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   * Licensed to the Apache Software Foundation (ASF) under one
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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.tcm.ownership;
  
  import java.util.List;
  import java.util.Set;
  
  import org.apache.cassandra.dht.Range;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.schema.Keyspaces;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.Epoch;
  import org.apache.cassandra.tcm.membership.NodeId;
  
  public interface PlacementProvider
  {
      DataPlacements calculatePlacements(Epoch epoch, List<Range<Token>> ranges, ClusterMetadata metadata, Keyspaces keyspaces);
      // TODO naming
      PlacementTransitionPlan planForJoin(ClusterMetadata metadata,
                                          NodeId joining,
                                          Set<Token> tokens,
                                          Keyspaces keyspaces);
  
      PlacementTransitionPlan planForMove(ClusterMetadata metadata,
                                          NodeId nodeId,
                                          Set<Token> tokens,
                                          Keyspaces keyspaces);
  
      // TODO: maybe leave, for consistency?
      PlacementTransitionPlan planForDecommission(ClusterMetadata metadata,
                                                  NodeId nodeId,
                                                  Keyspaces keyspaces);
  
      PlacementTransitionPlan planForReplacement(ClusterMetadata metadata,
                                                 NodeId replaced,
                                                 NodeId replacement,
                                                 Keyspaces keyspaces);
  }
  