perf(drivers): fixed-rate poll pacing with overrun counter; non-blocking unsubscribe

2026-08-16 04:26:20 -04:00
parent 684e59d871
commit 9cf400f1e8
9 changed files with 277 additions and 43 deletions
@@ -838,10 +838,11 @@ public sealed class FocasDriver : IDriver, IReadable, IWritable, ITagDiscovery,
        Task.FromResult(_poll.Subscribe(fullReferences, publishingInterval));

    /// <inheritdoc />
-    public Task UnsubscribeAsync(ISubscriptionHandle handle, CancellationToken cancellationToken)
+    public async Task UnsubscribeAsync(ISubscriptionHandle handle, CancellationToken cancellationToken)
    {
-        _poll.Unsubscribe(handle);
-        return Task.CompletedTask;
+        // Async teardown: the engine drains the in-flight poll without blocking the caller's
+        // thread — this runs inside a DriverInstanceActor mailbox turn.
+        await _poll.UnsubscribeAsync(handle).ConfigureAwait(false);
    }

    // ---- IHostConnectivityProbe ----