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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.utils;
  
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.net.SocketException;
  import java.util.Arrays;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.io.FSReadError;
  import org.apache.cassandra.io.FSWriteError;
  import org.apache.cassandra.io.sstable.CorruptSSTableException;
  import org.apache.cassandra.service.DiskErrorsHandler;
  import org.apache.cassandra.service.DiskErrorsHandlerService;
  import org.assertj.core.api.Assertions;
  import org.apache.cassandra.service.CassandraDaemon;
  import org.apache.cassandra.service.StorageService;
  
  import static java.util.Arrays.asList;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  public class JVMStabilityInspectorTest
  {
      @BeforeClass
      public static void initDD()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @Test
      public void testKill() throws Exception
      {
          KillerForTests killerForTests = new KillerForTests();
          JVMStabilityInspector.Killer originalKiller = JVMStabilityInspector.replaceKiller(killerForTests);
  
          Config.DiskFailurePolicy oldPolicy = DatabaseDescriptor.getDiskFailurePolicy();
          Config.CommitFailurePolicy oldCommitPolicy = DatabaseDescriptor.getCommitFailurePolicy();
          DiskErrorsHandlerService.configure();
          try
          {
              CassandraDaemon daemon = new CassandraDaemon();
              daemon.completeSetup();
              for (boolean daemonSetupCompleted : Arrays.asList(false, true))
              {
                  // disk policy acts differently depending on if setup is complete or not; which is defined by
                  // the daemon thread not being null
                  StorageService.instance.registerDaemon(daemonSetupCompleted ? daemon : null);
  
                  try
                  {
                      killerForTests.reset();
                      JVMStabilityInspector.inspectThrowable(new IOException());
                      assertFalse(killerForTests.wasKilled());
  
                      DatabaseDescriptor.setDiskFailurePolicy(Config.DiskFailurePolicy.die);
                      killerForTests.reset();
                      JVMStabilityInspector.inspectThrowable(new FSReadError(new IOException(), "blah"));
                      assertTrue(killerForTests.wasKilled());
  
                      killerForTests.reset();
                      JVMStabilityInspector.inspectThrowable(new FSWriteError(new IOException(), "blah"));
                      assertTrue(killerForTests.wasKilled());
  
                      killerForTests.reset();
                      JVMStabilityInspector.inspectThrowable(new CorruptSSTableException(new IOException(), "blah"));
                      assertTrue(killerForTests.wasKilled());
  
                      killerForTests.reset();
                      JVMStabilityInspector.inspectThrowable(new RuntimeException(new CorruptSSTableException(new IOException(), "blah")));
                      assertTrue(killerForTests.wasKilled());
  
                      DatabaseDescriptor.setCommitFailurePolicy(Config.CommitFailurePolicy.die);
                      killerForTests.reset();
                      JVMStabilityInspector.inspectCommitLogThrowable(new Throwable());
                      assertTrue(killerForTests.wasKilled());
  
                      killerForTests.reset();
                      JVMStabilityInspector.inspectThrowable(new Exception(new IOException()));
                      assertFalse(killerForTests.wasKilled());
                  }
                  catch (Exception | Error e)
                  {
                      throw new AssertionError("Failure when daemonSetupCompleted=" + daemonSetupCompleted, e);
                  }
              }
          }
          finally
          {
              JVMStabilityInspector.replaceKiller(originalKiller);
              DatabaseDescriptor.setDiskFailurePolicy(oldPolicy);
              DatabaseDescriptor.setCommitFailurePolicy(oldCommitPolicy);
              StorageService.instance.registerDaemon(null);
              DiskErrorsHandlerService.set(DiskErrorsHandler.NoOpDiskErrorHandler.NO_OP);
          }
      }
  
      @Test
      public void testOutOfMemoryHandling()
      {
          for (Throwable oom : asList(new OutOfMemoryError(), new Exception(new OutOfMemoryError())))
          {
              try
              {
                  JVMStabilityInspector.inspectThrowable(oom);
                  fail("The JVMStabilityInspector should delegate the handling of OutOfMemoryErrors to the JVM");
              }
              catch (OutOfMemoryError e)
              {
                  assertTrue(true);
              }
          }
      }
  
      @Test
      public void testForceHeapSpaceOom()
      {
          try
          {
              JVMStabilityInspector.inspectThrowable(new OutOfMemoryError("Direct buffer memory"));
              fail("The JVMStabilityInspector should force trigger a heap space OutOfMemoryError and delegate the handling to the JVM");
          }
          catch (Throwable e)
          {
              assertSame(e.getClass(), OutOfMemoryError.class);
              assertEquals("Java heap space", e.getMessage());
          }
      }
  
      @Test
      public void testForceHeapSpaceOomExclude()
      {
          OutOfMemoryError error = new OutOfMemoryError("Java heap space");
          Assertions.assertThatThrownBy(() -> JVMStabilityInspector.inspectThrowable(error))
                    .isInstanceOf(OutOfMemoryError.class)
                    .isEqualTo(error);
      }
  
      @Test
      public void fileHandleTest()
      {
          KillerForTests killerForTests = new KillerForTests();
          JVMStabilityInspector.Killer originalKiller = JVMStabilityInspector.replaceKiller(killerForTests);
  
          try
          {
              killerForTests.reset();
              JVMStabilityInspector.inspectThrowable(new SocketException("Should not fail"));
              assertFalse(killerForTests.wasKilled());
  
              killerForTests.reset();
              JVMStabilityInspector.inspectThrowable(new FileNotFoundException("Also should not fail"));
              assertFalse(killerForTests.wasKilled());
  
              killerForTests.reset();
              JVMStabilityInspector.inspectThrowable(new SocketException());
              assertFalse(killerForTests.wasKilled());
  
              killerForTests.reset();
              JVMStabilityInspector.inspectThrowable(new FileNotFoundException());
              assertFalse(killerForTests.wasKilled());
  
              killerForTests.reset();
              JVMStabilityInspector.inspectThrowable(new SocketException("Too many open files"));
              assertTrue(killerForTests.wasKilled());
  
              killerForTests.reset();
              JVMStabilityInspector.inspectCommitLogThrowable(new FileNotFoundException("Too many open files"));
              assertTrue(killerForTests.wasKilled());
  
          }
          finally
          {
              JVMStabilityInspector.replaceKiller(originalKiller);
          }
      }
  }
  