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.io;
  
  import alluxio.worker.block.BlockStoreLocation;
  
  /**
   * An interface to listen for creation and destruction of block clients.
   */
  public interface BlockClientListener {
  
    /**
     * Called when a new block client is opened.
     *
     * @param blockClient the block read/write client
     * @param location the block location
     */
    void clientOpened(BlockClient blockClient, BlockStoreLocation location);
  
    /**
     * Called when an open block client is closed.
     *
     * @param blockClient the block read/write client
     * @param location the block location
     */
    void clientClosed(BlockClient blockClient, BlockStoreLocation location);
  }
  