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.streams.processor.internals;
  
  import org.apache.kafka.common.Cluster;
  import org.apache.kafka.common.PartitionInfo;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.utils.Utils;
  import org.apache.kafka.streams.errors.TopologyException;
  import org.apache.kafka.streams.processor.internals.assignment.CopartitionedTopicsEnforcer;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  import java.util.TreeMap;
  
  import static org.hamcrest.CoreMatchers.equalTo;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class CopartitionedTopicsEnforcerTest {
  
      private final CopartitionedTopicsEnforcer validator = new CopartitionedTopicsEnforcer("thread ");
      private final Map<TopicPartition, PartitionInfo> partitions = new HashMap<>();
      private final Cluster cluster = Cluster.empty();
  
      @BeforeEach
      public void before() {
          partitions.put(
              new TopicPartition("first", 0),
              new PartitionInfo("first", 0, null, null, null));
          partitions.put(
              new TopicPartition("first", 1),
              new PartitionInfo("first", 1, null, null, null));
          partitions.put(
              new TopicPartition("second", 0),
              new PartitionInfo("second", 0, null, null, null));
          partitions.put(
              new TopicPartition("second", 1),
              new PartitionInfo("second", 1, null, null, null));
      }
  
      @Test
      public void shouldThrowTopologyBuilderExceptionIfNoPartitionsFoundForCoPartitionedTopic() {
          assertThrows(IllegalStateException.class, () -> validator.enforce(Collections.singleton("topic"),
              Collections.emptyMap(), cluster));
      }
  
      @Test
      public void shouldThrowTopologyBuilderExceptionIfPartitionCountsForCoPartitionedTopicsDontMatch() {
          partitions.remove(new TopicPartition("second", 0));
          assertThrows(TopologyException.class, () -> validator.enforce(Set.of("first", "second"),
                            Collections.emptyMap(),
                            cluster.withPartitions(partitions)));
      }
  
  
      @Test
      public void shouldEnforceCopartitioningOnRepartitionTopics() {
          final InternalTopicConfig config = createTopicConfig("repartitioned", 10);
  
          validator.enforce(Set.of("first", "second", config.name()),
                            Collections.singletonMap(config.name(), config),
                            cluster.withPartitions(partitions));
  
          assertThat(config.numberOfPartitions(), equalTo(Optional.of(2)));
      }
  
  
      @Test
      public void shouldSetNumPartitionsToMaximumPartitionsWhenAllTopicsAreRepartitionTopics() {
          final InternalTopicConfig one = createTopicConfig("one", 1);
          final InternalTopicConfig two = createTopicConfig("two", 15);
          final InternalTopicConfig three = createTopicConfig("three", 5);
          final Map<String, InternalTopicConfig> repartitionTopicConfig = new HashMap<>();
  
          repartitionTopicConfig.put(one.name(), one);
          repartitionTopicConfig.put(two.name(), two);
          repartitionTopicConfig.put(three.name(), three);
  
          validator.enforce(Set.of(one.name(),
                                        two.name(),
                                        three.name()),
                            repartitionTopicConfig,
                            cluster
          );
  
          assertThat(one.numberOfPartitions(), equalTo(Optional.of(15)));
          assertThat(two.numberOfPartitions(), equalTo(Optional.of(15)));
          assertThat(three.numberOfPartitions(), equalTo(Optional.of(15)));
      }
  
      @Test
      public void shouldThrowAnExceptionIfRepartitionTopicConfigsWithEnforcedNumOfPartitionsHaveDifferentNumOfPartitions() {
          final InternalTopicConfig topic1 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-1", 10);
          final InternalTopicConfig topic2 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-2", 5);
  
          final TopologyException ex = assertThrows(
              TopologyException.class,
              () -> validator.enforce(Set.of(topic1.name(), topic2.name()),
                                      Utils.mkMap(Utils.mkEntry(topic1.name(), topic1),
                                                  Utils.mkEntry(topic2.name(), topic2)),
                                      cluster.withPartitions(partitions))
          );
  
          final TreeMap<String, Integer> sorted = new TreeMap<>(
              Utils.mkMap(Utils.mkEntry(topic1.name(), topic1.numberOfPartitions().orElseThrow()),
                          Utils.mkEntry(topic2.name(), topic2.numberOfPartitions().orElseThrow()))
          );
  
          assertEquals(String.format("Invalid topology: thread " +
                                     "Following topics do not have the same number of partitions: " +
                                     "[%s]", sorted), ex.getMessage());
      }
  
      @Test
      public void shouldNotThrowAnExceptionWhenRepartitionTopicConfigsWithEnforcedNumOfPartitionsAreValid() {
          final InternalTopicConfig topic1 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-1", 10);
          final InternalTopicConfig topic2 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-2", 10);
  
          validator.enforce(Set.of(topic1.name(), topic2.name()),
                            Utils.mkMap(Utils.mkEntry(topic1.name(), topic1),
                                        Utils.mkEntry(topic2.name(), topic2)),
                            cluster.withPartitions(partitions));
  
          assertThat(topic1.numberOfPartitions(), equalTo(Optional.of(10)));
          assertThat(topic2.numberOfPartitions(), equalTo(Optional.of(10)));
      }
  
      @Test
      public void shouldThrowAnExceptionWhenNumberOfPartitionsOfNonRepartitionTopicAndRepartitionTopicWithEnforcedNumOfPartitionsDoNotMatch() {
          final InternalTopicConfig topic1 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-1", 10);
  
          final TopologyException ex = assertThrows(
              TopologyException.class,
              () -> validator.enforce(Set.of(topic1.name(), "second"),
                                      Utils.mkMap(Utils.mkEntry(topic1.name(), topic1)),
                                      cluster.withPartitions(partitions))
          );
  
          assertEquals(String.format("Invalid topology: thread Number of partitions [%s] " +
                                     "of repartition topic [%s] " +
                                     "doesn't match number of partitions [%s] of the source topic.",
                                     topic1.numberOfPartitions().orElseThrow(), topic1.name(), 2), ex.getMessage());
      }
  
      @Test
      public void shouldNotThrowAnExceptionWhenNumberOfPartitionsOfNonRepartitionTopicAndRepartitionTopicWithEnforcedNumOfPartitionsMatch() {
          final InternalTopicConfig topic1 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-1", 2);
  
          validator.enforce(Set.of(topic1.name(), "second"),
                            Utils.mkMap(Utils.mkEntry(topic1.name(), topic1)),
                            cluster.withPartitions(partitions));
  
          assertThat(topic1.numberOfPartitions(), equalTo(Optional.of(2)));
      }
  
      @Test
      public void shouldDeductNumberOfPartitionsFromRepartitionTopicWithEnforcedNumberOfPartitions() {
          final InternalTopicConfig topic1 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-1", 2);
          final InternalTopicConfig topic2 = createTopicConfig("repartitioned-2", 5);
          final InternalTopicConfig topic3 = createRepartitionTopicConfigWithEnforcedNumberOfPartitions("repartitioned-3", 2);
  
          validator.enforce(Set.of(topic1.name(), topic2.name()),
                            Utils.mkMap(Utils.mkEntry(topic1.name(), topic1),
                                        Utils.mkEntry(topic2.name(), topic2),
                                        Utils.mkEntry(topic3.name(), topic3)),
                            cluster.withPartitions(partitions));
  
          assertEquals(topic1.numberOfPartitions(), topic2.numberOfPartitions());
          assertEquals(topic2.numberOfPartitions(), topic3.numberOfPartitions());
      }
  
      private InternalTopicConfig createTopicConfig(final String repartitionTopic,
                                                    final int partitions) {
          final InternalTopicConfig repartitionTopicConfig =
              new RepartitionTopicConfig(repartitionTopic, Collections.emptyMap());
  
          repartitionTopicConfig.setNumberOfPartitions(partitions);
          return repartitionTopicConfig;
      }
  
      private InternalTopicConfig createRepartitionTopicConfigWithEnforcedNumberOfPartitions(final String repartitionTopic,
                                                                                             final int partitions) {
          return new RepartitionTopicConfig(repartitionTopic,
                                            Collections.emptyMap(),
                                            partitions,
                                            true);
      }
  
  }