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.locator;
  
  import java.net.UnknownHostException;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import com.google.common.collect.ImmutableMap;
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.schema.DistributedSchema;
  import org.apache.cassandra.service.accord.AccordFastPath;
  import org.apache.cassandra.service.accord.AccordStaleReplicas;
  import org.apache.cassandra.service.consensus.migration.ConsensusMigrationState;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.Epoch;
  import org.apache.cassandra.tcm.membership.Directory;
  import org.apache.cassandra.tcm.membership.Location;
  import org.apache.cassandra.tcm.membership.NodeAddresses;
  import org.apache.cassandra.tcm.membership.NodeId;
  import org.apache.cassandra.tcm.ownership.DataPlacements;
  import org.apache.cassandra.tcm.ownership.TokenMap;
  import org.apache.cassandra.tcm.sequences.InProgressSequences;
  import org.apache.cassandra.tcm.sequences.LockedRanges;
  
  public class MetaStrategyTest
  {
      static
      {
          DatabaseDescriptor.daemonInitialization();
          DatabaseDescriptor.setPartitionerUnsafe(Murmur3Partitioner.instance);
      }
  
      static class NodeConfiguration
      {
          final NodeAddresses addresses;
          final Location location;
          final long token;
  
          NodeConfiguration(NodeAddresses addresses, Location location, long token)
          {
              this.addresses = addresses;
              this.location = location;
              this.token = token;
          }
      }
  
      public static NodeConfiguration node(NodeAddresses addresses, Location location, long token)
      {
          return new NodeConfiguration(addresses, location, token);
      }
  
      public static ClusterMetadata metadata(NodeConfiguration... configurations)
      {
          Directory directory = new Directory();
          TokenMap tokenMap = new TokenMap(Murmur3Partitioner.instance);
          for (NodeConfiguration configuration : configurations)
          {
              directory = directory.with(configuration.addresses, configuration.location);
              directory = directory.withRackAndDC(directory.peerId(configuration.addresses.broadcastAddress));
              tokenMap = tokenMap.assignTokens(directory.peerId(configuration.addresses.broadcastAddress), Collections.singleton(new Murmur3Partitioner.LongToken(configuration.token)));
          }
  
          return new ClusterMetadata(Epoch.EMPTY,
                                     Murmur3Partitioner.instance,
                                     DistributedSchema.empty(),
                                     directory,
                                     tokenMap,
                                     DataPlacements.EMPTY,
                                     AccordFastPath.EMPTY,
                                     LockedRanges.EMPTY,
                                     InProgressSequences.EMPTY,
                                     ConsensusMigrationState.EMPTY,
                                     ImmutableMap.of(),
                                     AccordStaleReplicas.EMPTY);
      }
  
      @Test
      public void testDatacenterAware() throws Throwable
      {
          ClusterMetadata metadata = metadata(node(addr(1), location("dc1", "rack1"), 1),
                                              node(addr(2), location("dc1", "rack1"), 2),
                                              node(addr(3), location("dc1", "rack1"), 3),
                                              node(addr(4), location("dc2", "rack2"), 4),
                                              node(addr(5), location("dc2", "rack2"), 5),
                                              node(addr(6), location("dc2", "rack2"), 6),
                                              node(addr(7), location("dc3", "rack3"), 7),
                                              node(addr(8), location("dc3", "rack3"), 8),
                                              node(addr(9), location("dc3", "rack3"), 9));
  
          Map<String, Integer> rf = new HashMap<>();
          rf.put("dc1", 2);
          rf.put("dc2", 2);
          rf.put("dc3", 2);
  
          CMSPlacementStrategy placementStrategy = new CMSPlacementStrategy(rf, (cd, n) -> true);
          Assert.assertEquals(nodeIds(metadata.directory,
                                      1, 2, 4, 5, 7, 8),
                              placementStrategy.reconfigure(metadata));
  
          Assert.assertEquals(nodeIds(metadata.directory,
                                      1, 2, 4, 5, 7, 8),
                              placementStrategy.reconfigure(metadata));
  
          placementStrategy = new CMSPlacementStrategy(rf, (cd, n) -> !n.equals(metadata.directory.peerId(addr(2).broadcastAddress)) &&
                                                                      !n.equals(metadata.directory.peerId(addr(2).broadcastAddress)));
          Assert.assertEquals(nodeIds(metadata.directory,
                                      1, 3, 4, 5, 7, 8),
                              placementStrategy.reconfigure(metadata));
  
          Assert.assertEquals(nodeIds(metadata.directory,
                                      1, 3, 4, 5, 7, 8),
                              placementStrategy.reconfigure(metadata));
      }
  
      public static Set<NodeId> nodeIds(Directory directory, int... addrs) throws UnknownHostException
      {
          Set<NodeId> nodeIds = new HashSet<>();
          for (int addr : addrs)
              nodeIds.add(directory.peerId(InetAddressAndPort.getByName("127.0.0." + addr)));
          return nodeIds;
      }
  
      public static NodeAddresses addr(int i)
      {
          try
          {
              InetAddressAndPort inetAddressAndPort = InetAddressAndPort.getByName("127.0.0." + i);
              return new NodeAddresses(inetAddressAndPort);
          }
          catch (UnknownHostException e)
          {
              throw new RuntimeException(e);
          }
      }
  
      public static Location location(String dc, String rack)
      {
          return new Location(dc, rack);
      }
  }
  