content: /*
   * Licensed to the Apache Softwarea 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.tcm.transformations;
  
  import java.io.IOException;
  import java.util.EnumSet;
  
  import com.google.common.annotations.VisibleForTesting;
  
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.ClusterMetadataService;
  import org.apache.cassandra.tcm.Transformation;
  import org.apache.cassandra.tcm.membership.NodeId;
  import org.apache.cassandra.tcm.membership.NodeState;
  import org.apache.cassandra.tcm.ownership.DataPlacements;
  import org.apache.cassandra.tcm.ownership.PlacementProvider;
  import org.apache.cassandra.tcm.sequences.LockedRanges;
  import org.apache.cassandra.tcm.serialization.AsymmetricMetadataSerializer;
  import org.apache.cassandra.tcm.serialization.Version;
  
  import static org.apache.cassandra.exceptions.ExceptionCode.INVALID;
  
  public class Unregister implements Transformation
  {
      public static final Serializer serializer = new Serializer();
  
      private final NodeId nodeId;
      private final EnumSet<NodeState> allowedNodeStartStates;
      private final PlacementProvider placementProvider;
  
      public Unregister(NodeId nodeId, EnumSet<NodeState> allowedNodeStartStates, PlacementProvider placementProvider)
      {
          this.nodeId = nodeId;
          this.allowedNodeStartStates = allowedNodeStartStates;
          this.placementProvider = placementProvider;
      }
  
      @Override
      public Kind kind()
      {
          return Kind.UNREGISTER;
      }
  
      @Override
      public Result execute(ClusterMetadata prev)
      {
          if (!prev.directory.peerIds().contains(nodeId))
              return new Rejected(INVALID, String.format("Can not unregister %s since it is not present in the directory.", nodeId));
  
          NodeState startState = prev.directory.peerState(nodeId);
          if (!allowedNodeStartStates.contains(startState))
              return new Transformation.Rejected(INVALID, "Can't unregister " + nodeId + " - node state is " + startState + " not " + allowedNodeStartStates);
  
          ClusterMetadata.Transformer next = prev.transformer().unregister(nodeId);
          if (!prev.tokenMap.tokens(nodeId).isEmpty())
          {
              ClusterMetadata nextMetadata = next.build().metadata;
              DataPlacements placements = placementProvider.calculatePlacements(nextMetadata.epoch,
                                                                                nextMetadata.tokenMap.toRanges(),
                                                                                nextMetadata,
                                                                                nextMetadata.schema.getKeyspaces());
              next = next.with(placements);
          }
  
          return Transformation.success(next, LockedRanges.AffectedRanges.EMPTY);
      }
  
      /**
       * unsafe, only for test use
       */
      @VisibleForTesting
      public static void unregister(NodeId nodeId)
      {
          ClusterMetadataService.instance()
                                .commit(new Unregister(nodeId, EnumSet.allOf(NodeState.class), ClusterMetadataService.instance().placementProvider()));
      }
  
      public String toString()
      {
          return "Unregister{" +
                 ", nodeId=" + nodeId +
                 '}';
      }
  
      static class Serializer implements AsymmetricMetadataSerializer<Transformation, Unregister>
      {
          public void serialize(Transformation t, DataOutputPlus out, Version version) throws IOException
          {
              assert t instanceof Unregister;
              Unregister register = (Unregister)t;
              if (version.isAtLeast(Version.V2))
              {
                  out.writeUnsignedVInt32(register.allowedNodeStartStates.size());
                  for (NodeState allowedState : register.allowedNodeStartStates)
                      out.writeUTF(allowedState.name());
              }
              NodeId.serializer.serialize(register.nodeId, out, version);
          }
  
          public Unregister deserialize(DataInputPlus in, Version version) throws IOException
          {
              EnumSet<NodeState> states = EnumSet.noneOf(NodeState.class);
              if (version.isAtLeast(Version.V2))
              {
                  int startStateSize = in.readUnsignedVInt32();
                  for (int i = 0; i < startStateSize; i++)
                      states.add(NodeState.valueOf(in.readUTF()));
              }
              NodeId nodeId = NodeId.serializer.deserialize(in, version);
              return new Unregister(nodeId, version.isAtLeast(Version.V2) ? states : EnumSet.allOf(NodeState.class), ClusterMetadataService.instance().placementProvider());
          }
  
          public long serializedSize(Transformation t, Version version)
          {
              assert t instanceof Unregister;
              Unregister unregister = (Unregister) t;
              long size = 0;
              if (version.isAtLeast(Version.V2))
              {
                  size += TypeSizes.sizeofUnsignedVInt(unregister.allowedNodeStartStates.size());
                  for (NodeState state : unregister.allowedNodeStartStates)
                      size += TypeSizes.sizeof(state.name());
              }
              size += NodeId.serializer.serializedSize(unregister.nodeId, version);
              return size;
          }
      }
  }
  