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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.
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  package org.apache.cassandra.distributed.test;
  
  import java.net.InetSocketAddress;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.List;
  import java.util.Objects;
  import java.util.concurrent.CopyOnWriteArrayList;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Assert;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  
  import com.datastax.driver.core.Host;
  import com.datastax.driver.core.Session;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.distributed.impl.INodeProvisionStrategy.Strategy;
  import org.apache.cassandra.distributed.test.TopologyChangeTest.EventStateListener.Event;
  
  import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
  import static org.apache.cassandra.distributed.api.Feature.NATIVE_PROTOCOL;
  import static org.apache.cassandra.distributed.api.Feature.NETWORK;
  import static org.apache.cassandra.distributed.impl.INodeProvisionStrategy.Strategy.MultipleNetworkInterfaces;
  import static org.apache.cassandra.distributed.impl.INodeProvisionStrategy.Strategy.OneNetworkInterface;
  import static org.apache.cassandra.distributed.test.TopologyChangeTest.EventStateListener.EventType.Down;
  import static org.apache.cassandra.distributed.test.TopologyChangeTest.EventStateListener.EventType.Remove;
  import static org.apache.cassandra.distributed.test.TopologyChangeTest.EventStateListener.EventType.Up;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.awaitility.Awaitility.await;
  
  @RunWith(Parameterized.class)
  public class TopologyChangeTest extends TestBaseImpl
  {
      static class EventStateListener implements Host.StateListener
      {
          enum EventType
          {
              Add,
              Up,
              Down,
              Remove,
          }
  
          static class Event
          {
              InetSocketAddress host;
              EventType type;
  
              Event(EventType type, Host host)
              {
                  this.type = type;
                  this.host = host.getBroadcastSocketAddress();
              }
  
              public Event(EventType type, IInvokableInstance iInvokableInstance)
              {
                  this.type = type;
                  this.host = iInvokableInstance.broadcastAddress();
              }
  
  
              public String toString()
              {
                  return "Event{" +
                         "host='" + host + '\'' +
                         ", type=" + type +
                         '}';
              }
  
              public boolean equals(Object o)
              {
                  if (this == o) return true;
                  if (o == null || getClass() != o.getClass()) return false;
                  Event event = (Event) o;
                  return Objects.equals(host, event.host) &&
                         type == event.type;
              }
  
              public int hashCode()
              {
                  return Objects.hash(host, type);
              }
          }
  
          private final List<Event> events = new CopyOnWriteArrayList<>();
  
          public void onAdd(Host host)
          {
              events.add(new Event(EventType.Add, host));
          }
  
          public void onUp(Host host)
          {
              events.add(new Event(Up, host));
          }
  
          public void onDown(Host host)
          {
              events.add(new Event(EventType.Down, host));
          }
  
          public void onRemove(Host host)
          {
              events.add(new Event(Remove, host));
          }
  
          public void onRegister(com.datastax.driver.core.Cluster cluster)
          {
          }
  
          public void onUnregister(com.datastax.driver.core.Cluster cluster)
          {
          }
      }
  
      @Parameterized.Parameter(0)
      public Strategy strategy;
  
      @Parameterized.Parameters(name = "{index}: provision strategy={0}")
      public static Collection<Strategy[]> data()
      {
          return Arrays.asList(new Strategy[][]{ { MultipleNetworkInterfaces },
                                                 { OneNetworkInterface }
          });
      }
  
      @Test
      public void testDecommission() throws Throwable
      {
          try (Cluster control = init(Cluster.build().withNodes(3).withNodeProvisionStrategy(strategy)
                                             .withConfig(config -> config.with(GOSSIP, NETWORK, NATIVE_PROTOCOL)).start());
               com.datastax.driver.core.Cluster cluster = com.datastax.driver.core.Cluster.builder().addContactPoint("127.0.0.1").build();
               Session session = cluster.connect())
          {
              EventStateListener eventStateListener = new EventStateListener();
              session.getCluster().register(eventStateListener);
  
              control.get(3).nodetoolResult("disablebinary").asserts().success();
              control.get(3).nodetoolResult("decommission", "-f").asserts().success();
              await().atMost(5, TimeUnit.SECONDS)
                     .untilAsserted(() -> Assert.assertEquals(2, cluster.getMetadata().getAllHosts().size()));
              session.getCluster().unregister(eventStateListener);
              // DOWN UP can also be seen if the jvm is slow and connections are closed; to avoid this make sure to use
              // containsSequence to check that down/remove happen in this order
              assertThat(eventStateListener.events).containsSequence(new Event(Down, control.get(3)), new Event(Remove, control.get(3)));
          }
      }
  
      @Test
      public void testRestartNode() throws Throwable
      {
          try (Cluster control = init(Cluster.build().withNodes(3).withNodeProvisionStrategy(strategy)
                                             .withConfig(config -> config.with(GOSSIP, NETWORK, NATIVE_PROTOCOL)).start());
               com.datastax.driver.core.Cluster cluster = com.datastax.driver.core.Cluster.builder().addContactPoint("127.0.0.1").build();
               Session session = cluster.connect())
          {
              EventStateListener eventStateListener = new EventStateListener();
              session.getCluster().register(eventStateListener);
  
              control.get(3).shutdown().get();
              await().atMost(5, TimeUnit.SECONDS)
                     .untilAsserted(() -> Assert.assertEquals(2, cluster.getMetadata().getAllHosts().stream().filter(h -> h.isUp()).count()));
  
              control.get(3).startup();
              await().atMost(30, TimeUnit.SECONDS)
                     .untilAsserted(() -> Assert.assertEquals(3, cluster.getMetadata().getAllHosts().stream().filter(h -> h.isUp()).count()));
  
              // DOWN UP can also be seen if the jvm is slow and connections are closed, but make sure it at least happens once
              // given the node restarts
              assertThat(eventStateListener.events).containsSequence(new Event(Down, control.get(3)),
                                                                     new Event(Up, control.get(3)));
          }
      }
  }
  
  