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//! When configurator for a binding for types inside of a [`IAsyncDIContainer`].
//!
//! [`IAsyncDIContainer`]: crate::di_container::asynchronous::IAsyncDIContainer
use std::any::type_name;
use std::marker::PhantomData;
use std::sync::Arc;
use crate::di_container::asynchronous::IAsyncDIContainer;
use crate::errors::async_di_container::AsyncBindingWhenConfiguratorError;
/// When configurator for a binding for type 'Interface' inside a [`IAsyncDIContainer`].
///
/// [`IAsyncDIContainer`]: crate::di_container::asynchronous::IAsyncDIContainer
pub struct AsyncBindingWhenConfigurator<Interface, DIContainerType>
where
Interface: 'static + ?Sized + Send + Sync,
DIContainerType: IAsyncDIContainer,
{
di_container: Arc<DIContainerType>,
interface_phantom: PhantomData<Interface>,
}
impl<Interface, DIContainerType> AsyncBindingWhenConfigurator<Interface, DIContainerType>
where
Interface: 'static + ?Sized + Send + Sync,
DIContainerType: IAsyncDIContainer,
{
pub(crate) fn new(di_container: Arc<DIContainerType>) -> Self
{
Self {
di_container,
interface_phantom: PhantomData,
}
}
/// Configures the binding to have a name.
///
/// # Errors
/// Will return Err if no binding for the interface already exists.
pub async fn when_named(
&self,
name: &'static str,
) -> Result<(), AsyncBindingWhenConfiguratorError>
{
let binding = self
.di_container
.remove_binding::<Interface>(None)
.await
.map_or_else(
|| {
Err(AsyncBindingWhenConfiguratorError::BindingNotFound(
type_name::<Interface>(),
))
},
Ok,
)?;
self.di_container
.set_binding::<Interface>(Some(name), binding)
.await;
Ok(())
}
}
#[cfg(test)]
mod tests
{
use mockall::predicate::eq;
use super::*;
use crate::provider::r#async::MockIAsyncProvider;
use crate::test_utils::{mocks, subjects_async};
#[tokio::test]
async fn when_named_works()
{
let mut di_container_mock =
mocks::async_di_container::MockAsyncDIContainer::new();
di_container_mock
.expect_remove_binding::<dyn subjects_async::INumber>()
.with(eq(None))
.return_once(|_name| Some(Box::new(MockIAsyncProvider::new())))
.once();
di_container_mock
.expect_set_binding::<dyn subjects_async::INumber>()
.withf(|name, _provider| name == &Some("awesome"))
.return_once(|_name, _provider| ())
.once();
let binding_when_configurator = AsyncBindingWhenConfigurator::<
dyn subjects_async::INumber,
mocks::async_di_container::MockAsyncDIContainer,
>::new(Arc::new(di_container_mock));
assert!(matches!(
binding_when_configurator.when_named("awesome").await,
Ok(_)
));
}
}
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