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.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import java.io.BufferedWriter;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStreamWriter;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.util.OptionalLong;
  
  import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  
  @Timeout(value = 10)
  class CleanShutdownFileHandlerTest {
      @Test
      public void testCleanShutdownFileBasic() {
          File logDir;
          logDir = assertDoesNotThrow(() -> Files.createTempDirectory("kafka-cleanShutdownFile").toFile());
          CleanShutdownFileHandler cleanShutdownFileHandler = new CleanShutdownFileHandler(logDir.getPath());
          assertDoesNotThrow(() -> cleanShutdownFileHandler.write(10L));
          assertTrue(cleanShutdownFileHandler.exists());
          assertEquals(OptionalLong.of(10L), cleanShutdownFileHandler.read());
          assertDoesNotThrow(() -> cleanShutdownFileHandler.delete());
          assertFalse(cleanShutdownFileHandler.exists());
      }
  
      @Test
      public void testCleanShutdownFileNonExist() {
          File logDir;
          logDir = assertDoesNotThrow(() -> Files.createTempDirectory("kafka-cleanShutdownFile").toFile());
          CleanShutdownFileHandler cleanShutdownFileHandler = new CleanShutdownFileHandler(logDir.getPath());
          assertDoesNotThrow(() -> cleanShutdownFileHandler.write(10L, 0));
          assertTrue(cleanShutdownFileHandler.exists());
          assertDoesNotThrow(() -> cleanShutdownFileHandler.delete());
          assertFalse(cleanShutdownFileHandler.exists());
          assertEquals(OptionalLong.empty(), cleanShutdownFileHandler.read());
      }
  
      @Test
      public void testCleanShutdownFileCanParseWithUnknownFields() throws IOException {
          File logDir;
          logDir = assertDoesNotThrow(() -> Files.createTempDirectory("kafka-cleanShutdownFile").toFile());
          CleanShutdownFileHandler cleanShutdownFileHandler = new CleanShutdownFileHandler(logDir.getPath());
  
          FileOutputStream os = new FileOutputStream(cleanShutdownFileHandler.cleanShutdownFile);
          BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os, StandardCharsets.UTF_8));
          bw.write("{\"version\":0,\"brokerEpoch\":10,\"unknown\":123}");
          bw.flush();
          os.getFD().sync();
  
          assertTrue(cleanShutdownFileHandler.exists());
          assertEquals(OptionalLong.of(10L), cleanShutdownFileHandler.read());
          assertDoesNotThrow(() -> cleanShutdownFileHandler.delete());
          assertFalse(cleanShutdownFileHandler.exists());
      }
  }