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.storage.internals.checkpoint;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.errors.InconsistentTopicIdException;
  import org.apache.kafka.storage.internals.log.LogDirFailureChannel;
  import org.apache.kafka.test.TestUtils;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  class PartitionMetadataFileTest  {
      private final File dir = TestUtils.tempDirectory();
      private final File file = PartitionMetadataFile.newFile(dir);
  
      @Test
      public void testSetRecordWithDifferentTopicId() {
          PartitionMetadataFile partitionMetadataFile = new PartitionMetadataFile(file, null);
          Uuid topicId = Uuid.randomUuid();
          partitionMetadataFile.record(topicId);
          Uuid differentTopicId = Uuid.randomUuid();
          assertThrows(InconsistentTopicIdException.class, () -> partitionMetadataFile.record(differentTopicId));
      }
  
      @Test
      public void testSetRecordWithSameTopicId() {
          PartitionMetadataFile partitionMetadataFile = new PartitionMetadataFile(file, null);
          Uuid topicId = Uuid.randomUuid();
          partitionMetadataFile.record(topicId);
          assertDoesNotThrow(() -> partitionMetadataFile.record(topicId));
  
          Uuid sameTopicId = Uuid.fromString(topicId.toString());
          partitionMetadataFile.record(sameTopicId);
          assertDoesNotThrow(() -> partitionMetadataFile.record(topicId));
      }
  
      @Test
      public void testMaybeFlushWithTopicIdPresent() throws IOException {
          PartitionMetadataFile partitionMetadataFile = new PartitionMetadataFile(file, null);
  
          Uuid topicId = Uuid.randomUuid();
          partitionMetadataFile.record(topicId);
          partitionMetadataFile.maybeFlush();
  
          // The following content is encoded by PartitionMetadata#encode, which is invoked during the flush
          List<String> lines = Files.readAllLines(file.toPath());
          assertEquals(2, lines.size());
          assertEquals("version: 0", lines.get(0));
          assertEquals("topic_id: " + topicId, lines.get(1));
      }
  
      @Test
      public void testMaybeFlushWithNoTopicIdPresent() {
          PartitionMetadataFile partitionMetadataFile = new PartitionMetadataFile(file, null);
          partitionMetadataFile.maybeFlush();
  
          assertEquals(0, file.length());
      }
  
      @Test
      public void testRead() {
          LogDirFailureChannel channel = Mockito.mock(LogDirFailureChannel.class);
          PartitionMetadataFile partitionMetadataFile = new PartitionMetadataFile(file, channel);
  
          Uuid topicId = Uuid.randomUuid();
          partitionMetadataFile.record(topicId);
          partitionMetadataFile.maybeFlush();
  
          PartitionMetadata metadata = partitionMetadataFile.read();
          assertEquals(0, metadata.version());
          assertEquals(topicId, metadata.topicId());
      }
  }