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.controller;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.utils.LogContext;
  import org.apache.kafka.server.common.TopicIdPartition;
  import org.apache.kafka.timeline.SnapshotRegistry;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class BrokerToElrsTest {
      private static final Uuid[] UUIDS = new Uuid[] {
              Uuid.fromString("z5XgH_fQSAK3-RYoF2ymgw"),
              Uuid.fromString("U52uRe20RsGI0RvpcTx33Q")
      };
  
      private static Set<TopicIdPartition> toSet(TopicIdPartition... partitions) {
          return new HashSet<>(List.of(partitions));
      }
  
      private static Set<TopicIdPartition> toSet(BrokersToIsrs.PartitionsOnReplicaIterator iterator) {
          HashSet<TopicIdPartition> set = new HashSet<>();
          while (iterator.hasNext()) {
              set.add(iterator.next());
          }
          return set;
      }
  
      @Test
      public void testIterator() {
          SnapshotRegistry snapshotRegistry = new SnapshotRegistry(new LogContext());
          BrokersToElrs brokersToElrs = new BrokersToElrs(snapshotRegistry);
          assertEquals(toSet(), toSet(brokersToElrs.partitionsWithBrokerInElr(1)));
          brokersToElrs.update(UUIDS[0], 0, null, new int[] {1, 2, 3});
          brokersToElrs.update(UUIDS[1], 1, null, new int[] {2, 3, 4});
          assertEquals(toSet(new TopicIdPartition(UUIDS[0], 0)),
              toSet(brokersToElrs.partitionsWithBrokerInElr(1)));
          assertEquals(toSet(new TopicIdPartition(UUIDS[0], 0),
                  new TopicIdPartition(UUIDS[1], 1)),
              toSet(brokersToElrs.partitionsWithBrokerInElr(2)));
          assertEquals(toSet(new TopicIdPartition(UUIDS[1], 1)),
              toSet(brokersToElrs.partitionsWithBrokerInElr(4)));
          assertEquals(toSet(), toSet(brokersToElrs.partitionsWithBrokerInElr(5)));
          brokersToElrs.update(UUIDS[1], 2, null, new int[] {3, 2, 1});
          assertEquals(toSet(new TopicIdPartition(UUIDS[0], 0),
                  new TopicIdPartition(UUIDS[1], 1),
                  new TopicIdPartition(UUIDS[1], 2)),
              toSet(brokersToElrs.partitionsWithBrokerInElr(2)));
      }
  }
  