001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.mapreduce.lib.join;
020
021import java.io.IOException;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025import org.apache.hadoop.io.Writable;
026import org.apache.hadoop.io.WritableComparable;
027import org.apache.hadoop.mapreduce.InputFormat;
028import org.apache.hadoop.mapreduce.InputSplit;
029import org.apache.hadoop.mapreduce.TaskAttemptContext;
030
031/**
032 * Refinement of InputFormat requiring implementors to provide
033 * ComposableRecordReader instead of RecordReader.
034 */
035@InterfaceAudience.Public
036@InterfaceStability.Stable
037public abstract class ComposableInputFormat<K extends WritableComparable<?>,
038                                            V extends Writable>
039    extends InputFormat<K,V> {
040
041  public abstract ComposableRecordReader<K,V> createRecordReader(
042    InputSplit split, TaskAttemptContext context) 
043    throws IOException, InterruptedException;
044
045}