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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
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  package org.apache.cassandra.tcm;
  
  import java.util.EnumSet;
  import java.util.function.BiFunction;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.collect.Sets;
  import com.google.common.collect.Streams;
  import org.junit.Test;
  
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.schema.DistributedMetadataLogKeyspace;
  import org.apache.cassandra.schema.DistributedSchema;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.Keyspaces;
  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.membership.NodeState;
  import org.apache.cassandra.tcm.membership.NodeVersion;
  import org.apache.cassandra.tcm.ownership.UniformRangePlacement;
  import org.apache.cassandra.tcm.transformations.Assassinate;
  import org.apache.cassandra.tcm.transformations.Register;
  import org.apache.cassandra.tcm.transformations.Unregister;
  import org.apache.cassandra.tcm.transformations.UnsafeJoin;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNull;
  
  public class UnregisterTest
  {
      private final KeyspaceMetadata ksm = KeyspaceMetadata.create("ks_nts", KeyspaceParams.nts("dc1", 3, "dc2", 3));
      private final Keyspaces kss = Keyspaces.of(DistributedMetadataLogKeyspace.initialMetadata(Sets.newHashSet("dc1", "dc2")), ksm);
      private final DistributedSchema initialSchema = new DistributedSchema(kss);
  
      @Test
      public void testBasicUnregister()
      {
          unregisterHelper((toUnregister, metadata) -> {
              metadata = assassinate(toUnregister, metadata);
              metadata = unregister(toUnregister, metadata);
              return metadata;
          });
      }
  
      @Test
      public void badStateUnregister()
      {
          unregisterHelper((toUnregister, metadata) -> {
              metadata = left(toUnregister, metadata);
              metadata = unregister(toUnregister, metadata);
              return metadata;
          });
      }
  
      private void unregisterHelper(BiFunction<Integer, ClusterMetadata, ClusterMetadata> f)
      {
          ClusterMetadata metadata = new ClusterMetadata(Murmur3Partitioner.instance, Directory.EMPTY, initialSchema);
  
          int toUnregister = 5;
          for (int i = 0; i < 10; i++)
          {
              // node we're unregistering is only node in dc2 - make sure the dc is gone after unregistration
              String dc = "dc"+(i == toUnregister ? "2" :"1");
              metadata = unsafejoin(i, register(i, dc, metadata));
          }
          Token t = token(toUnregister, metadata);
          InetAddressAndPort ep = ep(toUnregister);
          NodeId nodeId = metadata.directory.peerId(ep(toUnregister));
          metadata = f.apply(toUnregister, metadata);
          assertNoTrace(ep, nodeId, t, metadata);
      }
  
      private ClusterMetadata left(int i, ClusterMetadata metadata)
      {
          NodeId nodeId = metadata.directory.peerId(ep(i));
          ClusterMetadata.Transformer t = metadata.transformer().withNodeState(nodeId, NodeState.LEFT);
          return t.build().metadata;
      }
  
      private static void assertNoTrace(InetAddressAndPort ep, NodeId nodeId, Token t, ClusterMetadata metadata)
      {
          assertNull(metadata.tokenMap.owner(t));
          assertFalse(metadata.directory.states.containsKey(nodeId));
          assertFalse(metadata.directory.peerIds().contains(nodeId));
          assertFalse(metadata.directory.allAddresses().contains(ep));
          assertFalse(metadata.directory.allJoinedEndpoints().contains(ep));
          assertFalse(metadata.directory.allDatacenterRacks().containsKey("dc2"));
          assertFalse(metadata.directory.knownDatacenters().contains("dc2"));
          metadata.placements.asMap().forEach((params, placement) -> {
              assertFalse(Streams.concat(placement.writes.endpoints.stream(), placement.reads.endpoints.stream()).anyMatch((fr) -> fr.endpoints().contains(ep)));
          });
      }
  
      private Token token(int i, ClusterMetadata metadata)
      {
          NodeId nodeId = metadata.directory.peerId(ep(i));
          return metadata.tokenMap.tokens(nodeId).iterator().next();
      }
  
      private ClusterMetadata assassinate(int i, ClusterMetadata metadata)
      {
          return new Assassinate(metadata.directory.peerId(ep(i)), new UniformRangePlacement()).execute(metadata).success().metadata;
      }
  
      private ClusterMetadata unregister(int i, ClusterMetadata metadata )
      {
          return new Unregister(metadata.directory.peerId(ep(i)), EnumSet.of(NodeState.LEFT), new UniformRangePlacement()).execute(metadata).success().metadata;
      }
  
      private ClusterMetadata register(int i, String dc, ClusterMetadata metadata)
      {
          return new Register(new NodeAddresses(ep(i)), new Location(dc, "rack1"), NodeVersion.CURRENT).execute(metadata).success().metadata;
      }
  
      private ClusterMetadata unsafejoin(int i, ClusterMetadata metadata)
      {
          NodeId nodeId = metadata.directory.peerId(ep(i));
          return new UnsafeJoin(nodeId, ImmutableSet.of(Murmur3Partitioner.instance.getRandomToken()), new UniformRangePlacement()).execute(metadata).success().metadata;
      }
  
      private InetAddressAndPort ep(int i)
      {
          return InetAddressAndPort.getByNameUnchecked("127.0.0."+i);
      }
  }
  