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use std::any::Any;
use std::collections::HashMap;
use super::{queue::PushError, Key, Queue, QueueId};
#[derive(Default)]
pub struct State {
store: HashMap<usize, Box<dyn Any>>,
queues: HashMap<usize, Box<dyn Any>>,
next_id: usize,
}
#[allow(clippy::len_without_is_empty)]
impl State {
#[must_use = "Discarding key results in leaking inserted value"]
pub fn insert<V: 'static>(&mut self, value: V) -> Key<V> {
let id = super::generate_next_id();
self.store.insert(id, Box::new(value));
Key::new(id)
}
pub fn remove<V: 'static>(&mut self, key: Key<V>) -> Option<V> {
self.store
.remove(&key.id)
.map(|v| *v.downcast::<V>().expect("Ensured by the key type."))
}
#[must_use]
pub fn get<V: 'static>(&self, key: Key<V>) -> Option<&V> {
self.store
.get(&key.id)
.map(|v| v.downcast_ref::<V>().expect("Ensured by the key type."))
}
#[must_use]
pub fn get_mut<V: 'static>(&mut self, key: Key<V>) -> Option<&mut V> {
self.store
.get_mut(&key.id)
.map(|v| v.downcast_mut::<V>().expect("Ensured by the key type."))
}
pub fn add_queue<Q: Queue + 'static>(&mut self, queue: Q) -> QueueId<Q> {
let id = self.next_id;
self.next_id += 1;
self.queues.insert(id, Box::new(queue));
QueueId::new(id)
}
pub fn send<Q: Queue + 'static>(
&mut self,
queue: QueueId<Q>,
value: Q::Item,
) -> Result<(), PushError> {
self.queue_mut(queue).push(value)
}
pub fn recv<Q: Queue + 'static>(&mut self, queue: QueueId<Q>) -> Option<Q::Item> {
self.queue_mut(queue).pop()
}
#[must_use]
pub fn len<Q: Queue + 'static>(&self, queue: QueueId<Q>) -> usize {
self.queue(queue).len()
}
#[must_use]
pub fn queue<Q: Queue + 'static>(&self, queue: QueueId<Q>) -> &Q {
self.queues
.get(&queue.id)
.expect("Queues cannot be removed so it must exist.")
.downcast_ref::<Q>()
.expect("Ensured by the key type.")
}
#[must_use]
pub fn queue_mut<Q: Queue + 'static>(&mut self, queue: QueueId<Q>) -> &mut Q {
self.queues
.get_mut(&queue.id)
.expect("Queues cannot be removed so it must exist.")
.downcast_mut::<Q>()
.expect("Ensured by the key type.")
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::{Fifo, PriorityQueue};
#[test]
fn test_add_remove_key_values() {
let mut state = State::default();
let id = state.insert(1);
assert_eq!(state.remove(id), Some(1));
assert_eq!(state.remove(id), None);
let id = state.insert("string_slice");
assert_eq!(state.get(id).copied(), Some("string_slice"));
assert_eq!(state.remove(id), Some("string_slice"));
assert_eq!(state.remove(id), None);
let id = state.insert(vec![String::from("S")]);
assert_eq!(state.remove(id), Some(vec![String::from("S")]));
assert_eq!(state.remove(id), None);
}
#[test]
fn test_modify_key_values() {
let mut state = State::default();
let id = state.insert(1);
*state.get_mut(id).unwrap() = 2;
assert_eq!(state.remove(id), Some(2));
assert_eq!(state.remove(id), None);
}
#[test]
fn test_bounded_queue() {
let mut state = State::default();
let qid = state.add_queue(Fifo::<&str>::bounded(2));
assert_eq!(state.len(qid), 0);
assert!(state.send(qid, "A").is_ok());
assert!(state.send(qid, "B").is_ok());
assert!(state.send(qid, "C").is_err());
assert_eq!(state.recv(qid), Some("A"));
assert_eq!(state.recv(qid), Some("B"));
assert_eq!(state.recv(qid), None);
}
#[test]
fn test_unbounded_queue() {
let mut state = State::default();
let qid = state.add_queue(Fifo::default());
assert_eq!(state.len(qid), 0);
assert!(state.send(qid, "A").is_ok());
assert!(state.queue_mut(qid).push("B").is_ok());
assert!(state.send(qid, "C").is_ok());
assert_eq!(state.recv(qid), Some("A"));
assert_eq!(state.recv(qid), Some("B"));
assert_eq!(state.recv(qid), Some("C"));
assert_eq!(state.recv(qid), None);
}
#[test]
fn test_bounded_queue_priority() {
let mut state = State::default();
let qid = state.add_queue(PriorityQueue::bounded(2));
assert_eq!(state.queue(qid).len(), 0);
assert!(state.send(qid, 2).is_ok());
assert!(state.send(qid, 1).is_ok());
assert!(state.send(qid, 3).is_err());
assert_eq!(state.recv(qid), Some(2));
assert_eq!(state.recv(qid), Some(1));
assert_eq!(state.recv(qid), None);
}
#[test]
fn test_unbounded_queue_priority() {
let mut state = State::default();
let qid = state.add_queue(PriorityQueue::default());
assert_eq!(state.len(qid), 0);
assert!(state.send(qid, 2).is_ok());
assert!(state.send(qid, 1).is_ok());
assert!(state.send(qid, 3).is_ok());
assert_eq!(state.recv(qid), Some(3));
assert_eq!(state.recv(qid), Some(2));
assert_eq!(state.recv(qid), Some(1));
assert_eq!(state.recv(qid), None);
}
}