content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio;
  
  import alluxio.collections.Pair;
  import alluxio.worker.block.BlockStoreLocation;
  
  import java.util.List;
  
  /**
   * A two-way mapping between storage tier aliases and ordinal numbers from configuration.
   */
  public interface StorageTierAssoc {
    /**
     * @param ordinal a storage tier ordinal
     * @return the storage tier alias matching the given ordinal
     */
    String getAlias(int ordinal);
  
    /**
     * @param alias a storage tier alias
     * @return the storage tier ordinal matching the given alias
     */
    int getOrdinal(String alias);
  
    /**
     * @return the size of the alias-ordinal mapping
     */
    int size();
  
    /**
     * @return a list of storage tier aliases in order of their ordinal value
     */
    List<String> getOrderedStorageAliases();
  
    /**
     * @return list of intersections between tier levels
     */
    List<Pair<BlockStoreLocation, BlockStoreLocation>> intersectionList();
  }
  