theweipeng opened a new pull request, #1797:
URL: https://github.com/apache/fury/pull/1797
## What does this PR do?
### Support serialization and deserialization of trait objects
The relationship between a trait object and a concrete type is generated by
a macro and stored in a Fury instance. We can access the serializer and
deserializer using the `Fury type ID` and `Rust type ID`.
Use as follows
```Rust
#[impl_polymorph]
trait Animal {
fn get_name(&self) -> String;
}
#[derive(Fury, Debug)]
#[polymorphic_traits("Animal")]
struct Dog {
name: String
}
impl Animal for Dog {
fn get_name(&self) -> String {
self.name.clone()
}
}
#[derive(Fury)]
struct Person {
pet: Box<dyn Animal>
}
let p = Person {
pet: Box::new(Dog {
name: String::from("puppy")
})
};
let mut fury = Fury::default();
fury.register::<Person>(501);
fury.register::<Dog>(500);
let bin = fury.serialize(&p);
let obj: Person = fury.deserialize(&bin).unwrap();
assert_eq!(obj.pet.get_name(), "puppy");
```
We should add `impl_polymorph` for trait which is use for serializing
`Box<dyn xxxx>` and `polymorphic_traits` for struct which is use for generate
code to cast upcast concete type to trait object. Note that rust not support
upcast trait yet(https://github.com/rust-lang/rust/issues/65991).
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