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.test;
  
  import java.io.IOException;
  import java.io.Serializable;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.cassandra.utils.concurrent.Condition;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.gms.EndpointState;
  import org.apache.cassandra.gms.IEndpointStateChangeSubscriber;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.service.StorageService;
  
  
  import static java.lang.Thread.sleep;
  import static org.apache.cassandra.distributed.api.ConsistencyLevel.ALL;
  import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
  import static org.apache.cassandra.distributed.api.Feature.NETWORK;
  import static org.apache.cassandra.gms.Gossiper.instance;
  import static org.apache.cassandra.net.Verb.GOSSIP_DIGEST_ACK;
  import static org.apache.cassandra.net.Verb.GOSSIP_DIGEST_SYN;
  import static org.apache.cassandra.utils.concurrent.Condition.newOneTimeCondition;
  
  public class GossipShutdownTest extends TestBaseImpl
  {
      /**
       * Makes sure that a node that has shutdown doesn't come back as live (without being restarted)
       */
      @Test
      public void shutdownStayDownTest() throws IOException, InterruptedException, ExecutionException
      {
          ExecutorService es = Executors.newSingleThreadExecutor();
          try (Cluster cluster = init(builder().withNodes(2)
                                               .withConfig(config -> config.with(GOSSIP)
                                                                           .with(NETWORK))
                                               .start()))
          {
              cluster.schemaChange("create table "+KEYSPACE+".tbl (id int primary key, v int)");
  
              for (int i = 0; i < 10; i++)
                  cluster.coordinator(1).execute("insert into "+KEYSPACE+".tbl (id, v) values (?,?)", ALL, i, i);
  
              Condition timeToShutdown = newOneTimeCondition();
              Condition waitForShutdown = newOneTimeCondition();
              AtomicBoolean signalled = new AtomicBoolean(false);
              Future f = es.submit(() -> {
                  await(timeToShutdown);
  
                  cluster.get(1).runOnInstance(() -> {
                      instance.register(new EPChanges());
                  });
  
                  cluster.get(2).runOnInstance(() -> {
                      StorageService.instance.setIsShutdownUnsafeForTests(true);
                      instance.stop();
                  });
                  waitForShutdown.signalAll();
              });
  
              cluster.filters().outbound().from(2).to(1).verbs(GOSSIP_DIGEST_SYN.id).messagesMatching((from, to, message) -> true).drop();
              cluster.filters().outbound().from(2).to(1).verbs(GOSSIP_DIGEST_ACK.id).messagesMatching((from, to, message) ->
                                                                                                           {
                                                                                                               if (signalled.compareAndSet(false, true))
                                                                                                               {
                                                                                                                   timeToShutdown.signalAll();
                                                                                                                   await(waitForShutdown);
                                                                                                                   return false;
                                                                                                               }
                                                                                                               return true;
                                                                                                           }).drop();
  
              sleep(10000); // wait for gossip to exchange a few messages
              f.get();
          }
          finally
          {
              es.shutdown();
          }
      }
  
      private static void await(Condition sc)
      {
          try
          {
              sc.await();
          }
          catch (InterruptedException e)
          {
              throw new RuntimeException(e);
          }
      }
  
      private static class EPChanges implements IEndpointStateChangeSubscriber, Serializable
      {
          private volatile boolean wasDead = false;
          public void onAlive(InetAddressAndPort endpoint, EndpointState state)
          {
              if (wasDead)
                  throw new RuntimeException("Node should not go live after it has been dead.");
          }
          public void onDead(InetAddressAndPort endpoint, EndpointState state)
          {
              wasDead = true;
          }
      };
  }
  