Protostuff 运行时模式和多态性问题

Question

我在 Java 中有一个类的层次结构，我想使用 protostuff 对其进行序列化和反序列化。

类如下（只是一个玩具示例）

class Wrapper {
    public List<Being> beings;
}

class Being {
    public Animal animal;
}

class Animal {
    public String sex;
    public int legs;
}

class Antelope extends Animal {
    public int speed;
    public String furType;
}

class Spider extends Animal {
    public int numberOfEyes;
    public int size;
}

我使用以下代码使用运行时模式生成对对象进行序列化和反序列化，如下所示

public static void main(String[] args) {
    LinkedBuffer buffer = LinkedBuffer.allocate(1024 * 1024);

    Being b1 = new Being();
    Antelope a1 = new Antelope();
    a1.legs = 4;
    a1.furType = "Fuzzy";
    a1.sex = "M";
    a1.speed = 70;
    b1.animal = a1;

    Being b2 = new Being();
    Spider s1 = new Spider();
    s1.legs = 4;
    s1.sex = "M";
    s1.numberOfEyes = 8;
    s1.size = 2;
    b2.animal = s1;

    Wrapper w = new Wrapper();
    w.beings = new ArrayList<>();
    w.beings.add(b1);
    w.beings.add(b2);

    // Serialize
    Schema<Wrapper> schema = RuntimeSchema.getSchema(Wrapper.class);
    byte[] data = ProtostuffIOUtil.toByteArray(w, schema, buffer);

    // Deserialize
    Wrapper w1 = schema.newMessage();
    ProtostuffIOUtil.mergeFrom(data, w1, schema);

    System.out.println(w1.beings.get(0).animal.getClass());
    System.out.println(w1.beings.get(1).animal.getClass());
}

问题是这段代码的输出是

class Animal
class Animal

而不是

class Antelope
class Spider

如何在 serialization/deserialization 期间保留多态性信息？

希望有人能帮助我

Answer 1

按照相关测试中的描述尝试启用系统属性：

https://github.com/protostuff/protostuff/blob/master/protostuff-runtime/src/test/java/io/protostuff/runtime/InheritanceTest.java

Protostuff 运行时模式和多态性问题

Protostuff runtime schema and polymorphism issues

java

polymorphism

serialization

deserialization

protostuff