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use crate::channel::{ChannelReceiver, ChannelSender, Message, NotifierChannelSender};
use crate::*;
use anyhow::anyhow;
use derive_more::Debug;
use derive_new::new;
use std::collections::VecDeque;
use std::option::Option;
use std::rc::Rc;
pub(crate) trait ChannelOperators<T>
where
T: Element + Send,
{
#[must_use]
fn send(
self: &Rc<Self>,
sender: ChannelSender<T>,
trigger: Option<Rc<dyn Node>>,
) -> Rc<dyn Node>;
}
impl<T> ChannelOperators<T> for dyn Stream<T>
where
T: Element + Send,
{
fn send(
self: &Rc<Self>,
sender: ChannelSender<T>,
trigger: Option<Rc<dyn Node>>,
) -> Rc<dyn Node> {
SenderNode::new(self.clone(), sender, trigger).into_node()
}
}
#[derive(new)]
pub(crate) struct SenderNode<T: Element + Send> {
source: Rc<dyn Stream<T>>,
sender: ChannelSender<T>,
trigger: Option<Rc<dyn Node>>,
}
impl<T: Element + Send> MutableNode for SenderNode<T> {
fn cycle(&mut self, state: &mut GraphState) -> anyhow::Result<bool> {
//println!("SenderNode::cycle");
if state.ticked(self.source.clone().as_node()) {
self.sender.send(state, self.source.peek_value())?;
Ok(true)
} else {
match &self.trigger {
Some(trig) => {
debug_assert!(state.ticked(trig.clone()));
self.sender.send_checkpoint(state)?;
}
None => {
anyhow::bail!("None trigger!");
}
}
Ok(false)
}
}
fn upstreams(&self) -> UpStreams {
let mut upstreams = vec![self.source.clone().as_node()];
if let Some(trig) = &self.trigger {
upstreams.push(trig.clone());
}
UpStreams::new(upstreams, Vec::new())
}
fn stop(&mut self, _state: &mut GraphState) -> anyhow::Result<()> {
self.sender.send_message(Message::EndOfStream)?;
Ok(())
}
}
#[derive(new, Debug)]
pub(crate) struct ReceiverStream<T: Element + Send> {
receiver: ChannelReceiver<T>,
#[debug(skip)]
trigger: Option<Rc<dyn Node>>,
notifier_channel: Option<NotifierChannelSender>,
#[new(default)]
value: Burst<T>,
#[new(default)]
finished: bool,
#[new(default)]
message_time: Option<NanoTime>,
#[new(default)]
queue: VecDeque<ValueAt<T>>,
}
impl<T: Element + Send> MutableNode for ReceiverStream<T> {
fn cycle(&mut self, state: &mut crate::GraphState) -> anyhow::Result<bool> {
//println!("ReceiverStream::cycle start {:?}", state.time());
let mut values: Burst<T> = Burst::new();
match state.run_mode() {
RunMode::RealTime => {
// cycle triggered by notiifcation from sender
loop {
if self.finished {
break;
} else {
match self.receiver.try_recv() {
Some(message) => match message {
Message::RealtimeValue(value) => {
values.push(value);
}
Message::HistoricalValue(value_at) => {
values.push(value_at.value);
}
Message::HistoricalBatch(_) => {
return Err(anyhow!(
"received HistoricalBatch but RunMode is RealTime"
));
}
Message::EndOfStream => self.finished = true,
Message::CheckPoint(_) => {}
Message::Error(err) => {
return Err(anyhow!(err));
}
},
None => break,
}
}
}
}
RunMode::HistoricalFrom(_) => {
// no notifications from sender, block until message recieved
loop {
if self.finished {
break;
}
if let Some(t) = self.message_time {
if t > state.time() {
break;
} else if t == state.time() {
if self.trigger.is_some() {
break;
} else {
//println!("callback {}", t + 1);
state.add_callback(t);
break;
}
}
}
// block for message
//println!("blocking for receive");
let message = self.receiver.recv();
match message {
Message::RealtimeValue(_) => {
return Err(anyhow!(
"received RealtimeValue but RunMode is Historical"
));
}
Message::HistoricalValue(value_at) => {
if value_at.time < state.time() {
return Err(anyhow!(
"received Historical message but with time less than graph time, {} < {}",
value_at.time,
state.time()
));
}
self.message_time = Some(value_at.time);
self.queue.push_back(value_at);
}
Message::HistoricalBatch(batch) => {
if batch.is_empty() {
continue;
}
// Validate: all timestamps must be >= current graph time
let min_time = batch.iter().map(|va| va.time).min().unwrap();
if min_time < state.time() {
return Err(anyhow!(
"received HistoricalBatch with timestamp less than graph time, {} < {}",
min_time,
state.time()
));
}
// Set message_time to earliest timestamp
self.message_time = Some(min_time);
// Unpack all values into queue
for value_at in batch.iter() {
self.queue.push_back(value_at.clone());
}
}
Message::EndOfStream => self.finished = true,
Message::CheckPoint(check_point) => {
self.message_time = Some(check_point);
}
Message::Error(err) => {
return Err(anyhow!(err));
}
}
}
while let Some(value_at) = self.queue.front() {
if value_at.time <= state.time() {
values.push(self.queue.pop_front().unwrap().value);
} else {
break;
}
}
if self.queue.is_empty() {
// Clear message_time when queue is empty to avoid infinite callback loops
self.message_time = None;
} else {
state.add_callback(self.queue.front().unwrap().time);
}
}
}
if !values.is_empty() {
self.value = values;
Ok(true)
} else {
Ok(false)
}
}
fn upstreams(&self) -> UpStreams {
let mut ups = Vec::new();
if let Some(trigger) = &self.trigger {
ups.push(trigger.clone());
}
UpStreams::new(ups, vec![])
}
fn setup(&mut self, state: &mut GraphState) -> anyhow::Result<()> {
match state.run_mode() {
RunMode::RealTime => {
if let Some(chan) = self.notifier_channel.take() {
chan.send(state.ready_notifier())
.map_err(|e| anyhow::anyhow!(e))?;
}
}
RunMode::HistoricalFrom(time) => {
if self.trigger.is_none() {
state.add_callback(time);
}
}
}
Ok(())
}
fn teardown(&mut self, _: &mut GraphState) -> anyhow::Result<()> {
self.receiver.teardown();
Ok(())
}
}
impl<T: Element + Send> StreamPeekRef<Burst<T>> for ReceiverStream<T> {
fn peek_ref(&self) -> &Burst<T> {
&self.value
}
}