Redis 캐시 만료 모니터링

Redis 캐시 만료는 Redis 구독 및 게시 기능 (pub / sub)을 통해 배포되므로 redis 이벤트 모니터링 및 게시를 활성화해야합니다.
redis 구성 파일을
수정 합니다. notify-keyspace-events ""를 notify-keyspace-events "Ex"로 수정하여
다시 시작합니다. Redis는
두 개의 클라이언트를 열어 구성이 적용되는지 테스트합니다.
클라이언트 1은 만료 시간을 모니터링합니다.

SUBSCRIBE __keyevent@0__:expired

클라이언트 2는 만료 시간이 1 초인 키를 설정합니다.

set ex_key ex_value ex 1  

클라이언트 1이 만료 된 이벤트를 성공적으로 모니터링했습니다.

자바 모니터

pom 파일

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.sunyuqi</groupId>
    <artifactId>redis_demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.3.RELEASE</version>
        <relativePath/> 
    </parent>
    <properties>
        <java.version>9</java.version>
    </properties>
    <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-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

구성 클래스

package com.sunyuqi.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
@Profile("pubsub")
class RedisTemplateConfig {
    
    

    @Bean
    public LettuceConnectionFactory redisConnectionFactory() {
    
    
        return new LettuceConnectionFactory(new RedisStandaloneConfiguration("127.0.0.1", 6379));
    }

    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
    
    
        RedisTemplate redisTemplate = new RedisTemplate();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        // 可以配置对象的转换规则，比如使用json格式对object进行存储。
        // Object --> 序列化 --> 二进制流 --> redis-server存储
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
        return redisTemplate;
    }
}

만료 된 메시지 리스너 클래스 캐시

package com.sunyuqi.pubsub;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.listener.ChannelTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.stereotype.Component;

import java.util.Arrays;

@Component
@Profile("pubsub")
@Configuration
public class ExListener {
    
    
    // 定义监听器
    @Bean
    public RedisMessageListenerContainer smsMessageListener(RedisConnectionFactory redisConnectionFactory) {
    
    
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(redisConnectionFactory);
        SmsSendListener smsSendListener = new SmsSendListener();
        container.addMessageListener(smsSendListener, Arrays.asList(new ChannelTopic("__keyevent@0__:expired")));
        return container;
    }

    class SmsSendListener implements MessageListener {
    
    
        @Override
        public void onMessage(Message message, byte[] pattern) {
    
    
            System.out.println("key: " + message + "已过期。");
        }
    }
}

테스트 클래스

package com.sunyuqi.pubsub;

import com.sunyuqi.SpringbootApplicationDemo;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.concurrent.TimeUnit;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootApplicationDemo.class)
@ActiveProfiles("pubsub")
public class PubsubTest {
    
    

    @Autowired
    RedisTemplate redisTemplate;

    @Test
    public void test() throws InterruptedException {
    
    
        //设置一秒钟过期
        redisTemplate.opsForValue().set("ex_test","test",1,TimeUnit.SECONDS);
        Thread.sleep(2000);
    }
}

캐시 만료를 성공적으로 모니터링했습니다.