package fastweb.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import javax.annotation.Resource;
import java.lang.reflect.Method;
import java.time.Duration;


@Configuration
@EnableCaching // 开启缓存支持
public class RedisConfig {

    @Resource
    private LettuceConnectionFactory lettuceConnectionFactory;

    /**
     * @return 自定义策略生成的key
     * @description 自定义的缓存key的生成策略 若想使用这个key
     * 只需要讲注解上keyGenerator的值设置为keyGenerator即可</br>
     */
    @Bean
    public KeyGenerator keyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... params) {
                StringBuffer sb = new StringBuffer();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : params) {
                    sb.append(obj.toString());
                }
                return sb.toString();
            }
        };
    }

    /**
     * RedisTemplate配置
     */
    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        // 设置序列化
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        // 配置redisTemplate
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);
        RedisSerializer<?> stringSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringSerializer);// key序列化
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);// value序列化
        redisTemplate.setHashKeySerializer(stringSerializer);// Hash key序列化
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);// Hash value序列化
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    /**
     * 缓存配置管理器
     */
    @Bean
    public CacheManager cacheManager(LettuceConnectionFactory factory) {
        // 以锁写入的方式创建RedisCacheWriter对象
        RedisCacheWriter writer = RedisCacheWriter.lockingRedisCacheWriter(factory);
        /**
         * 设置CacheManager的Value序列化方式为JdkSerializationRedisSerializer,
         * 但其实RedisCacheConfiguration默认就是使用 StringRedisSerializer序列化key，
         * JdkSerializationRedisSerializer序列化value, 所以以下注释代码就是默认实现，没必要写，直接注释掉
         */
        // RedisSerializationContext.SerializationPair pair =
        // RedisSerializationContext.SerializationPair.fromSerializer(new
        // JdkSerializationRedisSerializer(this.getClass().getClassLoader()));
        // RedisCacheConfiguration config =
        // RedisCacheConfiguration.defaultCacheConfig().serializeValuesWith(pair);
        // 创建默认缓存配置对象
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofHours(1)); // 设置缓存有效期一小时;
        RedisCacheManager cacheManager = new RedisCacheManager(writer, config);
        return cacheManager;
    }


}
