一个或多个频道
SUBSCRIBE channel[channel ...]
- 取消客户端对一个或多个频道的订阅
UNSUBSCRIBE [channel [channel ...]]
- 订阅一个或多个符合给定模式的频道
PSUBSCRIBE pattern [pattern ...]
- 取消一个或多个符合给定模式的频道的订阅
PUNSUBSCRIBE [pattern [pattern ...]]
- 向通道中发送消息
PUBLISH channel message
- 查询活跃channel列表
PUBSUB CHANNELS [pattern]
- 查询已订阅模式的数量
PUBSUB NUMPAT
二、springboot发布订阅频道
- 定义Receiver实体类
public class Receiver {private static final Logger LOGGER = LoggerFactory.getLogger(Receiver.class);private AtomicInteger counter = new AtomicInteger();public void receiveMessage(String message) {LOGGER.info("Received <" + message + ">");counter.incrementAndGet();}public int getCount() {return counter.get();}
}
- 定义订阅消息通道配置类
@Configuration
public class RedisConfig {@Beanpublic String register(RedisMessageListenerContainer factory, MessageListenerAdapter messageListenerAdapter) {factory.addMessageListener(messageListenerAdapter, PatternTopic.of("test"));factory.addMessageListener(messageListenerAdapter, ChannelTopic.of("test1"));return "success";}@Beanpublic String register1(@Qualifier("test1RedisMessageListenerContainer") RedisMessageListenerContainer factory, MessageListenerAdapter messageListenerAdapter) {factory.addMessageListener(messageListenerAdapter, PatternTopic.of("test"));factory.addMessageListener(messageListenerAdapter, PatternTopic.of("test1"));return "success";}@Beanpublic MessageListenerAdapter messageListenerAdapter() {return new MessageListenerAdapter(new Receiver(), "receiveMessage");}
}
上述是基于自定义redis sdk，支持多个RedisMessageListenerContainer
- 向频道中发送消息
@GetMapping("send")public void send() {RedisDbFactory.getStringRedisTemplate().convertAndSend("test", "测试消息");RedisDbFactory.getStringRedisTemplate("test1").convertAndSend("test1", "测试消息1");}
开源SDK：https://github.com/mingyang66/spring-parent