/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hdds.utils;

/**
 * Result of a {@link BackgroundTask}.
 */
public interface BackgroundTaskResult {

  /**
   * Returns the size of entries included in this result.
   */
  int getSize();

  /**
   * An empty task result implementation.
   */
  class EmptyTaskResult implements BackgroundTaskResult {

    public static EmptyTaskResult newResult() {
      return new EmptyTaskResult();
    }

    @Override
    public int getSize() {
      return 0;
    }
  }
}
