frankvicky commented on code in PR #22552:
URL: https://github.com/apache/kafka/pull/22552#discussion_r3414577966
##########
group-coordinator/group-coordinator-api/src/main/java/org/apache/kafka/coordinator/group/api/streams/StreamsGroupTopologyDescription.java:
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@@ -58,24 +59,24 @@ public sealed interface Node {
public record Source(String name, Set<String> topics, Set<String>
successors) implements Node {
public Source {
Objects.requireNonNull(name, "name");
- topics = Set.copyOf(Objects.requireNonNull(topics, "topics"));
- successors = Set.copyOf(Objects.requireNonNull(successors,
"successors"));
+ topics =
Collections.unmodifiableSet(Objects.requireNonNull(topics, "topics"));
+ successors =
Collections.unmodifiableSet(Objects.requireNonNull(successors, "successors"));
}
}
public record Processor(String name, Set<String> stores, Set<String>
successors) implements Node {
public Processor {
Objects.requireNonNull(name, "name");
- stores = Set.copyOf(Objects.requireNonNull(stores, "stores"));
- successors = Set.copyOf(Objects.requireNonNull(successors,
"successors"));
+ stores =
Collections.unmodifiableSet(Objects.requireNonNull(stores, "stores"));
+ successors =
Collections.unmodifiableSet(Objects.requireNonNull(successors, "successors"));
}
Review Comment:
there's no production caller that retains a mutable reference (the converter
always constructs a fresh LinkedHashSet, tests pass Set.of(...)). Avoiding the
defensive copy here is intentional
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