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.worker.block.meta;
  
  import alluxio.worker.block.BlockMetadataEvictorView;
  
  import com.google.common.base.Preconditions;
  
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * This class is a wrapper of {@link StorageTier} to provide more limited access for evictors.
   */
  @ThreadSafe
  public class StorageTierEvictorView extends StorageTierView {
  
    /** The {@link BlockMetadataEvictorView} this {@link StorageTierEvictorView} is under. */
    private final BlockMetadataEvictorView mMetadataView;
  
    /**
     * Creates a {@link StorageTierEvictorView} using the actual {@link StorageTier} and the above
     * {@link BlockMetadataEvictorView}.
     *
     * @param tier which the tierView is constructed from
     * @param view the {@link BlockMetadataEvictorView} this tierView is associated with
     */
    public StorageTierEvictorView(StorageTier tier, BlockMetadataEvictorView view) {
      super(tier);
      mMetadataView = Preconditions.checkNotNull(view, "view");
  
      for (StorageDir dir : mTier.getStorageDirs()) {
        StorageDirEvictorView dirView = new StorageDirEvictorView(dir, this, view);
        mDirViews.put(dirView.getDirViewIndex(), dirView);
      }
    }
  
    /**
     * @return the block metadata evictor view for this storage tier view
     */
    public BlockMetadataEvictorView getBlockMetadataEvictorView() {
      return mMetadataView;
    }
  }
  