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use prelude::v1::*;
use base::*;
use mutex::*;
use queue::*;
use units::*;
pub struct QueuePublisher<T: Sized + Copy> {
inner: Arc<Mutex<PublisherInner<T>>>,
}
pub struct QueueSubscriber<T: Sized + Copy> {
inner: Arc<SubscriberInner<T>>,
}
impl<T: Sized + Copy> QueuePublisher<T> {
pub fn new() -> Result<QueuePublisher<T>, FreeRtosError> {
let inner = PublisherInner {
subscribers: Vec::new(),
queue_next_id: 1,
};
Ok(QueuePublisher { inner: Arc::new(try!(Mutex::new(inner))) })
}
pub fn send<D: DurationTicks>(&self, item: T, max_wait: D) -> usize {
let mut sent_to = 0;
if let Ok(m) = self.inner.lock(max_wait) {
for subscriber in &m.subscribers {
if let Ok(_) = subscriber.queue.send(item, max_wait) {
sent_to += 1;
}
}
}
sent_to
}
pub fn subscribe<D: DurationTicks>(&self,
max_size: usize,
create_max_wait: D)
-> Result<QueueSubscriber<T>, FreeRtosError> {
let mut inner = try!(self.inner.lock(create_max_wait));
let queue = try!(Queue::new(max_size));
let id = inner.queue_next_id;
inner.queue_next_id += 1;
let subscriber = SubscriberInner {
id: id,
queue: queue,
publisher: self.inner.clone(),
};
let subscriber = Arc::new(subscriber);
inner.subscribers.push(subscriber.clone());
Ok(QueueSubscriber { inner: subscriber })
}
}
impl<T: Sized + Copy> Clone for QueuePublisher<T> {
fn clone(&self) -> Self {
QueuePublisher { inner: self.inner.clone() }
}
}
impl<T: Sized + Copy> Drop for QueueSubscriber<T> {
fn drop(&mut self) {
if let Ok(mut l) = self.inner.publisher.lock(Duration::infinite()) {
l.unsubscribe(&self.inner);
}
}
}
impl<T: Sized + Copy> QueueSubscriber<T> {
pub fn receive<D: DurationTicks>(&self, max_wait: D) -> Result<T, FreeRtosError> {
self.inner.queue.receive(max_wait)
}
}
struct PublisherInner<T: Sized + Copy> {
subscribers: Vec<Arc<SubscriberInner<T>>>,
queue_next_id: usize,
}
impl<T: Sized + Copy> PublisherInner<T> {
fn unsubscribe(&mut self, subscriber: &SubscriberInner<T>) {
self.subscribers.retain(|ref x| x.id != subscriber.id);
}
}
struct SubscriberInner<T: Sized + Copy> {
id: usize,
queue: Queue<T>,
publisher: Arc<Mutex<PublisherInner<T>>>,
}