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Redis實(shí)現(xiàn)訂單自動過期功能的示例代碼

更新時間：2021年05月08日 11:51:40 作者：SvenJoe

這篇文章主要介紹了Redis實(shí)現(xiàn)訂單自動過期功能的示例代碼，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

前言

用戶下單后，規(guī)定XX分鐘后自動設(shè)置為“已過期”，不能再發(fā)起支付。項(xiàng)目類似此類"過期"的需求，筆者提供一種使用Redis的解決思路，結(jié)合Redis的訂閱、發(fā)布和鍵空間通知機(jī)制（Keyspace Notifications）進(jìn)行實(shí)現(xiàn)。

配置redis.confg

notify-keyspace-events選項(xiàng)默認(rèn)是不啟用，改為notify-keyspace-events “Ex”。重啟生效，索引位i的庫，每當(dāng)有過期的元素被刪除時，向**keyspace@:expired**頻道發(fā)送通知。
E表示鍵事件通知，所有通知以__keyevent@__:expired為前綴；
x表示過期事件，每當(dāng)有過期被刪除時發(fā)送。

與SpringBoot進(jìn)行集成

①注冊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注冊監(jiān)聽器

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) {
  // 過期事件處理流程
 }
}

③配置訂閱對象

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);
        // 監(jiān)聽paymentDataBase 庫的過期事件
        String subscribeChannel = "__keyevent@" + paymentDataBase + "__:expired";
        container.addMessageListener(listenerAdapter, new PatternTopic(subscribeChannel));
        return container;
 }
 
 @Bean
    MessageListenerAdapter listenerAdapter() {
        return new MessageListenerAdapter(paymentListener);
    }
}

paymentDataBase 庫元素過期后就會跳入PaymentListener 的onMessage(Message message, byte[] pattern)方法。

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