flowly 0.6.1

Flowly is a library of modular and reusable components for building robust pipelines processing audio, video and other.
Documentation 
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use flowly::{Context, ServiceExt, switch};
use flowly_service::{Service, flow};
use futures::StreamExt;

pub struct Service1;
impl Service<i32> for Service1 {
    type Out = Result<u64, Error>;

    fn handle(&self, item: i32, _cx: &Context) -> impl futures::Stream<Item = Self::Out> {
        async_stream::try_stream! {
            yield item as u64;
        }
    }
}

pub struct Service2;
impl Service<i32> for Service2 {
    type Out = Result<u64, Error>;

    fn handle(&self, item: i32, _cx: &Context) -> impl futures::Stream<Item = Self::Out> {
        async_stream::try_stream! {
            yield item as u64 + 100;
        }
    }
}
#[derive(Debug)]
pub enum Error {}
pub struct Service3;
impl Service<i32> for Service3 {
    type Out = Result<u64, Error>;

    fn handle(&self, item: i32, _cx: &Context) -> impl futures::Stream<Item = Self::Out> {
        async_stream::try_stream! {
            yield item as u64 * 100;
        }
    }
}

#[tokio::main]
async fn main() {
    let x = flow::<_, Error>() // -
        .flow(
            switch::<i32, Result<u64, Error>, _, _>(|x| x % 4)
                .case(0, Service1)
                .case([1, 2], Service2)
                .default(Service3),
        );

    let cx = flowly_service::Context::new();
    let y = x.handle_stream(
        futures::stream::iter([0, 1i32, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]),
        &cx,
    );

    println!("{:?}", y.collect::<Vec<_>>().await);
}