content: /*
   * 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.modern.consumer;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.errors.FencedMemberEpochException;
  import org.apache.kafka.common.message.ConsumerGroupHeartbeatRequestData;
  import org.apache.kafka.coordinator.group.modern.Assignment;
  import org.apache.kafka.coordinator.group.modern.MemberState;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  import java.util.List;
  
  import static org.apache.kafka.coordinator.group.AssignmentTestUtil.mkAssignment;
  import static org.apache.kafka.coordinator.group.AssignmentTestUtil.mkTopicAssignment;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class CurrentAssignmentBuilderTest {
  
      @Test
      public void testStableToStable() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.STABLE)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.STABLE)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 1, 2, 3),
                      mkTopicAssignment(topicId2, 4, 5, 6)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testStableToStableWithNewPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.STABLE)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3, 4),
                  mkTopicAssignment(topicId2, 4, 5, 6, 7))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> -1)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.STABLE)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 1, 2, 3, 4),
                      mkTopicAssignment(topicId2, 4, 5, 6, 7)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testStableToUnrevokedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.STABLE)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3, 4),
                  mkTopicAssignment(topicId2, 5, 6, 7))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> -1)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.UNREVOKED_PARTITIONS)
                  .setMemberEpoch(10)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 2, 3),
                      mkTopicAssignment(topicId2, 5, 6)))
                  .setPartitionsPendingRevocation(mkAssignment(
                      mkTopicAssignment(topicId1, 1),
                      mkTopicAssignment(topicId2, 4)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testStableToUnreleasedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.STABLE)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3, 4),
                  mkTopicAssignment(topicId2, 4, 5, 6, 7))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.UNRELEASED_PARTITIONS)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 1, 2, 3),
                      mkTopicAssignment(topicId2, 4, 5, 6)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testStableToUnreleasedPartitionsWithOwnedPartitionsNotHavingRevokedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.STABLE)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 1, 2, 3),
                  mkTopicAssignment(topicId2, 4, 5, 7))))
              .withCurrentPartitionEpoch((topicId, __) ->
                  topicId2.equals(topicId) ? 10 : -1
              )
              .withOwnedTopicPartitions(List.of())
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.UNRELEASED_PARTITIONS)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 1, 2, 3),
                      mkTopicAssignment(topicId2, 4, 5)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testUnrevokedPartitionsToStable() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNREVOKED_PARTITIONS)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .setPartitionsPendingRevocation(mkAssignment(
                  mkTopicAssignment(topicId1, 1),
                  mkTopicAssignment(topicId2, 4)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> -1)
              .withOwnedTopicPartitions(Arrays.asList(
                  new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                      .setTopicId(topicId1)
                      .setPartitions(Arrays.asList(2, 3)),
                  new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                      .setTopicId(topicId2)
                      .setPartitions(Arrays.asList(5, 6))))
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.STABLE)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 2, 3),
                      mkTopicAssignment(topicId2, 5, 6)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testRemainsInUnrevokedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNREVOKED_PARTITIONS)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .setPartitionsPendingRevocation(mkAssignment(
                  mkTopicAssignment(topicId1, 1),
                  mkTopicAssignment(topicId2, 4)))
              .build();
  
          CurrentAssignmentBuilder currentAssignmentBuilder = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(12, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 3),
                  mkTopicAssignment(topicId2, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> -1);
  
          assertEquals(
              member,
              currentAssignmentBuilder
                  .withOwnedTopicPartitions(null)
                  .build()
          );
  
          assertEquals(
              member,
              currentAssignmentBuilder
                  .withOwnedTopicPartitions(Arrays.asList(
                      new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                          .setTopicId(topicId1)
                          .setPartitions(Arrays.asList(1, 2, 3)),
                      new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                          .setTopicId(topicId2)
                          .setPartitions(Arrays.asList(5, 6))))
                  .build()
          );
  
          assertEquals(
              member,
              currentAssignmentBuilder
                  .withOwnedTopicPartitions(Arrays.asList(
                      new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                          .setTopicId(topicId1)
                          .setPartitions(Arrays.asList(2, 3)),
                      new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                          .setTopicId(topicId2)
                          .setPartitions(Arrays.asList(4, 5, 6))))
                  .build()
          );
      }
  
      @Test
      public void testUnrevokedPartitionsToUnrevokedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNREVOKED_PARTITIONS)
              .setMemberEpoch(10)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .setPartitionsPendingRevocation(mkAssignment(
                  mkTopicAssignment(topicId1, 1),
                  mkTopicAssignment(topicId2, 4)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(12, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 3),
                  mkTopicAssignment(topicId2, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> -1)
              .withOwnedTopicPartitions(Arrays.asList(
                  new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                      .setTopicId(topicId1)
                      .setPartitions(Arrays.asList(2, 3)),
                  new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                      .setTopicId(topicId2)
                      .setPartitions(Arrays.asList(5, 6))))
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.UNREVOKED_PARTITIONS)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(10)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 3),
                      mkTopicAssignment(topicId2, 6)))
                  .setPartitionsPendingRevocation(mkAssignment(
                      mkTopicAssignment(topicId1, 2),
                      mkTopicAssignment(topicId2, 5)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testUnrevokedPartitionsToUnreleasedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNREVOKED_PARTITIONS)
              .setMemberEpoch(11)
              .setPreviousMemberEpoch(10)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3, 4),
                  mkTopicAssignment(topicId2, 5, 6, 7))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .withOwnedTopicPartitions(Arrays.asList(
                  new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                      .setTopicId(topicId1)
                      .setPartitions(Arrays.asList(2, 3)),
                  new ConsumerGroupHeartbeatRequestData.TopicPartitions()
                      .setTopicId(topicId2)
                      .setPartitions(Arrays.asList(5, 6))))
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.UNRELEASED_PARTITIONS)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(11)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 2, 3),
                      mkTopicAssignment(topicId2, 5, 6)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testUnreleasedPartitionsToStable() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNRELEASED_PARTITIONS)
              .setMemberEpoch(11)
              .setPreviousMemberEpoch(11)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(12, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.STABLE)
                  .setMemberEpoch(12)
                  .setPreviousMemberEpoch(11)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 2, 3),
                      mkTopicAssignment(topicId2, 5, 6)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testUnreleasedPartitionsToStableWithNewPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNRELEASED_PARTITIONS)
              .setMemberEpoch(11)
              .setPreviousMemberEpoch(11)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3, 4),
                  mkTopicAssignment(topicId2, 5, 6, 7))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> -1)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.STABLE)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(11)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 2, 3, 4),
                      mkTopicAssignment(topicId2, 5, 6, 7)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testUnreleasedPartitionsToUnreleasedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNRELEASED_PARTITIONS)
              .setMemberEpoch(11)
              .setPreviousMemberEpoch(11)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(11, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3, 4),
                  mkTopicAssignment(topicId2, 5, 6, 7))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .build();
  
          assertEquals(member, updatedMember);
      }
  
      @Test
      public void testUnreleasedPartitionsToUnrevokedPartitions() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNRELEASED_PARTITIONS)
              .setMemberEpoch(11)
              .setPreviousMemberEpoch(11)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 2, 3),
                  mkTopicAssignment(topicId2, 5, 6)))
              .build();
  
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(12, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 3),
                  mkTopicAssignment(topicId2, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.UNREVOKED_PARTITIONS)
                  .setMemberEpoch(11)
                  .setPreviousMemberEpoch(11)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 3),
                      mkTopicAssignment(topicId2, 6)))
                  .setPartitionsPendingRevocation(mkAssignment(
                      mkTopicAssignment(topicId1, 2),
                      mkTopicAssignment(topicId2, 5)))
                  .build(),
              updatedMember
          );
      }
  
      @Test
      public void testUnknownState() {
          Uuid topicId1 = Uuid.randomUuid();
          Uuid topicId2 = Uuid.randomUuid();
  
          ConsumerGroupMember member = new ConsumerGroupMember.Builder("member")
              .setState(MemberState.UNKNOWN)
              .setMemberEpoch(11)
              .setPreviousMemberEpoch(11)
              .setAssignedPartitions(mkAssignment(
                  mkTopicAssignment(topicId1, 3),
                  mkTopicAssignment(topicId2, 6)))
              .setPartitionsPendingRevocation(mkAssignment(
                  mkTopicAssignment(topicId1, 2),
                  mkTopicAssignment(topicId2, 5)))
              .build();
  
          // When the member is in an unknown state, the member is first to force
          // a reset of the client side member state.
          assertThrows(FencedMemberEpochException.class, () -> new CurrentAssignmentBuilder(member)
              .withTargetAssignment(12, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 3),
                  mkTopicAssignment(topicId2, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 10)
              .build());
  
          // Then the member rejoins with no owned partitions.
          ConsumerGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(12, new Assignment(mkAssignment(
                  mkTopicAssignment(topicId1, 3),
                  mkTopicAssignment(topicId2, 6))))
              .withCurrentPartitionEpoch((topicId, partitionId) -> 11)
              .withOwnedTopicPartitions(List.of())
              .build();
  
          assertEquals(
              new ConsumerGroupMember.Builder("member")
                  .setState(MemberState.STABLE)
                  .setMemberEpoch(12)
                  .setPreviousMemberEpoch(11)
                  .setAssignedPartitions(mkAssignment(
                      mkTopicAssignment(topicId1, 3),
                      mkTopicAssignment(topicId2, 6)))
                  .build(),
              updatedMember
          );
      }
  }
  