Struct Sfr

Source

pub struct Sfr<S, M: Message> { /* private fields */ }

Expand description

§Service Future Response

Response type from a handler where a future must be awaited on the processing loop of the service. While the result of this future is being processed no other messages will be handled.

This provides a mutable borrow of the service and the service context to the future that is being awaited.

use interlink::prelude::*;
use std::time::Duration;
use tokio::time::sleep;

#[derive(Service)]
struct Test { value: String };

#[derive(Message)]
#[msg(rtype = "String")]
struct TestMessage {
    value: String,
}

impl Handler<TestMessage> for Test {
    type Response = Sfr<Self, TestMessage>;

    fn handle(&mut self, msg: TestMessage, ctx: &mut ServiceContext<Self>) -> Self::Response {
        // Additional logic can be run here before the future
        // response is created

        Sfr::new(move |service: &mut Test, ctx| {
            Box::pin(async move {
                // Some future that must be polled on the service loop
                sleep(Duration::from_millis(1000)).await;

                // Make use of the mutable access to service
                service.value = msg.value.clone();

                // You can return the response type of the message here
                "Response".to_string()
            })
        })
    }
}

#[tokio::test]
async fn test() {
    let service = Test { value: "Default".to_string() };
    let link = service.start();
     
    let res: String = link
        .send(TestMessage {
            value: "Example".to_string()
        })
        .await
        .unwrap();
     
    assert_eq!(&res, "Response")    

}

Implementations§

Source §

impl<S, M> Sfr<S, M>
where S: Service, M: Message,

Source

pub fn new(producer: P) -> Sfr<S, M>
where for<'a> P: FnOnce(&'a mut S, &'a mut ServiceContext<S>) -> BoxFuture<'a, M::Response> + Send + 'static,

Creates a new service future response. Takes a fn which accepts mutable access to the service and its context and returns a boxed future with the same lifetime as the borrow

producer The producer fn