[GitHub] [dubbo-spi-extensions] gcdd1993 opened a new issue #78: Kryo序列化协议，希望能加入自定义注册类的ClassId的支持

[GitBox <gi...@apache.org>]

gcdd1993 opened a new issue #78:
URL: https://github.com/apache/dubbo-spi-extensions/issues/78


   - [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
   - [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
   
   ### Environment
   
   * Dubbo version: 2.7.8
   * Operating System version: Win10
   * Java version: Jdk11
   
   ### 场景描述
   在多模块协作的系统中，无法保证服务提供方和消费方Java DTO数量以及注册顺序的一致，可能A作为服务提供方，提供了DTO，而B作为消费方，可能同时消费A、C的服务，同时自身也对外提供服务，在使用Kryo序列化时，需要同时注册A、B、C服务的DTO。
   
   例如A系统的SerializationOptimizer实现
   
   ```java
   public class ASerializationOptimizerImpl
           implements SerializationOptimizer {
       @Override
       public Collection<Class<?>> getSerializableClasses() {
           return A1.class;
           return A2.class;
           return A3.class;
           return A4.class;
           return C1.class;
           return C2.class;
       }
   }
   ```
   
   B系统的SerializationOptimizer实现
   
   ```java
   public class BSerializationOptimizerImpl
           implements SerializationOptimizer {
       @Override
       public Collection<Class<?>> getSerializableClasses() {
           return A1.class;
           return A2.class;
           return A3.class;
           return A4.class;
           return B1.class;
           return B2.class;
           return C1.class;
           return C2.class;
       }
   }
   ```
   
   目前Dubbo使用的主要是Kryo的
   ```java
   public Registration register (Class type) {
   	Registration registration = classResolver.getRegistration(type);
   	if (registration != null) return registration;
   	return register(type, getDefaultSerializer(type));
   }
   ```
   该方法的实现，要求**反序列化时的顺序必须与序列化时的顺序相同**。
   在多模块系统下很难达成此条件。
   
   希望能加入对`com.esotericsoftware.kryo.Kryo#register (Class type, int id)`的支持，自定义ClassId
   ```java
   public Registration register (Class type, int id) {
   	Registration registration = classResolver.getRegistration(type);
   	if (registration != null) return registration;
   	return register(type, getDefaultSerializer(type), id);
   }
   ```
   
   
   


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