refactor

veilid-tools/src/eventual_value_clone.rs

@@ -0,0 +1,105 @@
+use super::*;
+
+use eventual_base::*;
+
+pub struct EventualValueClone<T: Unpin + Clone> {
+    inner: Arc<Mutex<EventualBaseInner<T>>>,
+}
+
+impl<T: Unpin + Clone> core::fmt::Debug for EventualValueClone<T> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        f.debug_struct("EventualValueClone").finish()
+    }
+}
+
+impl<T: Unpin + Clone> Clone for EventualValueClone<T> {
+    fn clone(&self) -> Self {
+        Self {
+            inner: self.inner.clone(),
+        }
+    }
+}
+
+impl<T: Unpin + Clone> EventualBase for EventualValueClone<T> {
+    type ResolvedType = T;
+    fn base_inner(&self) -> MutexGuard<EventualBaseInner<Self::ResolvedType>> {
+        self.inner.lock()
+    }
+}
+
+impl<T: Unpin + Clone> Default for EventualValueClone<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<T: Unpin + Clone> EventualValueClone<T> {
+    pub fn new() -> Self {
+        Self {
+            inner: Arc::new(Mutex::new(EventualBaseInner::new())),
+        }
+    }
+
+    pub fn instance(&self) -> EventualValueCloneFuture<T>
+    where
+        T: Clone + Unpin,
+    {
+        EventualValueCloneFuture {
+            id: None,
+            eventual: self.clone(),
+        }
+    }
+
+    pub fn resolve(&self, value: T) -> EventualResolvedFuture<Self> {
+        self.resolve_to_value(value)
+    }
+
+    pub fn value(&self) -> Option<T> {
+        let inner = self.inner.lock();
+        inner.resolved_value_ref().clone()
+    }
+}
+
+pub struct EventualValueCloneFuture<T: Unpin + Clone> {
+    id: Option<usize>,
+    eventual: EventualValueClone<T>,
+}
+
+impl<T: Unpin + Clone> Future for EventualValueCloneFuture<T> {
+    type Output = T;
+    fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> task::Poll<Self::Output> {
+        let this = &mut *self;
+        let (out, some_value) = {
+            let mut inner = this.eventual.base_inner();
+            let out = inner.instance_poll(&mut this.id, cx);
+            (out, inner.resolved_value_ref().clone())
+        };
+        match out {
+            None => task::Poll::<Self::Output>::Pending,
+            Some(wakers) => {
+                // Wake all EventualResolvedFutures
+                for w in wakers {
+                    w.wake();
+                }
+                task::Poll::<Self::Output>::Ready(some_value.unwrap())
+            }
+        }
+    }
+}
+
+impl<T> Drop for EventualValueCloneFuture<T>
+where
+    T: Clone + Unpin,
+{
+    fn drop(&mut self) {
+        if let Some(id) = self.id.take() {
+            let wakers = {
+                let mut inner = self.eventual.base_inner();
+                inner.remove_waker(id)
+            };
+            for w in wakers {
+                w.wake();
+            }
+        }
+    }
+}