Redis配置Kryo序列化和Snappy压缩

前言

redis自带的StringSerializer性能相对较差，redis官方推荐kryo来提高序列化和反序列化速度，推荐snappy来节约redis内存和网络带宽，在springboot中可以通过配置快速实现这个功能

maven配置

 
            com.esotericsoftware
            kryo
            5.3.0
 
 
            org.xerial.snappy
            snappy-java
            1.1.8.4
 

配置KryoRedisSerializer

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.io.ByteArrayOutputStream;

/**
 * @author 后厂村老司机
 */
@Slf4j
public class KryoRedisSerializer implements RedisSerializer {

    public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];

    private static final ThreadLocal KYROS = ThreadLocal.withInitial(Kryo::new);

    private Class clazz;

    public KryoRedisSerializer(Class clazz) {
        super();
        this.clazz = clazz;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException {
        if (t == null) {
            return EMPTY_BYTE_ARRAY;
        }

        Kryo kryo = KYROS.get();
        kryo.setReferences(false);
        kryo.register(clazz);

        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
             Output output = new Output(baos)) {
            kryo.writeClassAndObject(output, t);
            output.flush();
            return baos.toByteArray();
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }

        return EMPTY_BYTE_ARRAY;
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length <= 0) {
            return null;
        }

        Kryo kryo = KYROS.get();
        kryo.setReferences(false);
        kryo.register(clazz);
        try (Input input = new Input(bytes)) {
            return (T) kryo.readClassAndObject(input);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }

        return null;
    }
}

配置Snappy

import org.apache.commons.lang3.SerializationUtils;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;
import org.xerial.snappy.Snappy;

import java.io.Serializable;

/ ** @author 后厂村老司机*/
public class SnappyRedisSerializer implements RedisSerializer {

    private RedisSerializer innerSerializer;

    public SnappyRedisSerializer() {

    }

    public SnappyRedisSerializer(RedisSerializer innerSerializer) {
        this.innerSerializer = innerSerializer;
    }

    /**
     * Create a byte array by serialising and Compressing a java graph (object)
     */
    @Override
    public byte[] serialize(T object) throws SerializationException {
        try {
            byte[] bytes = innerSerializer != null ? innerSerializer.serialize(object)
                    : SerializationUtils.serialize((Serializable) object);
            return Snappy.compress(bytes);
        } catch (Exception e) {
            throw new SerializationException(e.getMessage(), e);
        }
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        try {
            if (bytes == null || bytes.length <= 0) {
                return null;
            }
            byte[] bos = Snappy.uncompress(bytes);
            return (T) (innerSerializer != null ?
                    innerSerializer.deserialize(bos) : SerializationUtils.deserialize(bos));
        } catch (Exception e) {
            throw new SerializationException(e.getMessage(), e);
        }
    }
}

配置redis

public StringRedisTemplate createStringRedisTemplate(RedisConnectionFactory redisConnectionFactory) {
        StringRedisTemplate redisTemplate = new StringRedisTemplate();
        redisTemplate.setConnectionFactory(redisConnectionFactory);

        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        redisTemplate.setValueSerializer(new SnappyRedisSerializer<>(new KryoRedisSerializer<>(Object.class)));
        redisTemplate.setKeySerializer(stringRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }