Trait AnyAsyncEngine

Source

pub trait AnyAsyncEngine: Send + Sync {
    // Required methods
    fn request_type_id(&self) -> TypeId;
    fn response_type_id(&self) -> TypeId;
    fn error_type_id(&self) -> TypeId;
    fn as_any(&self) -> &dyn Any;
}

Expand description

A type-erased AsyncEngine.

This trait enables storing heterogeneous AsyncEngine implementations in collections by erasing their specific generic type parameters. It provides runtime type information and safe downcasting capabilities.

§Type Erasure Mechanism

The trait uses std::any::TypeId to preserve type information at runtime, allowing safe downcasting back to the original AsyncEngine<Req, Resp, E> types.

§Safety Guarantees

Type IDs are preserved exactly as they were during type erasure
Downcasting is only possible to the original type combination
Incorrect downcasts return None rather than panicking

§Implementation Notes

This trait is implemented by the internal AnyEngineWrapper struct. Users should not implement this trait directly - use the AsAnyAsyncEngine extension trait instead.