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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.transport;
  
  import java.util.Collections;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.service.StorageService;
  import org.apache.cassandra.transport.messages.RegisterMessage;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static org.junit.Assert.assertEquals;
  
  @RunWith(Parameterized.class)
  public class ClientNotificiationsTest extends CQLTester
  {
      private static Server.EventNotifier notifier = new Server.EventNotifier();
  
      @Before
      public void setup()
      {
          requireNetwork(builder -> builder.withEventNotifier(notifier), builder -> {});
      }
  
      @Parameterized.Parameter(0)
      public ProtocolVersion version;
  
      @Parameterized.Parameters(name = "{index}: protocol version={0}")
      public static Iterable<ProtocolVersion> params()
      {
          return ProtocolVersion.SUPPORTED;
      }
  
      @Test
      public void testNotifications() throws Exception
      {
          SimpleClient.Builder builder = SimpleClient.builder(nativeAddr.getHostAddress(), nativePort)
                                                     .protocolVersion(version);
          if (version.isBeta())
              builder.useBeta();
  
          try (SimpleClient client = builder.build())
          {
              EventHandler handler = new EventHandler();
              client.setEventHandler(handler);
              client.connect(false);
              client.execute(new RegisterMessage(Collections.singletonList(Event.Type.STATUS_CHANGE)));
              client.execute(new RegisterMessage(Collections.singletonList(Event.Type.TOPOLOGY_CHANGE)));
              client.execute(new RegisterMessage(Collections.singletonList(Event.Type.SCHEMA_CHANGE)));
  
              InetAddressAndPort broadcastAddress = FBUtilities.getBroadcastAddressAndPort();
              InetAddressAndPort nativeAddress = FBUtilities.getBroadcastNativeAddressAndPort();
              KeyspaceMetadata ks = KeyspaceMetadata.create("ks", KeyspaceParams.simple(1));
  
              // Necessary or else the NEW_NODE notification is deferred (CASSANDRA-11038)
              // (note: this works because the notifications are for the local address)
              StorageService.instance.setRpcReady(true);
  
              notifier.onUp(broadcastAddress);
              notifier.onDown(broadcastAddress);
              notifier.onJoinCluster(broadcastAddress);
              notifier.onMove(broadcastAddress);
              notifier.onLeaveCluster(broadcastAddress);
              notifier.onCreateKeyspace(ks);
              notifier.onAlterKeyspace(ks, ks);
              notifier.onDropKeyspace(ks, true);
  
              handler.assertNextEvent(Event.StatusChange.nodeUp(nativeAddress));
              handler.assertNextEvent(Event.StatusChange.nodeDown(nativeAddress));
              handler.assertNextEvent(Event.TopologyChange.newNode(nativeAddress));
              handler.assertNextEvent(Event.TopologyChange.movedNode(nativeAddress));
              handler.assertNextEvent(Event.TopologyChange.removedNode(nativeAddress));
              handler.assertNextEvent(new Event.SchemaChange(Event.SchemaChange.Change.CREATED, "ks"));
              handler.assertNextEvent(new Event.SchemaChange(Event.SchemaChange.Change.UPDATED, "ks"));
              handler.assertNextEvent(new Event.SchemaChange(Event.SchemaChange.Change.DROPPED, "ks"));
          }
      }
  
      static class EventHandler extends SimpleClient.SimpleEventHandler
      {
          public void assertNextEvent(Event expected)
          {
              try
              {
                  Event actual = queue.poll(100, TimeUnit.MILLISECONDS);
                  assertEquals(expected, actual);
              }
              catch (InterruptedException e)
              {
                  throw new AssertionError(String.format("Expected event %s, but not received withing timeout", expected));
              }
          }
      }
  }
  