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use crate::prelude::*;
/// Get samples out of a Flowgraph into a channel.
///
/// # Inputs
///
/// `in`: Samples retrieved from the flowgraph
///
/// # Usage
/// ```
/// use futuresdr::futures::channel::mpsc;
/// use futuresdr::blocks::{VectorSource, ChannelSink};
/// use futuresdr::runtime::Flowgraph;
///
/// let mut fg = Flowgraph::new();
/// let (mut tx, rx) = mpsc::channel(10);
/// let vec = vec![0, 1, 2];
/// let src = fg.add_block(VectorSource::<u32>::new(vec));
/// let cs = fg.add_block(ChannelSink::<u32>::new(tx));
/// // start flowgraph
/// ```
#[derive(Block)]
pub struct ChannelSink<T, I = DefaultCpuReader<T>>
where
T: Send + Clone + 'static,
I: CpuBufferReader<Item = T>,
{
#[input]
input: I,
sender: mpsc::Sender<Box<[T]>>,
}
impl<T, I> ChannelSink<T, I>
where
T: Send + Clone + 'static,
I: CpuBufferReader<Item = T>,
{
/// Create ChannelSink block
pub fn new(sender: mpsc::Sender<Box<[T]>>) -> Self {
Self {
input: I::default(),
sender,
}
}
}
#[doc(hidden)]
impl<T, I> Kernel for ChannelSink<T, I>
where
T: Send + Clone + 'static,
I: CpuBufferReader<Item = T>,
{
async fn work(
&mut self,
io: &mut WorkIo,
_mio: &mut MessageOutputs,
_meta: &mut BlockMeta,
) -> Result<()> {
let i = self.input.slice();
let i_len = i.len();
if !i.is_empty() {
if let Err(err) = self.sender.try_send(i.into()) {
warn!("Channel Sink: {}", err.to_string());
io.finished = true;
}
self.input.consume(i_len);
}
if self.input.finished() {
io.finished = true;
}
Ok(())
}
}