reddd 0.2.3

Domain-Driven Design (DDD) toolkit.
Documentation 
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/// A trait to be implemented by use cases.
pub trait UseCase {
    /// The input to the use case.
    type Input: Sync;

    /// The output of the use case.
    type Output: Sync;

    /// The type of the error that can occur during the use case execution.
    type Error: Sync + Send;
}

/// A trait to be implemented by use case handlers.
///
/// # Parameters
///
/// * `U` - The type of the use case to be handled.
/// * `S` - The type of the state of the application.
#[async_trait::async_trait]
pub trait UseCaseHandler<U: UseCase, S> {
    /// Asynchronously executes the use case.
    ///
    /// # Parameters
    /// - `input` - The input to the use case.
    /// - `state` - The state of the application.
    ///
    /// # Returns
    /// The output of the use case.
    async fn execute(input: U::Input, state: &S) -> Result<U::Output, U::Error>
    where
        U::Input: 'async_trait;
}

#[cfg(test)]
mod tests {
    use crate::domain::UseCase;
    use reddd_macros::UseCase;

    #[derive(UseCase)]
    #[usecase(input = "String", output = "i32", error = "()")]
    struct SampleUseCase;
}