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   * 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.Util;
  import org.apache.cassandra.service.DiskErrorsHandlerService;
  import org.apache.cassandra.utils.concurrent.Condition;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.apache.cassandra.CassandraIsolatedJunit4ClassRunner;
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.utils.JVMStabilityInspector;
  
  
  @RunWith(CassandraIsolatedJunit4ClassRunner.class)
  public class CommitLogInitWithExceptionTest
  {
      private static Thread initThread;
      private final static Condition killed = Condition.newOneTimeCondition();
      @BeforeClass
      public static void setUp()
      {
          DatabaseDescriptor.daemonInitialization();
  
          if (DatabaseDescriptor.getDiskFailurePolicy() == Config.DiskFailurePolicy.die ||
              DatabaseDescriptor.getDiskFailurePolicy() == Config.DiskFailurePolicy.ignore)
          {
              DatabaseDescriptor.setDiskFailurePolicy(Config.DiskFailurePolicy.stop);
          }
  
          DatabaseDescriptor.setCommitLogSegmentMgrProvider(c -> new MockCommitLogSegmentMgr(c, DatabaseDescriptor.getCommitLogLocation()));
  
          JVMStabilityInspector.killerHook = (t) -> {
              Assert.assertEquals("MOCK EXCEPTION: createSegment", t.getMessage());
  
              try
              {
                  // Avoid JVM exit. The JVM still needs to run other junit tests.
                  return false;
              }
              finally
              {
                  killed.signal();
              }
          };
  
          DiskErrorsHandlerService.configure();
      }
  
      @Test
      public void testCommitLogInitWithException() {
          // This line will trigger initialization process because it's the first time to access CommitLog class.
          initThread = new Thread(CommitLog.instance::start);
  
          initThread.setName("initThread");
          initThread.start();
  
          Util.spinAssertEquals(true, killed::isSignalled, 10);
      }
  
      private static class MockCommitLogSegmentMgr extends CommitLogSegmentManagerStandard {
  
          public MockCommitLogSegmentMgr(CommitLog commitLog, String storageDirectory)
          {
              super(commitLog, storageDirectory);
          }
  
          @Override
          public CommitLogSegment createSegment()
          {
              throw new RuntimeException("MOCK EXCEPTION: createSegment");
          }
      }
  
  }
  