lucasbru commented on code in PR #18676:
URL: https://github.com/apache/kafka/pull/18676#discussion_r1939480745


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/streams/TopologyMetadata.java:
##########
@@ -0,0 +1,94 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.coordinator.group.streams;
+
+import org.apache.kafka.coordinator.group.streams.assignor.TopologyDescriber;
+import org.apache.kafka.coordinator.group.streams.topics.ConfiguredSubtopology;
+import org.apache.kafka.coordinator.group.streams.topics.ConfiguredTopology;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+/**
+ * The topology metadata class is used by the {@link 
org.apache.kafka.coordinator.group.streams.assignor.TaskAssignor} to obtain 
topic and
+ * partition metadata for the topology that the streams group using.
+ *
+ * @param topicMetadata The topic Ids mapped to their corresponding {@link 
TopicMetadata} object, which contains topic and partition
+ *                      metadata.
+ */
+public record TopologyMetadata(Map<String, TopicMetadata> topicMetadata, 
ConfiguredTopology topology) implements TopologyDescriber {
+
+    public TopologyMetadata {
+        Objects.requireNonNull(topicMetadata);
+        Objects.requireNonNull(topology);

Review Comment:
   Made it an immutable collection of subtopologies.



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