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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
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   * 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
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   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.distributed.test;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.ICluster;
  import org.apache.cassandra.distributed.api.IInstance;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.distributed.shared.NetworkTopology;
  
  import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
  import static org.apache.cassandra.distributed.api.Feature.NETWORK;
  
  // TODO: this test should be removed after running in-jvm dtests is set up via the shared API repository
  public class NetworkTopologyTest extends TestBaseImpl
  {
      @Test
      public void namedDcTest() throws Throwable
      {
          try (ICluster<IInvokableInstance> cluster = builder()
                                                      .withNodeIdTopology(Collections.singletonMap(1, NetworkTopology.dcAndRack("somewhere", "rack0")))
                                                      .withRack("elsewhere", "firstrack", 1)
                                                      .withRack("elsewhere", "secondrack", 2)
                                                      .withDC("nearthere", 4)
                                                      .createWithoutStarting())
          {
              Assert.assertEquals(1, cluster.stream("somewhere").count());
              Assert.assertEquals(1, cluster.stream("elsewhere", "firstrack").count());
              Assert.assertEquals(2, cluster.stream("elsewhere", "secondrack").count());
              Assert.assertEquals(3, cluster.stream("elsewhere").count());
              Assert.assertEquals(4, cluster.stream("nearthere").count());
  
              Set<IInstance> expect = cluster.stream().collect(Collectors.toSet());
              Set<IInstance> result = Stream.concat(Stream.concat(cluster.stream("somewhere"),
                                                                  cluster.stream("elsewhere")),
                                                    cluster.stream("nearthere")).collect(Collectors.toSet());
              Assert.assertEquals(expect, result);
          }
      }
  
      @Test
      public void automaticNamedDcTest() throws Throwable
  
      {
          try (ICluster cluster = builder().withRacks(2, 1, 3)
                                           .createWithoutStarting())
          {
              Assert.assertEquals(6, cluster.stream().count());
              Assert.assertEquals(3, cluster.stream("datacenter1").count());
              Assert.assertEquals(3, cluster.stream("datacenter2", "rack1").count());
          }
      }
  
      @Test(expected = IllegalStateException.class)
      public void noCountsAfterNamingDCsTest() throws IOException
      {
          builder().withDC("nameddc", 1)
                   .withDCs(1)
                   .createWithoutStarting();
      }
  
      @Test(expected = IllegalStateException.class)
      public void mustProvideNodeCountBeforeWithDCsTest() throws IOException
      {
          builder().withDCs(1)
                   .createWithoutStarting();
      }
  
      @Test(expected = IllegalStateException.class)
      public void noEmptyNodeIdTopologyTest()
      {
          builder().withNodeIdTopology(Collections.emptyMap());
      }
  
      @Test(expected = IllegalStateException.class)
      public void noHolesInNodeIdTopologyTest()
      {
          builder().withNodeIdTopology(Collections.singletonMap(2, NetworkTopology.dcAndRack("doomed", "rack")));
      }
  
      @Test
      public void noWarningForNetworkTopologyStategyConfigOnRestart() throws Exception {
          int nodesPerDc = 2;
          try (Cluster cluster = builder().withConfig(c -> c.with(GOSSIP, NETWORK))
                                          .withRacks(2, 1, nodesPerDc)
                                          .start()) {
              cluster.schemaChange("CREATE KEYSPACE " + KEYSPACE +
                                   " WITH replication = {'class': 'NetworkTopologyStrategy', " +
                                   "'datacenter1' : " + nodesPerDc + ", 'datacenter2' : " + nodesPerDc + " };");
              cluster.get(2).nodetool("flush");
              // Stop node 2 in datacenter 1
              cluster.get(2).shutdown().get();
              // Restart node 2 in datacenter 1
              cluster.get(2).startup();
              List<String> result = cluster.get(2).logs().grep("Ignoring Unrecognized strategy option \\{datacenter2\\}").getResult();
              Assert.assertTrue("Not expected to see the warning about unrecognized option", result.isEmpty());
          }
      }
  }
  