chia7712 commented on code in PR #22271:
URL: https://github.com/apache/kafka/pull/22271#discussion_r3521259992
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clients/src/main/java/org/apache/kafka/clients/consumer/internals/SubscriptionState.java:
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@@ -1004,8 +1062,42 @@ synchronized void movePartitionToEnd(TopicPartition tp) {
assignment.moveToEnd(tp);
}
- public synchronized Optional<ConsumerRebalanceListener>
rebalanceListener() {
- return rebalanceListener;
+ private synchronized Optional<RebalanceListener> rebalanceListener() {
+ return Optional.ofNullable(rebalanceListener.get());
+ }
+
+ private synchronized Consumer<?, ?> rebalanceConsumerOrThrow() {
+ return Optional.ofNullable(rebalanceConsumer.get())
+ .orElseThrow(() -> new IllegalStateException("Rebalance
consumer has not been initialized"));
+ }
+
+ /** @return true if a {@link RebalanceListener} has been registered with
this subscription. */
+ public synchronized boolean hasRebalanceListener() {
+ return rebalanceListener.get() != null;
+ }
+
+ /** Invoke {@link RebalanceListener#onPartitionsAssigned(Collection,
RebalanceConsumer)} on the given partitions.*/
+ public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
+ rebalanceListener().ifPresent(rl ->
invokeRebalanceListener(partitions, rl::onPartitionsAssigned));
Review Comment:
> Actually, I see https://github.com/apache/kafka/pull/21337 shipped. Maybe
we can roll our own annotations somewhere there. Would that be better?
yes, that could be discussed in another KIP :)
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