一个高性能的序列化实现

需要的环境：jdk8、redis
使用场景：redis缓存优化，秒杀场景，比java本身提供的序列化性能更优

依赖的jar包：

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-data-redisartifactId>
		dependency>
		<dependency>
			<groupId>redis.clientsgroupId>
			<artifactId>jedisartifactId>
			<version>2.9.0version>
		dependency>
		
		
		<dependency>
			<groupId>com.dyuproject.protostuffgroupId>
			<artifactId>protostuff-coreartifactId>
			<version>1.0.8version>
		dependency>
		<dependency>
			<groupId>com.dyuproject.protostuffgroupId>
			<artifactId>protostuff-runtimeartifactId>
			<version>1.0.8version>
		dependency>

上代码：

import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.runtime.RuntimeSchema;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import java.util.HashMap;

/**
 * Created by xpc on 2018/12/19.
 * redis后端缓存优化编码
 */
public class DictDaoImpl{
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private final JedisPool jedisPool;
    //存放序列化对象
    private RuntimeSchema<Dict> schema  = RuntimeSchema.createFrom(Dict.class);

    public DictDaoImpl(String ip, int port){
        jedisPool = new JedisPool(ip,port);
    }

    //把字符串中的内容读取为字典数组对象
    public Dict load(String dictId){
        //redis操作逻辑
        try{
            Jedis jedis  = jedisPool.getResource();
            try{
                String key = "seckill:"+dictId;
                //并没有实现内部序列化操作
                // get -> byte[] -> 反序列化 -> Object(Dict)
                //采用自定义序列化，转换为二进制，需要protostuff的序列化依赖包
                //protostuff:pojo.
                byte[] bytes = jedis.get(key.getBytes());
                //缓存中获取到
                if(bytes != null){
                    //空对象
                    Dict seckill = schema.newMessage();
                    ProtostuffIOUtil.mergeFrom(bytes,seckill,schema);
                    //seckill 被反序列化
                    return  seckill;
                }
            }finally {
                jedis.close();
            }
        }catch (Exception e){
            logger.error(e.getMessage(),e);
        }
        return null;
    }

    //把数组保存到一个Dict对象中
    public  String store(Dict dict){
        //set Object(Dict) -> 序列化 -> byte[]
        try{
            Jedis jedis = jedisPool.getResource();
            try{
                String key = "seckill:"+dict.getKey();
                byte[] bytes = ProtostuffIOUtil.toByteArray(dict,schema, LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE));
                //超时缓存
                int timeout = 60 * 60 ;//1小时
                String result = jedis.setex(key.getBytes(),timeout,bytes);
                return result;
            }finally {
                jedis.close();
            }
        }catch (Exception e){
            logger.error(e.getMessage(),e);
        }
        return null;
    }


    static class Dict {
        private String key;
        private HashMap<String,String> map;

        public Dict(String key, HashMap<String, String> map) {
            this.key = key;
            this.map = map;
        }
        public String getKey() {
            return key;
        }
        public void setKey(String key) {
            this.key = key;
        }
        public HashMap<String, String> getMap() {
            return map;
        }
        public void setMap(HashMap<String, String> map) {
            this.map = map;
        }

        @Override
        public String toString() {
            return "Dict{" +
                    "key=" + key +
                    ", map=" + map +
                    '}';
        }
    }

    public static void main(String [] args){
        DictDaoImpl dictDaoImpl = new DictDaoImpl("localhost",6379);

        for (int i = 0; i < 5; i++) {
            String key = "k" + i;
            for (int j = 0; j < 10; j++) {
                String val = "v" + j;
                String tmpKey = "k" + j;
                HashMap<String,String> map = new HashMap<>();
                map.put(tmpKey,val);
                Dict dict = dictDaoImpl.load(val);
                if(dict == null){
                    dict = new Dict(key,map);
                    if(dict != null){
                        String result = dictDaoImpl.store(dict);
//                        System.out.println(result);
                        dict = dictDaoImpl.load(key);
                        System.out.println(dict.toString());
                    }
                }
            }
        }
    }

}