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//! When configurator for a binding for types inside of a [`AsyncDIContainer`].
use std::any::type_name;
use std::marker::PhantomData;
use std::sync::Arc;
use crate::di_container::BindingOptions;
use crate::errors::async_di_container::AsyncBindingWhenConfiguratorError;
use crate::util::use_double;
use_double!(crate::di_container::asynchronous::AsyncDIContainer);
/// When configurator for a binding for type `Interface` inside a [`AsyncDIContainer`].
pub struct AsyncBindingWhenConfigurator<Interface>
where
Interface: 'static + ?Sized + Send + Sync,
{
di_container: Arc<AsyncDIContainer>,
interface_phantom: PhantomData<Interface>,
}
impl<Interface> AsyncBindingWhenConfigurator<Interface>
where
Interface: 'static + ?Sized + Send + Sync,
{
pub(crate) fn new(di_container: Arc<AsyncDIContainer>) -> 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>(BindingOptions::new())
.await
.map_or_else(
|| {
Err(AsyncBindingWhenConfiguratorError::BindingNotFound(
type_name::<Interface>(),
))
},
Ok,
)?;
self.di_container
.set_binding::<Interface>(BindingOptions::new().name(name), binding)
.await;
Ok(())
}
}
#[cfg(test)]
mod tests
{
use mockall::predicate::eq;
use super::*;
use crate::di_container::asynchronous::MockAsyncDIContainer;
use crate::provider::r#async::MockIAsyncProvider;
use crate::test_utils::subjects_async;
#[tokio::test]
async fn when_named_works()
{
let mut di_container_mock = MockAsyncDIContainer::new();
di_container_mock
.expect_remove_binding::<dyn subjects_async::INumber>()
.with(eq(BindingOptions::new()))
.return_once(|_name| Some(Box::new(MockIAsyncProvider::new())))
.once();
di_container_mock
.expect_set_binding::<dyn subjects_async::INumber>()
.withf(|binding_options, _provider| binding_options.name == Some("awesome"))
.return_once(|_name, _provider| ())
.once();
let binding_when_configurator = AsyncBindingWhenConfigurator::<
dyn subjects_async::INumber,
>::new(Arc::new(di_container_mock));
assert!(binding_when_configurator
.when_named("awesome")
.await
.is_ok());
}
}
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