Hands-On Microservices with Rust

Abstract messages handler

Create the QueueHandler struct in the queue_actor.rs file:

pub trait QueueHandler: 'static {     type Incoming: for<'de> Deserialize<'de>;     type Outgoing: Serialize;      fn incoming(&self) -> &str;     fn outgoing(&self) -> &str;     fn handle(         &self,         id: &TaskId,         incoming: Self::Incoming,     ) -> Result<Option<Self::Outgoing>, Error>; }

QueueHandler is a trait that has two associated types and three methods. It requires a static lifetime for types that will implement the QueueHandler trait, because instances of this trait will be used as fields of actors that have a static lifetime as well.

This trait has the Incoming associated type, which represents the incoming message type and requires the type to implement the Deserialize trait ...