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.scheduler.job;
  
  import alluxio.client.block.stream.BlockWorkerClient;
  
  import com.google.common.util.concurrent.ListenableFuture;
  
  /**
   * A task that can be executed on a worker. Belongs to a {@link Job}.
   *
   * @param <V> the response type of the task
   */
  public abstract class Task<V> {
  
    /**
     * run the task.
     */
    protected abstract ListenableFuture<V> run(BlockWorkerClient client);
  
    private ListenableFuture<V> mResponseFuture;
  
    /**
     * @return the response future
     */
    public ListenableFuture<V> getResponseFuture() {
      return mResponseFuture;
    }
  
    /**
     * run the task and set the response future.
     * @param client worker client
     */
    public void execute(BlockWorkerClient client) {
      mResponseFuture = run(client);
    }
  }
  