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use crate::runtime::dev::prelude::*;
/// Black hole for messages.
///
/// # Message Inputs
///
/// `in`: Messages to count and drop. `Pmt::Finished` terminates the block.
///
/// # Message Outputs
///
/// No message outputs.
///
/// # Usage
/// ```
/// use futuresdr::blocks::MessageSink;
///
/// let sink = MessageSink::new();
/// ```
#[derive(Block)]
#[message_inputs(r#in)]
pub struct MessageSink {
n_received: u64,
}
impl MessageSink {
/// Create MessageSink block
pub fn new() -> Self {
Self { n_received: 0 }
}
async fn r#in(
&mut self,
io: &mut WorkIo,
_mo: &mut MessageOutputs,
_meta: &mut BlockMeta,
p: Pmt,
) -> Result<Pmt> {
match p {
Pmt::Finished => {
io.finished = true;
}
_ => {
self.n_received += 1;
}
}
Ok(Pmt::U64(self.n_received))
}
/// Get number of received messages.
pub fn received(&self) -> u64 {
self.n_received
}
}
impl Default for MessageSink {
fn default() -> Self {
Self::new()
}
}
#[doc(hidden)]
impl Kernel for MessageSink {
async fn deinit(&mut self, _mo: &mut MessageOutputs, _b: &mut BlockMeta) -> Result<()> {
debug!("n_received: {}", self.n_received);
Ok(())
}
}