import java.lang.reflect.Method;

import org.springframework.cache.CacheManager;

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.RedisCacheManager;

import org.springframework.data.redis.connection.RedisConnectionFactory;

import org.springframework.data.redis.core.RedisTemplate;

import org.springframework.data.redis.core.StringRedisTemplate;

import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import org.springframework.data.redis.serializer.StringRedisSerializer;

import com.fasterxml.jackson.annotation.JsonAutoDetect;

import com.fasterxml.jackson.annotation.PropertyAccessor;

import com.fasterxml.jackson.databind.ObjectMapper;

@Configuration

@EnableCaching

public class RedisConfig {

    /**

     * 自定义缓存数据 key 生成策略

     */

    @Bean

    public KeyGenerator keyGenerator() {

        return new KeyGenerator() {

            @Override

            public Object generate(Object target, Method method, Object... params) {

                StringBuilder sb = new StringBuilder();

                sb.append(target.getClass().getName());

                sb.append(method.getName());

                for (Object obj : params) {

                    sb.append(obj.toString());

                }

                return sb.toString();

            }

        };

    }

    /**

     * RedisTemplate配置

     * 

     * JdkSerializationRedisSerializer：使用JDK的序列化手段(serializable接口，ObjectInputStrean，

     * ObjectOutputStream)，数据以字节流存储 StringRedisSerializer：字符串编码，数据以string存储

     * JacksonJsonRedisSerializer：json格式存储 OxmSerializer：xml格式存储 GenericToStringSerializer

     * 

     * @return

     */

    @Bean

    public StringRedisTemplate template(RedisConnectionFactory factory) {

        Jackson2JsonRedisSerializer<Object> serializer = new Jackson2JsonRedisSerializer<>(Object.class);

        ObjectMapper om = new ObjectMapper();

        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);

        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

        serializer.setObjectMapper(om);

        StringRedisTemplate template = new StringRedisTemplate(factory);

        template.setKeySerializer(new StringRedisSerializer()); // 对于普通K-V操作时，key采取的序列化策略

        template.setValueSerializer(serializer); // value采取的序列化策略

        template.setHashKeySerializer(serializer); // 在hash数据结构中，hash-key的序列化策略

        template.setHashValueSerializer(serializer); // 在hash数据结构中，hash-key的序列化策略

        template.afterPropertiesSet();

        return template;

    }

    /**

     * 设置缓存对象的序列化方式 另外对于json序列化,对象要提供默认空构造器

     * 

     * @param redisTemplate

     * @return

     */

    @SuppressWarnings("unchecked")

    @Bean

    public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {

        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);

        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);

        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);

        // defaultExpireTime time in seconds.

        cacheManager.setDefaultExpiration(300);

        return cacheManager;

    }

}