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.connect.mirror;
  
  import org.apache.kafka.clients.producer.Callback;
  import org.apache.kafka.clients.producer.KafkaProducer;
  import org.apache.kafka.common.TopicPartition;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.ArgumentCaptor;
  
  import java.util.Map;
  import java.util.concurrent.Semaphore;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.when;
  
  public class OffsetSyncWriterTest {
      String topicName = "topic";
      @SuppressWarnings("unchecked")
      KafkaProducer<byte[], byte[]> producer = mock(KafkaProducer.class);
      TopicPartition topicPartition = new TopicPartition(topicName, 0);
  
      @Test
      public void testMaybeQueueOffsetSyncs() {
          int maxOffsetLag = 2;
  
          @SuppressWarnings("unchecked")
          KafkaProducer<byte[], byte[]> producer = mock(KafkaProducer.class);
          Semaphore outstandingOffsetSyncs = new Semaphore(1);
  
          OffsetSyncWriter offsetSyncWriter = new OffsetSyncWriter(producer, topicName, outstandingOffsetSyncs, maxOffsetLag);
  
          offsetSyncWriter.maybeQueueOffsetSyncs(topicPartition, 0, 1);
          assertFalse(offsetSyncWriter.getDelayedOffsetSyncs().containsKey(topicPartition));
          assertTrue(offsetSyncWriter.getPendingOffsetSyncs().containsKey(topicPartition));
          assertEquals(offsetSyncWriter.partitionStates().get(topicPartition).lastSyncDownstreamOffset, 1);
  
          offsetSyncWriter.maybeQueueOffsetSyncs(topicPartition, 1, 2);
          assertTrue(offsetSyncWriter.getDelayedOffsetSyncs().containsKey(topicPartition));
          assertEquals(offsetSyncWriter.partitionStates().get(topicPartition).lastSyncDownstreamOffset, 1);
      }
      
      @Test
      public void testFirePendingOffsetSyncs() {
          int maxOffsetLag = 1;
  
          Semaphore outstandingOffsetSyncs = new Semaphore(1);
  
          OffsetSyncWriter offsetSyncWriter = new OffsetSyncWriter(producer, topicName, outstandingOffsetSyncs, maxOffsetLag);
  
          offsetSyncWriter.maybeQueueOffsetSyncs(topicPartition, 0, 100);
          assertEquals(offsetSyncWriter.partitionStates().get(topicPartition).lastSyncDownstreamOffset, 100);
  
          offsetSyncWriter.firePendingOffsetSyncs();
  
          ArgumentCaptor<Callback> producerCallback = ArgumentCaptor.forClass(Callback.class);
          when(producer.send(any(), producerCallback.capture())).thenAnswer(mockInvocation -> {
              producerCallback.getValue().onCompletion(null, null);
              return null;
          });
  
          // We should have dispatched this sync to the producer
          verify(producer, times(1)).send(any(), any());
  
          offsetSyncWriter.maybeQueueOffsetSyncs(topicPartition, 2, 102);
          assertEquals(offsetSyncWriter.partitionStates().get(topicPartition).lastSyncDownstreamOffset, 102);
          offsetSyncWriter.firePendingOffsetSyncs();
  
          // in-flight offset syncs; will not try to send remaining offset syncs immediately
          verifyNoMoreInteractions(producer);
      }
  
      @Test
      public void testPromoteDelayedOffsetSyncs() {
          int maxOffsetLag = 50;
          @SuppressWarnings("unchecked")
          KafkaProducer<byte[], byte[]> producer = mock(KafkaProducer.class);
          Semaphore outstandingOffsetSyncs = new Semaphore(1);
  
          OffsetSyncWriter offsetSyncWriter = new OffsetSyncWriter(producer, topicName, outstandingOffsetSyncs, maxOffsetLag);
          offsetSyncWriter.maybeQueueOffsetSyncs(topicPartition, 0, 100);
          offsetSyncWriter.maybeQueueOffsetSyncs(topicPartition, 1, 101);
          offsetSyncWriter.promoteDelayedOffsetSyncs();
  
          assertTrue(offsetSyncWriter.getDelayedOffsetSyncs().isEmpty());
          Map<TopicPartition, OffsetSync> pendingOffsetSyncs = offsetSyncWriter.getPendingOffsetSyncs();
          assertEquals(1, pendingOffsetSyncs.size());
          assertEquals(1, pendingOffsetSyncs.get(topicPartition).upstreamOffset());
          assertEquals(101, pendingOffsetSyncs.get(topicPartition).downstreamOffset());
      }
  }
  