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.client.file.cache.allocator;
  
  import alluxio.client.file.cache.store.PageStoreDir;
  
  import java.util.List;
  import java.util.function.Function;
  
  /**
   * Offers stickiness allocation based on the file id.
   */
  public class AffinityHashAllocator extends HashAllocator {
  
    /**
     * @param dirs page store directories
     */
    public AffinityHashAllocator(List<PageStoreDir> dirs) {
      super(dirs);
    }
  
    /**
     * @param dirs page store directories
     * @param hashFunction hash function
     */
    public AffinityHashAllocator(List<PageStoreDir> dirs, Function<String, Integer> hashFunction) {
      super(dirs, hashFunction);
    }
  
    @Override
    public PageStoreDir allocate(String fileId, long fileLength) {
      for (PageStoreDir dir : mDirs) {
        if (dir.hasFile(fileId) || dir.hasTempFile(fileId)) {
          return dir;
        }
      }
      return super.allocate(fileId, fileLength);
    }
  }
  