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use crate::{
ServiceDependency, ServiceDescriptor, ServiceLifetime, ServiceProvider, Ref, Type,
};
use spin::Once;
use std::any::Any;
use std::marker::PhantomData;
/// Represents a [`ServiceDescriptor`](crate::ServiceDescriptor) builder.
pub struct ServiceDescriptorBuilder<TSvc: Any + ?Sized, TImpl> {
lifetime: ServiceLifetime,
service_type: Type,
implementation_type: Type,
dependencies: Vec<ServiceDependency>,
_marker_svc: PhantomData<TSvc>,
_marker_impl: PhantomData<TImpl>,
}
impl<TSvc: Any + ?Sized, TImpl> ServiceDescriptorBuilder<TSvc, TImpl> {
/// Defines the factory method used to activate the service and returns the [`ServiceDescriptor`](crate::ServiceDescriptor).
///
/// # Arguments
///
/// * `factory` - The factory method used to create the service
pub fn from(mut self, factory: impl Fn(&ServiceProvider) -> Ref<TSvc> + 'static) -> ServiceDescriptor {
ServiceDescriptor::new(
self.lifetime,
self.service_type,
self.implementation_type,
if self.dependencies.is_empty() {
Vec::with_capacity(0)
} else {
self.dependencies.shrink_to_fit();
self.dependencies
},
Once::new(),
Ref::new(move |sp| Ref::new(factory(sp))),
)
}
/// Defines a dependency used by the service.
///
/// # Arguments
///
/// * `dependency` - The [dependency](crate::ServiceDependency) associated with the service
pub fn depends_on(mut self, dependency: ServiceDependency) -> Self {
if !self.dependencies.contains(&dependency) {
self.dependencies.push(dependency);
}
self
}
/// Initializes a new service descriptor builder.
///
/// # Arguments
///
/// * `lifetime` - The [lifetime](crate::ServiceLifetime) of the service
/// * `implementation_type` - The service implementation [type](crate::Type)
pub fn new(lifetime: ServiceLifetime, implementation_type: Type) -> Self {
Self {
lifetime,
service_type: Type::of::<TSvc>(),
implementation_type,
dependencies: Vec::new(),
_marker_svc: PhantomData,
_marker_impl: PhantomData,
}
}
/// Initializes a new service descriptor builder.
///
/// # Arguments
///
/// * `lifetime` - The [lifetime](crate::ServiceLifetime) of the service
/// * `implementation_type` - The service implementation [type](crate::Type)
pub fn keyed<TKey>(lifetime: ServiceLifetime, implementation_type: Type) -> Self {
Self {
lifetime,
service_type: Type::keyed::<TKey, TSvc>(),
implementation_type,
dependencies: Vec::new(),
_marker_svc: PhantomData,
_marker_impl: PhantomData,
}
}
}