noir-compute 0.2.0

Network of Operators In Rust
Documentation 
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use std::fmt::Display;

use crate::block::{BlockStructure, OperatorKind, OperatorStructure};

use crate::operator::sink::{Sink, StreamOutputRef};
use crate::operator::{Operator, StreamElement};
use crate::scheduler::ExecutionMetadata;

#[derive(Debug)]
pub struct CollectCountSink<PreviousOperators>
where
    PreviousOperators: Operator<Out = usize>,
{
    prev: PreviousOperators,
    result: usize,
    output: StreamOutputRef<usize>,
}

impl<PreviousOperators> CollectCountSink<PreviousOperators>
where
    PreviousOperators: Operator<Out = usize>,
{
    pub(crate) fn new(prev: PreviousOperators, output: StreamOutputRef<usize>) -> Self {
        Self {
            prev,
            result: 0,
            output,
        }
    }
}

impl<PreviousOperators> Display for CollectCountSink<PreviousOperators>
where
    PreviousOperators: Operator<Out = usize>,
{
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{} -> CollectCountSink", self.prev)
    }
}

impl<PreviousOperators> Operator for CollectCountSink<PreviousOperators>
where
    PreviousOperators: Operator<Out = usize>,
{
    type Out = ();

    fn setup(&mut self, metadata: &mut ExecutionMetadata) {
        self.prev.setup(metadata);
    }

    fn next(&mut self) -> StreamElement<()> {
        match self.prev.next() {
            StreamElement::Item(c) | StreamElement::Timestamped(c, _) => {
                self.result += c;
                StreamElement::Item(())
            }
            StreamElement::Watermark(w) => StreamElement::Watermark(w),
            StreamElement::Terminate => {
                *self.output.lock().unwrap() = Some(self.result);
                StreamElement::Terminate
            }
            StreamElement::FlushBatch => StreamElement::FlushBatch,
            StreamElement::FlushAndRestart => StreamElement::FlushAndRestart,
        }
    }

    fn structure(&self) -> BlockStructure {
        let mut operator = OperatorStructure::new::<usize, _>("CollectCountSink");
        operator.kind = OperatorKind::Sink;
        self.prev.structure().add_operator(operator)
    }
}

impl<PreviousOperators> Sink for CollectCountSink<PreviousOperators> where
    PreviousOperators: Operator<Out = usize>
{
}

impl<PreviousOperators> Clone for CollectCountSink<PreviousOperators>
where
    PreviousOperators: Operator<Out = usize>,
{
    fn clone(&self) -> Self {
        panic!("CollectVecSink cannot be cloned, replication should be 1");
    }
}

#[cfg(test)]
mod tests {
    use itertools::Itertools;

    use crate::config::RuntimeConfig;
    use crate::environment::StreamContext;
    use crate::operator::source;

    #[test]
    fn collect_vec() {
        let env = StreamContext::new(RuntimeConfig::local(4));
        let source = source::IteratorSource::new(0..10u8);
        let res = env.stream(source).collect_vec();
        env.execute_blocking();
        assert_eq!(res.get().unwrap(), (0..10).collect_vec());
    }
}