adutra commented on code in PR #4648:
URL: https://github.com/apache/polaris/pull/4648#discussion_r3387530844
##########
runtime/service/src/main/java/org/apache/polaris/service/events/PolarisEventListeners.java:
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@@ -136,4 +163,54 @@ private void deliverEvent(
public boolean hasListeners(PolarisEventType eventType) {
return eventTypesWithListeners.contains(eventType);
}
+
+ private static class ListenerExecutor implements Executor {
+
+ private final Executor delegate;
+ private final Queue<Runnable> queue;
+ private final AtomicBoolean draining = new AtomicBoolean(false);
+
+ ListenerExecutor(Executor delegate, int capacity) {
+ this.delegate = delegate;
+ this.queue =
+ capacity == -1 ? new ConcurrentLinkedQueue<>() : new
ArrayBlockingQueue<>(capacity);
+ }
+
+ @Override
+ public void execute(@NonNull Runnable task) {
+ if (!queue.offer(task)) {
+ throw new RejectedExecutionException("Event listener queue is full");
+ }
+ if (draining.compareAndSet(false, true)) {
+ try {
+ delegate.execute(this::drain);
+ } catch (Exception e) {
+ draining.set(false);
Review Comment:
I tend to think that if an `Error` is thrown, we're in a bigger trouble than
just having `draining` out of syc. But OK to change.
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