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use std::future::Future;
use std::sync::Arc;
use tokio::sync::mpsc::{channel, Receiver, Sender};
use tokio::sync::Semaphore;
use tokio::time::{Duration, Instant};
pub async fn judge_me<C, F, Fut>(count: usize, parallelism: usize, context: C, run: F)
where
C: Clone + Send + Sync + 'static,
F: Fn(C, usize) -> Fut + Send + Sync + Copy + 'static,
Fut: Future<Output = bool> + Send,
{
let mut successful: usize = 0;
let semaphore = Arc::new(Semaphore::new(parallelism));
let (tx, mut rx): (Sender<bool>, Receiver<bool>) = channel(count);
for i in 0..count {
let sem = semaphore.clone();
let ctx = context.clone();
let tx = tx.clone();
tokio::spawn(async move {
let _permit = sem.acquire().await.expect("semaphore is open. qed");
let start = Instant::now();
let success = run(ctx, i).await;
let elapsed = std::cmp::max(Duration::from_micros(1), Instant::now() - start);
log::debug!("task {:?} completed in {:?}", i, elapsed);
tx.send(success).await.unwrap();
});
}
drop(tx);
while let Some(success) = rx.recv().await {
log::debug!("handling results");
if success {
successful += 1;
}
}
log::debug!("successful results {:?}", successful);
}
#[cfg(test)]
mod tests {
use super::*;
#[tokio::test]
async fn it_works() {
let test = "test";
judge_me(10, 2, test, |_a, _i| async { true }).await;
}
}