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.cli.hms;
  
  import alluxio.cli.AbstractValidationTask;
  import alluxio.cli.ValidationTaskResult;
  import alluxio.collections.Pair;
  
  import java.util.Map;
  import javax.annotation.Nullable;
  
  /**
   * A validation task which includes extra information in order to provide dependencies for
   * sub-tasks along with the task's validation result.
   *
   * @param <K> The input type of this task
   * @param <T> the output type of this task
   */
  public abstract class MetastoreValidationTask<K, T> extends AbstractValidationTask {
  
    @Nullable
    protected final MetastoreValidationTask<?, K> mInputTask;
  
    /**
     * Create a new {@link MetastoreValidationTask} with the given input task. The input task may
     * be null if the validation is not a subtask.
     *
     * @param inputTask a pre-requisite task which must run before this task
     */
    public MetastoreValidationTask(@Nullable MetastoreValidationTask<?, K> inputTask) {
      mInputTask = inputTask;
    }
  
    /**
     * @return a result of the validation. If {@link Pair#getFirst()} has a state of
     * {@link alluxio.cli.ValidationUtils.State#OK}, then {@link Pair#getSecond()} will be non-null
     */
    abstract Pair<ValidationTaskResult, T> getValidationWithResult() throws InterruptedException;
  
    @Override
    public ValidationTaskResult validateImpl(Map<String, String> optionMap)
        throws InterruptedException {
      return getValidationWithResult().getFirst();
    }
  }
  