dajac commented on code in PR #23732: URL: https://github.com/apache/kafka/pull/23732#discussion_r4248918558
########## group-coordinator/src/test/java/org/apache/kafka/coordinator/group/assignor/uniform2/GroupSpecFixture.java: ########## @@ -0,0 +1,103 @@ +/* + * 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.assignor.uniform2; + +import org.apache.kafka.common.Uuid; +import org.apache.kafka.coordinator.group.api.assignor.GroupSpec; +import org.apache.kafka.coordinator.group.api.assignor.SubscriptionType; +import org.apache.kafka.coordinator.group.modern.Assignment; +import org.apache.kafka.coordinator.group.modern.GroupSpecImpl; +import org.apache.kafka.coordinator.group.modern.MemberSubscriptionAndAssignmentImpl; + +import java.util.HashMap; +import java.util.HashSet; +import java.util.LinkedHashMap; +import java.util.Map; +import java.util.Optional; +import java.util.Set; + +/** + * The group spec of a test: its members, in the order they are added, with their subscriptions + * and current partitions. The group is homogeneous when every member has the same subscription, + * as the coordinator declares it, and the current partitions are the target assignment. + * + * <p>The spec is derived as the members are added, and built once: the fixture cannot change + * afterwards. + */ +public final class GroupSpecFixture { + private final Map<String, MemberSubscriptionAndAssignmentImpl> members = new LinkedHashMap<>(); + private final Map<Uuid, Map<Integer, String>> invertedTargetAssignment = new HashMap<>(); + private Set<Uuid> firstSubscription; + private boolean sameSubscriptions = true; + private boolean built; + + /** + * Adds a member holding no partitions. + * + * @param memberId The member id. + * @param topics The topics it subscribes to. + * @return This fixture. + */ + public GroupSpecFixture withMember(String memberId, Set<Uuid> topics) { + return withMember(memberId, topics, Map.of()); + } + + /** + * Adds a member. + * + * @param memberId The member id. + * @param topics The topics it subscribes to. + * @param partitions The partitions it holds, per topic. + * @return This fixture. + */ + public GroupSpecFixture withMember(String memberId, Set<Uuid> topics, Map<Uuid, Set<Integer>> partitions) { + checkNotBuilt(); + if (members.containsKey(memberId)) { + throw new IllegalArgumentException("Member " + memberId + " is already added"); + } + members.put(memberId, new MemberSubscriptionAndAssignmentImpl(Optional.empty(), Optional.empty(), topics, + new Assignment(partitions))); + + var subscription = new HashSet<>(topics); + if (firstSubscription == null) { + firstSubscription = subscription; + } else { + sameSubscriptions &= firstSubscription.equals(subscription); + } + partitions.forEach((topicId, topicPartitions) -> { + var owners = invertedTargetAssignment.computeIfAbsent(topicId, k -> new HashMap<>()); + topicPartitions.forEach(partition -> owners.put(partition, memberId)); + }); + return this; + } + + /** + * @return The group spec. + */ + public GroupSpec build() { + checkNotBuilt(); + built = true; + var subscriptionType = sameSubscriptions ? SubscriptionType.HOMOGENEOUS : SubscriptionType.HETEROGENEOUS; + return new GroupSpecImpl(members, subscriptionType, invertedTargetAssignment); + } + + private void checkNotBuilt() { + if (built) { + throw new IllegalStateException("The group spec is already built"); + } + } Review Comment: Well, it was my choice. We don't copy the data structures so reusing the builder is actually wrong. I could introduce a copy and remove it. I am fine with both. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
