如何利用Redis作为Mybatis的二级缓存

mybatis-plus:
configuration:
  log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  cache-enabled: true   # 开启二级缓存
mapper-locations: classpath:*/mapper/*.xml

redis:
  host: 101.411.160.111
  database: 0
  port: 6311
  password: 1111111

@Configuration
public class RedisConfig {
   /**
    * 设置系列化方式、事务等配置
    */
   @Bean
   public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory)
  {
       RedisTemplate<String,Serializable> redisTemplate = new RedisTemplate<>();
​
       redisTemplate.setConnectionFactory(lettuceConnectionFactory);
       //设置key序列化方式string
       redisTemplate.setKeySerializer(new StringRedisSerializer());
       //设置value的序列化方式json
       redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
​
       redisTemplate.setHashKeySerializer(new StringRedisSerializer());
       redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
​
       redisTemplate.afterPropertiesSet();
​
       return redisTemplate;
  }
}

@Slf4j
public class MybatisRedisCache implements Cache {
   private static final String COMMON_CACHE_KEY = “mybatis”;
   // 读写锁
   private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock(true)
   private final RedisTemplate<String, Object> redisTemplate;
   private final String nameSpace;
​
   public MybatisRedisCache(String nameSpace) {
       if (nameSpace == null) {
           throw new IllegalArgumentException(“Cache instances require an ID”);
      }
       redisTemplate = SpringUtil.getBean(“redisTemplate”);
       this.nameSpace = nameSpace;
  }
   @Override
   public String getId() {
       return this.nameSpace;
  }
​
   private String getKeys() {
​
       return COMMON_CACHE_KEY + “::” + nameSpace + “::*”;
  }
​
   private String getKey(Object key) {
       return COMMON_CACHE_KEY + “::” + nameSpace + “::” + DigestUtils.md5Hex(String.valueOf(key));
  }
   @Override
   public void putObject(Object key, Object value) {
       redisTemplate.opsForValue().set(getKey(key), value, 10, TimeUnit.MINUTES);
  }
   @Override
   public Object getObject(Object key) {
       try {
           return redisTemplate.opsForValue().get(getKey(key));
      } catch (Exception e) {
           e.printStackTrace();
           log.error(“缓存出错 “);
      }
       return null;
  }
​
   @Override
   public Object removeObject(Object o) {
       Object n = redisTemplate.opsForValue().get(getKey(o));
       redisTemplate.delete(getKey(o));
       return n;
  }
​
   @Override
   public void clear() {
       Set<String> keys = redisTemplate.keys(getKeys());
       if (CollectionUtil.isNotEmpty(keys)) {
           assert keys != null;
           redisTemplate.delete(keys);
      }
  }
   @Override
   public int getSize() {
       Set<String> keys = redisTemplate.keys(getKeys());
       if (CollectionUtil.isNotEmpty(keys)) {
           assert keys != null;
           return keys.size();
      }
       return 0;
  }
   @Override
   public ReadWriteLock getReadWriteLock() {
       return this.readWriteLock;
  }
}

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