package com.qn.config.redisConfig;

import com.alibaba.druid.support.json.JSONUtils;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCacheWriter;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.io.Serializable;
import java.time.Duration;

@SpringBootConfiguration
@EnableCaching//开启缓存
public class LettuceRedisConfig {

    /**
     * redisTemplate配置
     * @param connectionFactory
     * @return
     */
    @Bean
    public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory) {
        /*Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        //解决查询缓存转换异常的问题
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance,ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);*/
        RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(connectionFactory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    /**
     * reis缓存配置
     * @param redisTemplate
     * @returnd
     */
    @Bean
    public RedisCacheManager cacheManager(RedisTemplate redisTemplate) {
        RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisTemplate.getConnectionFactory());
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(redisTemplate.getValueSerializer()))
                .disableCachingNullValues()
                // 缓存数据保存1小时
                .entryTtl(Duration.ofHours(1));
        return new RedisCacheManager(redisCacheWriter, redisCacheConfiguration);
    }

    /**
     * 缓存key自定义
     * @return
     */
    @Bean
    public KeyGenerator cacheKeyGenerator() {
        return (target, method, params) -> {
        StringBuilder sb = new StringBuilder();
        sb.append(target.getClass().getName());
        sb.append(method.getName());
        for (Object obj : params) {
            // 由于参数可能不同, hashCode肯定不一样, 缓存的key也需要不一样
            sb.append(JSONUtils.toJSONString(obj).hashCode());
        }
            return sb.toString();
    };
    }
}

package com.qn.service;

import com.qn.eneity.User;
import com.qn.dao.boot.UserMapperAnocation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import java.util.Date;
import java.util.List;

/**
 * 注解使用mybatis业务类
 */
@Service
public class UserServiceAnocation {
    @Autowired
    UserMapperAnocation userMapperAnocation;

    @Cacheable(value = "user", key = "#id",unless="#result == null||#result.size()<1")
    public List<User> getUserById(Integer id) {
        System.out.println(new Date().toString());
        return userMapperAnocation.getUserById(id);
    }

    @Cacheable(value = "user", keyGenerator = "cacheKeyGenerator",unless="#result == null||#result.size()<1")
    public List<User> getAllUser() {
        System.out.println(new Date().toString());
        return userMapperAnocation.getAllUsers();
    }
}