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.distributed.impl;
  
  import java.util.concurrent.atomic.AtomicLong;
  import java.util.function.Consumer;
  
  import org.apache.cassandra.utils.JVMStabilityInspector;
  
  public class InstanceKiller extends JVMStabilityInspector.Killer
  {
      private static final AtomicLong KILL_ATTEMPTS = new AtomicLong(0);
  
      private final Consumer<Boolean> onKill;
  
      public InstanceKiller(Consumer<Boolean> onKill)
      {
          this.onKill = onKill != null ? onKill : ignore -> {};
      }
  
      public static long getKillAttempts()
      {
          return KILL_ATTEMPTS.get();
      }
  
      public static void clear()
      {
          KILL_ATTEMPTS.set(0);
      }
  
      @Override
      public void killCurrentJVM(Throwable t, boolean quiet)
      {
          KILL_ATTEMPTS.incrementAndGet();
          onKill.accept(quiet);
          // the bad part is that System.exit kills the JVM, so all code which calls kill won't hit the
          // next line; yet in in-JVM dtests System.exit is not desirable, so need to rely on a runtime exception
          // as a means to try to stop execution
          throw new InstanceShutdown();
      }
  
      public static final class InstanceShutdown extends RuntimeException { }
  }
  