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.clients.consumer;
  
  import org.apache.kafka.clients.consumer.internals.AutoOffsetResetStrategy;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.header.internals.RecordHeaders;
  import org.apache.kafka.common.record.TimestampType;
  
  import org.junit.jupiter.api.Test;
  
  import java.time.Duration;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Optional;
  import java.util.stream.IntStream;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class MockConsumerTest {
      
      private final MockConsumer<String, String> consumer = new MockConsumer<>(AutoOffsetResetStrategy.EARLIEST.name());
  
      @Test
      public void testSimpleMock() {
          consumer.subscribe(Collections.singleton("test"));
          assertEquals(0, consumer.poll(Duration.ZERO).count());
          consumer.rebalance(Arrays.asList(new TopicPartition("test", 0), new TopicPartition("test", 1)));
          // Mock consumers need to seek manually since they cannot automatically reset offsets
          HashMap<TopicPartition, Long> beginningOffsets = new HashMap<>();
          beginningOffsets.put(new TopicPartition("test", 0), 0L);
          beginningOffsets.put(new TopicPartition("test", 1), 0L);
          consumer.updateBeginningOffsets(beginningOffsets);
          consumer.seek(new TopicPartition("test", 0), 0);
          ConsumerRecord<String, String> rec1 = new ConsumerRecord<>("test", 0, 0, 0L, TimestampType.CREATE_TIME,
              0, 0, "key1", "value1", new RecordHeaders(), Optional.empty());
          ConsumerRecord<String, String> rec2 = new ConsumerRecord<>("test", 0, 1, 0L, TimestampType.CREATE_TIME,
              0, 0, "key2", "value2", new RecordHeaders(), Optional.empty());
          consumer.addRecord(rec1);
          consumer.addRecord(rec2);
          ConsumerRecords<String, String> recs = consumer.poll(Duration.ofMillis(1));
          Iterator<ConsumerRecord<String, String>> iter = recs.iterator();
          assertEquals(rec1, iter.next());
          assertEquals(rec2, iter.next());
          assertFalse(iter.hasNext());
          final TopicPartition tp = new TopicPartition("test", 0);
          assertEquals(2L, consumer.position(tp));
          assertEquals(1, recs.nextOffsets().size());
          assertEquals(new OffsetAndMetadata(2, Optional.empty(), ""), recs.nextOffsets().get(tp));
          consumer.commitSync();
          assertEquals(2L, consumer.committed(Collections.singleton(tp)).get(tp).offset());
      }
  
      @Test
      public void testConsumerRecordsIsEmptyWhenReturningNoRecords() {
          TopicPartition partition = new TopicPartition("test", 0);
          consumer.assign(Collections.singleton(partition));
          consumer.addRecord(new ConsumerRecord<>("test", 0, 0, null, null));
          consumer.updateEndOffsets(Collections.singletonMap(partition, 1L));
          consumer.seekToEnd(Collections.singleton(partition));
          ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1));
          assertEquals(0, records.count());
          assertTrue(records.isEmpty());
      }
  
      @Test
      public void shouldNotClearRecordsForPausedPartitions() {
          TopicPartition partition0 = new TopicPartition("test", 0);
          Collection<TopicPartition> testPartitionList = Collections.singletonList(partition0);
          consumer.assign(testPartitionList);
          consumer.addRecord(new ConsumerRecord<>("test", 0, 0, null, null));
          consumer.updateBeginningOffsets(Collections.singletonMap(partition0, 0L));
          consumer.seekToBeginning(testPartitionList);
  
          consumer.pause(testPartitionList);
          consumer.poll(Duration.ofMillis(1));
          consumer.resume(testPartitionList);
          ConsumerRecords<String, String> recordsSecondPoll = consumer.poll(Duration.ofMillis(1));
          assertEquals(1, recordsSecondPoll.count());
          assertEquals(1, recordsSecondPoll.nextOffsets().size());
          assertEquals(new OffsetAndMetadata(1, Optional.empty(), ""), recordsSecondPoll.nextOffsets().get(new TopicPartition("test", 0)));
      }
  
      @Test
      public void endOffsetsShouldBeIdempotent() {
          TopicPartition partition = new TopicPartition("test", 0);
          consumer.updateEndOffsets(Collections.singletonMap(partition, 10L));
          // consumer.endOffsets should NOT change the value of end offsets
          assertEquals(10L, (long) consumer.endOffsets(Collections.singleton(partition)).get(partition));
          assertEquals(10L, (long) consumer.endOffsets(Collections.singleton(partition)).get(partition));
          assertEquals(10L, (long) consumer.endOffsets(Collections.singleton(partition)).get(partition));
          consumer.updateEndOffsets(Collections.singletonMap(partition, 11L));
          // consumer.endOffsets should NOT change the value of end offsets
          assertEquals(11L, (long) consumer.endOffsets(Collections.singleton(partition)).get(partition));
          assertEquals(11L, (long) consumer.endOffsets(Collections.singleton(partition)).get(partition));
          assertEquals(11L, (long) consumer.endOffsets(Collections.singleton(partition)).get(partition));
      }
  
      @Test
      public void testDurationBasedOffsetReset() {
          MockConsumer<String, String> consumer = new MockConsumer<>("by_duration:PT1H");
          consumer.subscribe(Collections.singleton("test"));
          consumer.rebalance(Arrays.asList(new TopicPartition("test", 0), new TopicPartition("test", 1)));
          HashMap<TopicPartition, Long> durationBasedOffsets = new HashMap<>();
          durationBasedOffsets.put(new TopicPartition("test", 0), 10L);
          durationBasedOffsets.put(new TopicPartition("test", 1), 11L);
          consumer.updateDurationOffsets(durationBasedOffsets);
          ConsumerRecord<String, String> rec1 = new ConsumerRecord<>("test", 0, 10L, 0L, TimestampType.CREATE_TIME,
                  0, 0, "key1", "value1", new RecordHeaders(), Optional.empty());
          ConsumerRecord<String, String> rec2 = new ConsumerRecord<>("test", 0, 11L, 0L, TimestampType.CREATE_TIME,
                  0, 0, "key2", "value2", new RecordHeaders(), Optional.empty());
          consumer.addRecord(rec1);
          consumer.addRecord(rec2);
          ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1));
          Iterator<ConsumerRecord<String, String>> iter = records.iterator();
          assertEquals(rec1, iter.next());
          assertEquals(rec2, iter.next());
          assertFalse(iter.hasNext());
      }
  
      @Test
      public void testRebalanceListener() {
          final List<TopicPartition> revoked = new ArrayList<>();
          final List<TopicPartition> assigned = new ArrayList<>();
          ConsumerRebalanceListener consumerRebalanceListener = new ConsumerRebalanceListener() {
              @Override
              public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
                  revoked.clear();
                  revoked.addAll(partitions);
              }
  
              @Override
              public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
                  if (partitions.isEmpty()) {
                      return;
                  }
                  assigned.clear();
                  assigned.addAll(partitions);
              }
          };
  
  
          consumer.subscribe(Collections.singleton("test"), consumerRebalanceListener);
          assertEquals(0, consumer.poll(Duration.ZERO).count());
          List<TopicPartition> topicPartitionList = Arrays.asList(new TopicPartition("test", 0), new TopicPartition("test", 1));
          consumer.rebalance(topicPartitionList);
  
          assertTrue(revoked.isEmpty());
          assertEquals(2, assigned.size());
          assertTrue(assigned.contains(topicPartitionList.get(0)));
          assertTrue(assigned.contains(topicPartitionList.get(1)));
  
          consumer.rebalance(Collections.emptyList());
          assertEquals(2, assigned.size());
          assertTrue(revoked.contains(topicPartitionList.get(0)));
          assertTrue(revoked.contains(topicPartitionList.get(1)));
  
          consumer.rebalance(Collections.singletonList(topicPartitionList.get(0)));
          assertEquals(1, assigned.size());
          assertTrue(assigned.contains(topicPartitionList.get(0)));
  
          consumer.rebalance(Collections.singletonList(topicPartitionList.get(1)));
          assertEquals(1, assigned.size());
          assertTrue(assigned.contains(topicPartitionList.get(1)));
          assertEquals(1, revoked.size());
          assertTrue(revoked.contains(topicPartitionList.get(0)));
      }
      
      @Test
      public void testRe2JPatternSubscription() {
          assertThrows(IllegalArgumentException.class, () -> consumer.subscribe((SubscriptionPattern) null));
          assertThrows(IllegalArgumentException.class, () -> consumer.subscribe(new SubscriptionPattern("")));
  
          SubscriptionPattern pattern = new SubscriptionPattern("t.*");
          assertThrows(IllegalArgumentException.class, () -> consumer.subscribe(pattern, null));
  
          consumer.subscribe(pattern);
          assertTrue(consumer.subscription().isEmpty());
          // Check that the subscription to pattern was successfully applied in the mock consumer (using a different
          // subscription type should fail)
          assertThrows(IllegalStateException.class, () -> consumer.subscribe(List.of("topic1")));
      }
  
      @Test
      public void shouldReturnMaxPollRecords() {
          TopicPartition partition = new TopicPartition("test", 0);
          consumer.assign(Collections.singleton(partition));
          consumer.updateBeginningOffsets(Collections.singletonMap(partition, 0L));
  
          IntStream.range(0, 10).forEach(offset -> {
              consumer.addRecord(new ConsumerRecord<>("test", 0, offset, null, null));
          });
  
          consumer.setMaxPollRecords(2L);
  
          ConsumerRecords<String, String> records;
  
          records = consumer.poll(Duration.ofMillis(1));
          assertEquals(2, records.count());
  
          records = consumer.poll(Duration.ofMillis(1));
          assertEquals(2, records.count());
  
          consumer.setMaxPollRecords(Long.MAX_VALUE);
  
          records = consumer.poll(Duration.ofMillis(1));
          assertEquals(6, records.count());
  
          records = consumer.poll(Duration.ofMillis(1));
          assertTrue(records.isEmpty());
      }
  
  }
  