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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
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  package org.apache.cassandra.db.view;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.CassandraTestBase;
  import org.apache.cassandra.CassandraTestBase.DDDaemonInitialization;
  import org.apache.cassandra.CassandraTestBase.UseOrderPreservingPartitioner;
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.dht.OrderPreservingPartitioner.StringToken;
  import org.apache.cassandra.distributed.test.log.ClusterMetadataTestHelper;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.locator.NetworkTopologyStrategy;
  import org.apache.cassandra.locator.Replica;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.ReplicationParams;
  import org.apache.cassandra.schema.SchemaTestUtil;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.ClusterMetadataService;
  import org.apache.cassandra.tcm.StubClusterMetadataService;
  
  @DDDaemonInitialization
  @UseOrderPreservingPartitioner
  public class ViewUtilsTest extends CassandraTestBase
  {
      private final String KS = "Keyspace1";
  
      @BeforeClass
      public static void setUp() throws ConfigurationException, IOException
      {
          ServerTestUtils.cleanupAndLeaveDirs();
          Keyspace.setInitialized();
      }
  
      @Before
      public void beforeEach()
      {
          ClusterMetadataService.unsetInstance();
          ClusterMetadataService.setInstance(StubClusterMetadataService.forTesting());
      }
  
      @Test
      public void testGetIndexNaturalEndpoint() throws Exception
      {
          // DC1
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.1"), new StringToken("A"), "DC1", "RACK1");
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.2"), new StringToken("C"), "DC1", "RACK1");
  
          // DC2
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.4"), new StringToken("B"), "DC2", "RACK1");
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.5"), new StringToken("D"), "DC2", "RACK1");
  
  
          Map<String, String> replicationMap = new HashMap<>();
          replicationMap.put(ReplicationParams.CLASS, NetworkTopologyStrategy.class.getName());
  
          replicationMap.put("DC1", "1");
          replicationMap.put("DC2", "1");
  
          recreateKeyspace(replicationMap);
  
          Optional<Replica> naturalEndpoint = ViewUtils.getViewNaturalEndpoint(ClusterMetadata.current(),
                                                                               KS,
                                                                               new StringToken("CA"),
                                                                               new StringToken("BB"));
  
          Assert.assertTrue(naturalEndpoint.isPresent());
          Assert.assertEquals(InetAddressAndPort.getByName("127.0.0.2"), naturalEndpoint.get().endpoint());
      }
  
  
      @Test
      public void testLocalHostPreference() throws Exception
      {
          // DC1
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.1"), new StringToken("A"), "DC1", "RACK1");
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.2"), new StringToken("C"), "DC1", "RACK1");
  
          // DC2
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.4"), new StringToken("B"), "DC2", "RACK1");
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.5"), new StringToken("D"), "DC2", "RACK1");
  
          Map<String, String> replicationMap = new HashMap<>();
          replicationMap.put(ReplicationParams.CLASS, NetworkTopologyStrategy.class.getName());
  
          replicationMap.put("DC1", "2");
          replicationMap.put("DC2", "2");
  
          recreateKeyspace(replicationMap);
  
          Optional<Replica> naturalEndpoint = ViewUtils.getViewNaturalEndpoint(ClusterMetadata.current(),
                                                                               KS,
                                                                               new StringToken("CA"),
                                                                               new StringToken("BB"));
  
          Assert.assertTrue(naturalEndpoint.isPresent());
          Assert.assertEquals(InetAddressAndPort.getByName("127.0.0.1"), naturalEndpoint.get().endpoint());
      }
  
      @Test
      public void testBaseTokenDoesNotBelongToLocalReplicaShouldReturnEmpty() throws Exception
      {
          // DC1
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.1"), new StringToken("A"), "DC1", "RACK1");
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.2"), new StringToken("C"), "DC1", "RACK1");
  
          // DC2
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.4"), new StringToken("B"), "DC2", "RACK1");
          ClusterMetadataTestHelper.addEndpoint(InetAddressAndPort.getByName("127.0.0.5"), new StringToken("D"), "DC2", "RACK1");
  
  
          Map<String, String> replicationMap = new HashMap<>();
          replicationMap.put(ReplicationParams.CLASS, NetworkTopologyStrategy.class.getName());
  
          replicationMap.put("DC1", "1");
          replicationMap.put("DC2", "1");
  
          recreateKeyspace(replicationMap);
  
          Optional<Replica> naturalEndpoint = ViewUtils.getViewNaturalEndpoint(ClusterMetadata.current(),
                                                                               KS,
                                                                               new StringToken("AB"),
                                                                               new StringToken("BB"));
  
          Assert.assertFalse(naturalEndpoint.isPresent());
      }
  
      private void recreateKeyspace(Map<String, String> replicationMap)
      {
          SchemaTestUtil.dropKeyspaceIfExist(KS, true);
          KeyspaceMetadata meta = KeyspaceMetadata.create(KS, KeyspaceParams.create(false, replicationMap));
          SchemaTestUtil.addOrUpdateKeyspace(meta, true);
      }
  }
  