mediator 0.2.2

An implementation of the Mediator pattern in Rust
Documentation 
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/// Represents a request to the mediator.
pub trait Request<Res> {}

/// Handles a request from the mediator.
pub trait RequestHandler<Req, Res>
where
    Req: Request<Res>,
{
    /// Handle a request and returns the response.
    fn handle(&mut self, req: Req) -> Res;
}

/// Handles an async request from the mediator.
#[cfg(feature = "async")]
#[cfg_attr(feature = "async", async_trait::async_trait)]
pub trait AsyncRequestHandler<Req, Res>
where
    Req: Request<Res> + Send,
{
    /// Handle a request and returns the response.
    async fn handle(&mut self, req: Req) -> Res;
}

///////////////////// Implementations /////////////////////

impl<Req, Res, F> RequestHandler<Req, Res> for F
where
    F: FnMut(Req) -> Res,
    Req: Request<Res>,
{
    fn handle(&mut self, req: Req) -> Res {
        self(req)
    }
}

#[cfg(feature = "async")]
#[cfg_attr(feature = "async", async_trait::async_trait)]
impl<Req, Res, F, U> AsyncRequestHandler<Req, Res> for F
where
    Req: Request<Res> + Send + 'static,
    F: FnMut(Req) -> U + Sync + Send,
    U: std::future::Future<Output = Res> + Send,
{
    async fn handle(&mut self, req: Req) -> Res {
        self(req).await
    }
}