Redis如何实现订单自动过期功能的示例代码

前言

用户下单后，规定XX分钟后自动设置为“已过期”，不能再发起支付。项目类似此类"过期"的需求，笔者提供一种使用Redis的解决思路，结合Redis的订阅、发布和键空间通知机制（Keyspace Notifications）进行实现。

配置redis.confg

notify-keyspace-events选项默认是不启用，改为notify-keyspace-events “Ex”。重启生效，索引位i的库，每当有过期的元素被删除时，向**keyspace@:expired**频道发送通知。 E表示键事件通知，所有通知以__keyevent@__:expired为前缀； x表示过期事件，每当有过期被删除时发送。

与SpringBoot进行集成

①注册JedisConnectionFactory

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisPassword;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;

import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

@Configuration
public class RedisConfig {
 
 @Value("${redis.pool.maxTotal}")
 private Integer maxTotal;
 
 @Value("${redis.pool.minIdle}")
 private Integer minIdle;
 
 @Value("${redis.pool.maxIdle}")
 private Integer maxIdle;
 
 @Value("${redis.pool.maxWaitMillis}")
 private Integer maxWaitMillis;
 
 @Value("${redis.url}")
 private String redisUrl;
 
 @Value("${redis.port}")
 private Integer redisPort;
 
 @Value("${redis.timeout}")
 private Integer redisTimeout;
 
 @Value("${redis.password}")
 private String redisPassword;
 
 @Value("${redis.db.payment}")
 private Integer paymentDataBase;
 
 private JedisPoolConfig jedisPoolConfig() {
  JedisPoolConfig config = new JedisPoolConfig();
  config.setMaxTotal(maxTotal);
  config.setMinIdle(minIdle);
  config.setMaxIdle(maxIdle);
  config.setMaxWaitMillis(maxWaitMillis);
  return config;
 }
 
 @Bean
 public JedisPool jedisPool() {
  JedisPoolConfig config = this.jedisPoolConfig();
  JedisPool jedisPool = new JedisPool(config, redisUrl, redisPort, redisTimeout, redisPassword);
  return jedisPool;
 }
 
 @Bean(name = "jedisConnectionFactory")
 public JedisConnectionFactory jedisConnectionFactory() {
  RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration();
  redisStandaloneConfiguration.setDatabase(paymentDataBase);
  redisStandaloneConfiguration.setHostName(redisUrl);
  redisStandaloneConfiguration.setPassword(RedisPassword.of(redisPassword));
  redisStandaloneConfiguration.setPort(redisPort);

  return new JedisConnectionFactory(redisStandaloneConfiguration);
 }
}

②注册监听器

import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service(value ="paymentListener")
public class PaymentListener implements MessageListener {

 @Override
 @Transactional
 public void onMessage(Message message, byte[] pattern) {
  // 过期事件处理流程
 }
}

③配置订阅对象

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;

@Configuration
@AutoConfigureAfter(value = RedisConfig.class)
public class PaymentListenerConfig {
 
 @Autowired
 @Qualifier(value = "paymentListener")
 private PaymentListener paymentListener;
 
 @Autowired
 @Qualifier(value = "paymentListener")
 private JedisConnectionFactory connectionFactory;
 
 @Value("${redis.db.payment}")
 private Integer paymentDataBase;
 
 @Bean
 RedisMessageListenerContainer redisMessageListenerContainer(MessageListenerAdapter listenerAdapter) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        // 监听paymentDataBase 库的过期事件
        String subscribeChannel = "__keyevent@" + paymentDataBase + "__:expired";
        container.addMessageListener(listenerAdapter, new PatternTopic(subscribeChannel));
        return container;
 }
 
 @Bean
    MessageListenerAdapter listenerAdapter() {
        return new MessageListenerAdapter(paymentListener);
    }
}

paymentDataBase 库元素过期后就会跳入PaymentListener 的onMessage(Message message, byte[] pattern)方法。

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