Hi again,

I have two classes where B extends from A. Since both classes are
legacy and as far as I understood protocol buffers I write a proto
file for class A. For serialization and deserialization I just add the
methods writeObject() and readObject() to class A.

Now I wonder how to write the proto file for class B which is a
subclass of A? Is it like this that I define in the B proto file the
attributes defined in B and then in Class B's methods I do this:

    private void writeObject(java.io.ObjectOutputStream out) throws
IOException {
        Builder builder = A.AttributeA.newBuilder();
        A.AttributeA message = builder.build();

        Builder builder2 = B.AttributeB.newBuilder();
        B.AttributeB message2 = builder2.build();

    private void readObject(java.io.ObjectInputStream in)
            throws ClassNotFoundException, IOException {
        A.AttributeA message = A.AttributeA.parseFrom(in);
        attributeA = message.getAttributeA();

        B.AttributeB message2 = B.AttributeB.parseFrom(in);
        attributeB = message2.getAttributeB();

Is this the standard approach?

Thanks Tai
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