文章背景
我们的目的是在用户下单后，规定指定时间后自动将订单设置为“已过期”，不能再发起支付。
（学习视频分享：redis视频教程）
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。
相关推荐：redis视频教程
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