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.cassandra.db.commitlog;
  
  import org.apache.cassandra.io.util.File;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.jboss.byteman.contrib.bmunit.BMRule;
  import org.jboss.byteman.contrib.bmunit.BMRules;
  import org.jboss.byteman.contrib.bmunit.BMUnitRunner;
  
  import java.io.IOException;
  import java.nio.file.Files;
  
  import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  
  @RunWith(BMUnitRunner.class)
  public class DirectIOSegmentBytemanTest
  {
      @BeforeClass
      public static void beforeClass() throws IOException
      {
          File commitLogDir = new File(Files.createTempDirectory("commitLogDir"));
          DatabaseDescriptor.daemonInitialization(() -> {
              Config config = DatabaseDescriptor.loadConfig();
              config.commitlog_directory = commitLogDir.toString();
              return config;
          });
      }
  
  
      @Test
      @BMRules(rules = { @BMRule(name = "Commitlog dir do not support direct io",
      targetClass = "FileUtils",
      targetMethod = "getBlockSize",
      action = "return 0;") } )
      public void testDirectIOUnSupportWithDirectConfig()
      {
          DatabaseDescriptor.setCommitLogWriteDiskAccessMode(Config.DiskAccessMode.direct);
          assertThatExceptionOfType(ConfigurationException.class).isThrownBy(DatabaseDescriptor::initializeCommitLogDiskAccessMode)
                                                                 .withMessage("commitlog_disk_access_mode can not be set to direct when direct IO is not supported by the file system.");
      }
  }
  