使用redis實現(xiàn)延遲通知功能(Redis過期鍵通知)

更新時間：2021年09月03日 16:32:55 作者：爪哇_克勞德

這篇文章主要介紹了使用redis實現(xiàn)延遲通知功能(Redis過期鍵通知)的相關知識，本文通過實例代碼圖文相結(jié)合給大家介紹的非常詳細，對大家的學習或工作具有一定的參考借鑒價值，需要的朋友參考下吧

Redis 過期監(jiān)聽場景

業(yè)務中有類似等待一定時間之后執(zhí)行某種行為的需求 , 比如 30 分鐘之后關閉訂單 . 網(wǎng)上有很多使用 Redis 過期監(jiān)聽的 Demo

redis配置

把notify-keyspace-events Ex 這一行的注釋打開

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項目demo工程

項目結(jié)構如下圖

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maven依賴

<?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">
    <parent>
        <artifactId>kim-redis</artifactId>
        <groupId>com.kim</groupId>
        <version>1.0.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>kim-redis-expiration-notice</artifactId>

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>

    </dependencies>
</project>

配置文件

server:
  port: 20103

spring:
  redis:
    #數(shù)據(jù)庫索引
    database: 0
    host: 127.0.0.1
    port: 6379
    password: 123456
    lettuce:
      pool:
        #最大連接數(shù)
        max-active: 8
        #最大阻塞等待時間(負數(shù)表示沒限制)
        max-wait: -1
        #最大空閑
        max-idle: 8
        #最小空閑
        min-idle: 0
    #連接超時時間
    timeout: 10000

啟動類

/**
 * @Project: kim-redis
 * @PackageName: com.kim.redis.expiration.notice
 * @FileName: NoticeApplication.java
 * @Description: The NoticeApplication is...
 * @Author: kimwu
 * @Time: 2020-12-19 14:01:56
 */
@SpringBootApplication
public class NoticeApplication {

    public static void main(String[] args) {
        SpringApplication.run(NoticeApplication.class, args);
    }

}

配置類

@Configuration
public class RedisTimeoutConfiguration {

    @Autowired
    private RedisConnectionFactory redisConnectionFactory;

    @Bean
    public RedisMessageListenerContainer redisMessageListenerContainer() {
        RedisMessageListenerContainer redisMessageListenerContainer = new RedisMessageListenerContainer();
        redisMessageListenerContainer.setConnectionFactory(redisConnectionFactory);
        return redisMessageListenerContainer;
    }

    @Bean
    public KeyExpiredListener keyExpiredListener() {
        return new KeyExpiredListener(this.redisMessageListenerContainer());
    }
}

監(jiān)聽類

@Slf4j
public class KeyExpiredListener extends KeyExpirationEventMessageListener {


    public KeyExpiredListener(RedisMessageListenerContainer listenerContainer) {
        super(listenerContainer);
    }

    @Override
    public void onMessage(Message message, byte[] pattern) {
        String channel = new String(message.getChannel(), StandardCharsets.UTF_8);
        //過期的key
        String key = new String(message.getBody(), StandardCharsets.UTF_8);
        log.info("redis key 過期：pattern={},channel={},key={}", new String(pattern), channel, key);
    }
}