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.util.byterewrite;
  
  import net.bytebuddy.ByteBuddy;
  import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
  import net.bytebuddy.implementation.MethodDelegation;
  import net.bytebuddy.implementation.bind.annotation.SuperCall;
  import org.apache.cassandra.gms.EndpointState;
  import org.apache.cassandra.utils.Shared;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  public class Undead
  {
      public static void install(ClassLoader cl)
      {
          new ByteBuddy().rebase(EndpointState.class)
                         .method(named("markDead")).intercept(MethodDelegation.to(BB.class))
                         .make()
                         .load(cl, ClassLoadingStrategy.Default.INJECTION);
      }
  
      public static void close()
      {
          State.enabled = false;
      }
  
      @Shared
      public static class State
      {
          public static volatile boolean enabled = false;
      }
  
      public static class BB
      {
          public static void markDead(@SuperCall Runnable real)
          {
              if (State.enabled)
              {
                  // don't let anything get marked dead...
                  return;
              }
              real.run();
          }
      }
  }
  