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
  @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;
   }
}

Cache Hit Ratio [com.yitiao.mapper.ArticleMapper]: 0.5