update

examples/functions.rs

@@ -9,8 +9,9 @@ fn main() {
 
     let (input, output) = rally(items, |item: &_| {
         std::thread::sleep(Duration::from_millis(item * 100));
-        return 0;
-    });
+        return Some(0);
+    })
+    .unwrap();
 
     println!("RALLY RESULTS: {input:?} -> {output:?}");
 }

src/lib.rs

@@ -27,10 +27,12 @@ pub static UNION: Lazy<
 /// Rally Function
 ///
 /// This executes a thread for every item executing `f(&item) -> X`. Whatever function returns first is returned while every other thread is killed.
-pub fn rally<T: Send + Sync + 'static, F, X: Send + 'static>(items: Vec<T>, f: F) -> (T, X)
+pub fn rally<T: Send + Sync + 'static, F, X: Send + 'static>(items: Vec<T>, f: F) -> Option<(T, X)>
 where
-    F: Fn(&T) -> X + Send + Sync + Copy + 'static,
+    F: Fn(&T) -> Option<X> + Send + Sync + Copy + 'static,
 {
+    let item_len = items.len();
+
     let (tx, rx) = mpsc::channel();
     let items_len = items.len();
     let mut handles = Vec::new();
@@ -51,16 +53,25 @@ where
 
     drop(tx);
 
-    let (fastest_item, fastest_result, elapsed) = rx.recv().unwrap();
+    let mut count = 0;
 
-    for handle in handles {
-        // todo : threads do not get killed here
-        handle.thread().unpark();
+    while count < item_len {
+        let (fastest_item, fastest_result, elapsed) = rx.recv().unwrap();
+        count += 1;
+
+        if fastest_result.is_some() {
+            for handle in handles {
+                // todo : threads do not get killed here
+                handle.thread().unpark();
+            }
+
+            log::info!("Rally ended with {items_len} items in {elapsed:?}");
+
+            return Some((fastest_item, fastest_result.unwrap()));
+        }
     }
 
-    log::info!("Rally ended with {items_len} items in {elapsed:?}");
-
-    (fastest_item, fastest_result)
+    None
 }
 
 pub fn retry<O, F: Fn() -> Option<O>>(f: F) -> O {

src/service.rs

@@ -61,8 +61,6 @@ pub struct ServiceManager {
     pub mode: ServiceMode,
 }
 
-// TODO : impl decay mode
-
 /// The mode on which services should operate
 pub enum ServiceMode {
     /// Behave like a daemon. Services can never die and will come back to life after beeing killed. They will always haunt you.