code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.sdk.client.subscriptions;
  
  import java.util.Optional;
  
  import org.eclipse.milo.opcua.stack.core.types.builtin.StatusCode;
  
  
  /**
   * Holds the operation- and service-level results of a batch operation.
   *
   * @param <T> the type of the operation result for the batch operation.
   */
  public interface BatchItemResult<T> {
  
      /**
       * The service-level result of service call the batch item was part of.
       *
       * @return the service-level result of service call the batch item was part of.
       */
      StatusCode serviceResult();
  
      /**
       * The operation-level result of the batch operation.
       * <p>
       * May not be present if the service result is not good.
       *
       * @return the operation-level result of the batch operation.
       * @see #serviceResult()
       * @see StatusCode#isGood()
       */
      Optional<T> operationResult();
  
  }
  