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use crate::Factory;
use atomic_immut::AtomicImmut;
use std::sync::Arc;
#[derive(Debug, Default)]
pub struct SwappableFactory<T>(Arc<AtomicImmut<T>>);
impl<T: Factory> SwappableFactory<T> {
pub fn new(inner: T) -> Self {
SwappableFactory(Arc::new(AtomicImmut::new(inner)))
}
pub fn get(&self) -> Arc<T> {
self.0.load()
}
pub fn swap(&self, new: T) -> Arc<T> {
self.0.swap(new)
}
}
impl<T: Factory> Factory for SwappableFactory<T> {
type Item = T::Item;
fn create(&self) -> Self::Item {
self.0.load().create()
}
}
impl<T> Clone for SwappableFactory<T> {
fn clone(&self) -> Self {
SwappableFactory(Arc::clone(&self.0))
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::{CloneFactory, DefaultFactory, Factory};
#[test]
fn swappable_factory_works() {
let f = SwappableFactory::new(CloneFactory::new(32));
assert_eq!(f.create(), 32);
f.swap(CloneFactory::new(50));
assert_eq!(f.create(), 50);
}
#[test]
fn swappable_box_factory_works() {
let first: Box<Factory<Item = i32> + 'static> = Box::new(CloneFactory::new(32));
let f = SwappableFactory::new(first);
assert_eq!(f.create(), 32);
let second = Box::new(DefaultFactory::new());
f.swap(second);
assert_eq!(f.create(), 0);
}
}