redis消息队列——发布订阅

一、相关依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

二、redis 监听器配置

import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;


@Configuration
@EnableCaching
public class RedisConfig{
    /**
     * Redis消息监听器容器
     * @param connectionFactory
     * @return
     */
    @Bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {

        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        //订阅了一个叫pmp和channel 的通道，多通道
        container.addMessageListener(listenerAdapter(new RedisPmpSub()),new PatternTopic("pmp"));
        container.addMessageListener(listenerAdapter(new RedisChannelSub()),new PatternTopic("channel"));
        //这个container 可以添加多个 messageListener
        return container;
    }

    /**
     * 配置消息接收处理类
     * @param redisMsg  自定义消息接收类
     * @return
     */
    @Bean()
    @Scope("prototype")
    MessageListenerAdapter listenerAdapter(RedisMsg redisMsg) {
        //这个地方 是给messageListenerAdapter 传入一个消息接受的处理器，利用反射的方法调用“receiveMessage”
        //也有好几个重载方法，这边默认调用处理器的方法 叫handleMessage 可以自己到源码里面看
        return new MessageListenerAdapter(redisMsg, "receiveMessage");//注意2个通道调用的方法都要为receiveMessage
    }

}

三、消息处理器

import org.springframework.stereotype.Component;


@Component
public interface RedisMsg {

    public void receiveMessage(String message);
}


public class RedisPmpSub implements RedisMsg{

    /**
     * 接收消息的方法
     * @param message 订阅消息
     */
    public void receiveMessage(String message){
        //注意通道调用的方法名要和RedisConfig2的listenerAdapter的MessageListenerAdapter参数2相同
        System.out.println(message);
    }
}

四、消息发布者

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

//定时器
@EnableScheduling
@Component
public class TestSenderController {
    @Autowired
        private StringRedisTemplate stringRedisTemplate;

    //向redis消息队列index通道发布消息
    @Scheduled(fixedRate = 2000)
    public void sendMessage(){
        stringRedisTemplate.convertAndSend("pmp",String.valueOf(Math.random()));
        stringRedisTemplate.convertAndSend("channel",String.valueOf(Math.random()));
    }
}

备注: 使用策略模式优化消息处理器，模板化建立通道

参考链接 https://www.cnblogs.com/IT-study/p/11352254.html