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Apache Hadoop Common

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/**
 * 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.util;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * A facility for reporting progress.
 * 
 * Clients and/or applications can use the provided Progressable
 * to explicitly report progress to the Hadoop framework. This is especially
 * important for operations which take significant amount of time since,
 * in-lieu of the reported progress, the framework has to assume that an error
 * has occurred and time-out the operation.
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public interface Progressable {
  /**
   * Report progress to the Hadoop framework.
   */
  public void progress();
}