Redis - 多数据源切换

问题描述

最近遇到一个 Redis 多数据源切换问题，不过我这个没有那么动态切换需求，所以就写了一种比较硬编码的方式来做『切换』

其实大概的场景是这样的：不同的开发环境调用 db0、生产环境调用 db1，但是因为业务原因，当中有一部分的业务需要共享数据（中心数据），所以想把 db15 当作他们的共享数据库。

原因分析

思路很简单，只要生产 2 个 RedisTemplate 即可：

1. 调用默认的 db RedisTemplate
2. 调用共享的 db RedisTemplate

解决方案

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisClientConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericToStringSerializer;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import javax.annotation.Resource;
import java.time.Duration;

/**
 * @author Lux Sun
 * @date 2020/5/9
 */
@Slf4j
@Configuration
public class RedisConfig {

    @Resource
    private JedisConnectionFactory jedisConnectionFactory;

    @Bean
    public RedisTemplate<String, Object> comnRedisObjectTemplate(@Value("${spring.redis.host}") String host,
                                                                 @Value("${spring.redis.port}") int port) {
        RedisStandaloneConfiguration redisConfig = new RedisStandaloneConfiguration();
        redisConfig.setHostName(host);
        redisConfig.setPort(port);
        // 指定 database 15
        redisConfig.setDatabase(15);
        GenericObjectPoolConfig config = new GenericObjectPoolConfig();
        JedisClientConfiguration clientConfiguration = JedisClientConfiguration.builder().usePooling().build();
        JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory(redisConfig, clientConfiguration);
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(jedisConnectionFactory);
        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);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(serializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(serializer);
        template.afterPropertiesSet();
        return template;
    }

    @Bean
    public RedisTemplate<String, Object> redisObjectTemplate() {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(jedisConnectionFactory);
        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);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(serializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(serializer);
        template.afterPropertiesSet();
        return template;
    }
}