Trait eventually::query::Handler

pub trait Handler<T>: Send + Sync
where
    T: Message + Send + Sync,
{
    type Output: Send + Sync;
    type Error: Send + Sync;

    // Required method
    fn handle<'life0, 'async_trait>(
        &'life0 self,
        query: Envelope<T>
    ) -> Pin<Box<dyn Future<Output = Result<Self::Output, Self::Error>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

An Handler describes an implementation that is able to handle specific Queries.

The Handler evaluates the Domain Query and produces a result, here described through the Output associated type.

Required Associated Types

type Output: Send + Sync

The result type the Handler produces when evaluating a Query.

type Error: Send + Sync

The error type returned by the Handler when Query evaluation fails.

Required Methods

fn handle<'life0, 'async_trait>( &'life0 self, query: Envelope<T> ) -> Pin<Box<dyn Future<Output = Result<Self::Output, Self::Error>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Evaluates the Query provided and returns a result type, described by the Output parameter.

Errors

As the Handler can fail to evaluate the Query, an Error can be returned instead.

Implementors

impl<T, R, Err, F, Fut> Handler<T> for F

where T: Message + Send + Sync + 'static, R: Send + Sync, Err: Send + Sync, F: Send + Sync + Fn(Envelope<T>) -> Fut, Fut: Send + Sync + Future<Output = Result<R, Err>>,

type Output = R

type Error = Err