hakuban 0.8.5

Data-object sharing library
Documentation 
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use std::{
	collections::VecDeque,
	sync::{Arc, Mutex},
	task::Waker,
};

use crate::ObjectStateStream;

pub(crate) struct ObserveContractShared {
	object_state_stream_ready_for_check_out: VecDeque<ObjectStateStream>,
	waker: Option<Waker>,
}

impl ObserveContractShared {
	pub fn new() -> ObserveContractShared {
		ObserveContractShared { object_state_stream_ready_for_check_out: VecDeque::new(), waker: None }
	}

	fn wake(&mut self) {
		if let Some(waker) = self.waker.take() {
			waker.wake();
		}
	}

	pub fn poll_next(&mut self, cx: &mut std::task::Context<'_>) -> std::task::Poll<Option<ObjectStateStream>> {
		if let Some(object_state_stream) = self.object_state_stream_ready_for_check_out.pop_front() {
			std::task::Poll::Ready(Some(object_state_stream))
		} else {
			self.waker = Some(cx.waker().clone());
			std::task::Poll::Pending
		}
	}
}

#[derive(Clone)]
pub(crate) struct ObserveContractInlet {
	shared: Arc<Mutex<ObserveContractShared>>,
}

impl ObserveContractInlet {
	pub fn new(shared: Arc<Mutex<ObserveContractShared>>) -> ObserveContractInlet {
		ObserveContractInlet { shared }
	}

	pub fn stream_created(&mut self, object_state_stream: ObjectStateStream) {
		let mut shared = self.shared.lock().unwrap();
		shared.object_state_stream_ready_for_check_out.push_back(object_state_stream);
		shared.wake();
	}
}