PsiACE commented on code in PR #6618:
URL: https://github.com/apache/opendal/pull/6618#discussion_r2542957074
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core/src/layers/concurrent_limit.rs:
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@@ -90,24 +90,61 @@ use crate::*;
/// Ok(())
/// # }
/// ```
+/// ConcurrencySemaphore abstracts a semaphore-like concurrency primitive
+/// that yields an owned permit released on drop. It mirrors RetryLayer's
+/// interceptor pattern by serving as a generic extension point for the layer.
+pub trait ConcurrencySemaphore: Send + Sync + Any + Clone + 'static {
+ /// The owned permit type associated with the semaphore. Dropping it
+ /// must release the permit back to the semaphore.
+ type Permit: Send + Sync + 'static;
+
+ /// Acquire an owned permit asynchronously.
+ fn acquire_owned(&self) -> BoxFuture<'static, Self::Permit>;
Review Comment:
Switched the trait to a single `acquire` method that returns `impl Future +
MaybeSend`. Implementations still use `async fn acquire(&self)`, but the trait
now enforces the `Send` requirement our layer methods need.
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