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.server.util;
  
  import org.apache.kafka.test.TestUtils;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.channels.OverlappingFileLockException;
  
  import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class FileLockTest {
      @Test
      void testLock() throws IOException {
          File tempFile = TestUtils.tempFile();
          FileLock lock1 = new FileLock(tempFile);
          try {
              lock1.lock();
              assertThrows(OverlappingFileLockException.class, lock1::lock);
  
              FileLock lock2 = new FileLock(tempFile);
              assertThrows(OverlappingFileLockException.class, lock2::lock);
              assertFalse(lock2.tryLock());
              lock1.unlock();
          } finally {
              lock1.destroy();
          }
      }
  
      @Test
      void testTryLock() throws IOException {
          File tempFile = TestUtils.tempFile();
          FileLock lock1 = new FileLock(tempFile);
          try {
              assertTrue(lock1.tryLock());
              assertFalse(lock1.tryLock());
  
              FileLock lock2 = new FileLock(tempFile);
              assertFalse(lock2.tryLock());
              assertThrows(OverlappingFileLockException.class, lock2::lock);
              lock1.unlock();
          } finally {
              lock1.destroy();
          }
      }
  
      @Test
      void testUnlock() throws IOException {
          File tempFile = TestUtils.tempFile();
          FileLock lock1 = new FileLock(tempFile);
          try {
              lock1.lock();
              lock1.unlock();
              lock1.lock();
              lock1.unlock();
  
              assertTrue(lock1.tryLock());
              lock1.unlock();
              assertTrue(lock1.tryLock());
              lock1.unlock();
  
              FileLock lock2 = new FileLock(tempFile);
              assertTrue(lock2.tryLock());
              lock2.unlock();
              assertDoesNotThrow(lock2::lock);
              lock2.unlock();
          } finally {
              lock1.destroy();
          }
      }
  
      @Test
      void testDestroy() throws IOException {
          File tempFile = TestUtils.tempFile();
          FileLock lock1 = new FileLock(tempFile);
          lock1.destroy();
          assertFalse(tempFile.exists());
          assertDoesNotThrow(lock1::destroy);
      }
  }
  