Redis实现订单自动过期功能的示例代码 - 主机乐

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;@Configurationpublic 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; }@BeanMessageListenerAdapter 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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